[中文翻译版] 见附件   原文链接： https://community.nxp.com/docs/DOC-343372 

[中文翻译版] 见附件   原文链接： https://community.nxp.com/docs/DOC-343518 

[中文翻译版] 见附件   原文链接： https://community.nxp.com/docs/DOC-343761 

This doc show: on i.MX6Q SabreSD board, configure ov5640 sensor(parallel or MIPI) output 5MP(2592x1944) RAW(Bayer) data at 15fps,and i.MX6Q IPU capture RAW RGB data, and i.MX6Q GPU debayer RAW data then display image. HW: i.MX6Q-SabreSD board, ov5640 sensor. SW: Linux 4.14.98_2.0.0 BSP, and patches in this doc. Configure at camera sensor side A Bayer filter is a color filter array (CFA) for arranging RGB color filters on a square grid of photosensors. The filter pattern is 50% green, 25% red and 25% blue, hence is also called BGGR, RGBG ,GRGB, or RGGB. The ov5640 has an image array capable of operating at up to 15 fps in 5 megapixel (2592x1944) resolution. OV5640 support output formats: RAW(Bayer), RGB565/555/444,CCIR656, YUV422/420, YCbCr422, and compression. To make ov5640 output 5MP RAW data at 15fps, check my patch imx6_ov5640_dvp_mipi_raw_capture_driver-4.14.98_2.0.0.diff which apply on i.MX Linux 4.14.98_2.0.0 BSP kernel code: Parallel interface ov5640, use ov5640_raw_setting[] array of drivers/media/platform/mxc/capture/ov5640.c. This register setting is come from ov5640 software application note and data sheet. MIPI interface ov5640, use ov5640_mipi_raw_setting[] array of drivers/media/platform/mxc/capture/ov5640_mipi.c. This register setting is combine setting of original code (remove ISP register setting), plus PLL register setting for MIPI interface, plus some data format register setting. Configure at i.MX6Q side The i.MX6Q IPU camera port(CSI-2 module) support data format include Raw(Bayer), RGB, YUV 4:4:4, YUV 4:2:2 and grayscale, up to 16 bits per value. Below is camera data routing for i.MX6Q:    Below is i.MX6Q IPU block daigram: The CSI-2 of IPU which is responsible for synchronizing and packing the video (or generic data) and sending it to other blocks. The video data received by CSI-2, could be sent to three other blocks: SMFC, VDI, IC. For RAW (Bayer) data capture, should go through path like this: CSI-2-->SMFC-->IDMAC-->DDR memory It means RAW data is received as generic data, see IPU_PIX_FMT_GENERIC in my patch, and IPU cannot process this kind data, it is just received to DDR memory. For MIPI interface camera, need note is i.MX6 side MIPI D-PHY clock must be calibrated to the actual clock range of the camera sensor’s D-PHY clock and the calibrated value must be equal to or greater than the camera sensor clock, detail see  AN5305. Take MIPI ov5640 as example: Pixel clock = 2592x1944x15fpsx(1/2 cycle/pixel)x1.35 blank interval = 51MHZ MIPI data rate = 51MHZ x 16 bit = 816Mb/s so 816/2/2*2 is 408MHZ is i.MX6 side D-PHY clock. Here due to one bayer pixel is 8bit, and i.MX6 MIPI data bus is 16 bit, so above use 1/2 cycle/pixel. And check ov5640_mipi_raw_setting[], you will got the sensor side D-PHY clock is about 672/2 = 336MHZ. And check AN5305, register MIPI_CSI2_PHY_TST_CTRL1 of i.MX6 need set as 0xC, but here i still keep it as default BSP value 0x14.   3.Capture test code I changed unit test mxc_v4l2_capture.c to capture the RAW data and save it to file. Check my patch imx6_ov5640_raw_captupre_test_4.14.98_2.0.0_ga.diff which apply on i.MX  Linux 4.14.98_2.0.0 BSP unit test code. Note the usage is: ./cap.out -c 1 -i 1 -fr 15 -m 6 -iw 2592 -ih 1944 -ow 2592 -oh 1944 -f BA81 -d /dev/video1 savefile.dmp parameter -i 1 means use CSI to MEM mode /dev/video1 is MIPI ov5640, /dev/video0 is parallel ov5640   4.Display RAW data The RAW data cannot be displayed directly, debayer process is needed to get complete red, green, blue color for each pixel. The debayer process if run on CPU, will cost much CPU time. To save CPU time, debayer could done by GPU. The method is, captured RAW data upload to GPU as texture , then GPU will do the debayer, then full color of each pixel will be got, then display it. To upload RAW camera data to GPU with zero memory copy, i will use i.MX6Q GPU extension GL_VIV_direct_texture. It create a texture with direct access support. API glTexDirectVIVMap,  which support mapping a user space memory or a physical address into the texture surface. The API glTexDirectVIVMap need logic and physical address of data buffer, so i will allocate data buffer from /dev/mxc_ipu, it is dma-buffer also get logic/physical address of buffer, then queue it as USERPTR to ipu v4l2 capture driver, after dequeue got RAW camera data, pass it to GPU for debayer. GPU side, I will use OpenGL shader code from "Efficient, High-Quality Bayer Demosaic Filtering on GPUs". Check my patch imx6-5640-debayer-testcode-gpusdk-5.2.0.diff which apply on i.MX GPU SDK 5.2.0 code. Note, here i only do is debayer, no extra process.   Known issue One thing is ov5640 output 5MP at 15fps, compare with output 5MP at 5fps, there are more noise of camera data at 15fps case. My debug found is , this noise seems come from ov5640 itself.   Reference: a>https://www.nxp.com/webapp/Download?colCode=IMX6DQRM b>https://www.nxp.com/webapp/Download?colCode=L4.14.98_2.0.0_MX6QDLSOLOX&appType=license c>https://github.com/NXPmicro/gtec-demo-framework d>https://www.nxp.com/docs/en/application-note/AN5305.pdf e>ov5640 data sheet f>ov5640 software application note g>Efficient, High-Quality Bayer Demosaic Filtering on GPUs https://www.semanticscholar.org/paper/Efficient%2C-High-Quality-Bayer-Demosaic-Filtering-on-McGuire/088a2f47b7ab99c78d41623bdfaf4acdb02358fb

Instrumenting A Board To instrument a board, the connection between the power supply and the target device needs to be broken, usually via a series resistor that's placed on the board. Sometimes the inductor needs to be lifted if no series resistor was included on the rail by the board's designer. In the ideal case, through-hole connections were also provided on the board for the connection of these off-board sensors. Here are three close-up photos that show several boards that have been instrumented: In all three cases, the sensors stand in place via the two outer current carrying wires. The middle and right used insulated wires where as the one on the left used bare wires. In all three cases, the sensor's + connection needs to go towards the power supply and the - connection goes to the target device. The outer wires here are 24-26 gauge. (The relatively heavy gauge wire is used to keep the series resistance of inserting a smart sensor to a minimum.) The ground connection is the middle hole of the smart sensor. In the left and middle photos, a 30 gauge wire connects to the middle hole ground connection on the  board. In the right photo, the ground wire was more conveniently added to a big cap just below the bottom of edge of the photo. Here are wider angle view photos of two of the boards above: The sensors on the left are free-standing since the current carrying wires are stiff enough to hold them upright. Care must be taken since too much flexing will cause a wire to break. Too much bending can also cause a short to the board (and that's why insulated wires were used on these boards). The board on the right has the sensors laying parallel to the board. They are not affixed to the board, but a wire is wrapped around the bundle of ribbon cables out of view past the right edge of the photo. For boards without the through hole connections, the smart sensors need to be immobilized to keep from pulling the SMT pads off the board. If there is room on the board or sides of connectors or large components, the sensors may be attached down with foam double-sticky tape (see photo below, sensor affixed on top i.MX7ULP): For boards where there are no convenient unpopulated areas or there are too many sensors, some other means needs to be devised to immoblize the smart sensors. In the left photo below, two inductors per sensor have been flipped and the two sensors inserted to instrument the two rails. The solder pads on the inductors would easily be broken off by any movement of the smart sensors, so a cage with clamps to hold the ribbon cables was 3D printed. On the back side, there is room for the aggregator to be zip tied to the bottom plate, so the instrumented board can be moved as a single unit with minimal flexing of the ribbon cables.

When you do long test (days or weeks) test on i.MX board and your test fails, you often wants to know what has happen with a JTAG probe. The problem is when you have 50 boards running in parallel, you don't have the budget to have 50 JTAG debug probe. If you do a "hot plug" of your JTAG probe, you have roughly one chance out 2 to reset your board... so you'll have to wait another couple of hour to resee the problem. Anyway to have a reliable JTAG plug with no reset, it is really simple... cut the RESET line on your cable! then you'll still be able to "attach" to your i.MX. On the MEK board, with a 10-pin JTAG connector, you have the cut the cable line 10 of the ribbon cable: On the cable, cut the reset line like this: With my Lauterbach JTAG  probe, when I do a "hot plug" I never have a reset of my i.MX. BR Vincent

The following document contains a list of document, questions and discussions that are relevant in the community based on amount of views. If you are having a problem, doubt or getting started in i.MX processors, you should check the following links to see if your doubt is in there. Yocto Project Freescale Yocto Project main page‌ Yocto Training - HOME‌ i.MX Yocto Project: Frequently Asked Questions‌ Useful bitbake commands‌ Yocto Project Package Management - smart  How to add a new layer and a new recipe in Yocto  Setting up the Eclipse IDE for Yocto Application Development Guide to the .sdcard format  Yocto NFS & TFTP boot  YOCTO project clean  Yocto with a package manager (ex: apt-get)  Yocto Setting the Default Ethernet address and disable DHCP on boot.  i.MX x Building QT for i.MX6  i.MX6/7 DDR Stress Test Tool V3.00  i.MX6DQSDL DDR3 Script Aid  Installing Ubuntu Rootfs on NXP i.MX6 boards  iMX6DQ MAX9286 MIPI CSI2 720P camera surround view solution for Linux BSP i.MX Design&Tool Lists  Simple GPIO Example - quandry  i.MX6 GStreamer-imx Plugins - Tutorial & Example Pipelines  Streaming USB Webcam over Network  Step-by-step: How to setup TI Wilink (WL18xx) with iMX6 Linux 3.10.53  Linux / Kernel Copying Files Between Windows and Linux using PuTTY  Building Linux Kernel  Patch to support uboot logo keep from uboot to kernel for NXP Linux and Android BSP (HDMI, LCD and LVDS)  load kernel from SD card in U-boot  Changing the Kernel configuration for i.MX6 SABRE  Android  The Android Booting process  What is inside the init.rc and what is it used for.  Others How to use qtmultimedia(QML) with Gstreamer 1.0

Host Environment: ubuntu 16.04 LTS Linux BSP For i.MX : version 4.9.88 The document has 5 main contents: 1. Compiling core-image-base in Yocto BSP --Copy u-boot source code to a new directory --Copy linux kernel source code to a new directory 2. Exporting 4.9.88 toolchain from Freescale Yocto BSP (1) Using MACHINE=imx7dsabresd to export the toolchain (2) Using MACHINE=imx6qsabresd to export the toolchain. Actually above 2 are the same toolchain after exporting. Here , only show any one of boards(not ARM64) can be used for MACHINE. So users only need to export it for one time, select (1) or (2) to export toolchain. (3) Using MACHINE=imx8mqevk to export ARM64 toolchain 3. Compling u-boot & linux kernel under Stanalone iMX7DSabreSD --Compiling  u-boot for imx7dsabresd --Compiling kernel and dtb for imx7dsabresd iMX8MQEVK --Compiling u-boot for imx8mqevk --Compiling kernel and dtb for imx8mqevk 4. Compiling OS Firmware for i.MX7DSabreSD board --u-boot for mfg tools --kernel and dtb for mfg tools 5. Copy OS Firmware to the related path of MFG tools --------------------------------------------------------------------------------------------------------------------------- [Content of Document] 1. Compiling core-image-base in Yocto BSP          After repo syn is done according to “i.MX_Yocto_Project_User's_Guide.pdf”, Use the command to compile linux BSP, u-boot & kernel source code will be released. # DISTRO=fsl-imx-fb MACHINE=imx7dsabresd source fsl-setup-release.sh -b build-fb # bitbake core-image-base          After compiling is done, u-boot & linux kernel source code is in the path below: u-boot: ~/imx-yocto-bsp/build-fb/tmp/work/imx7dsabresd-poky-linux-gnueabi/u-boot-imx/2017.03-r0/git linux: ~/imx-yocto-bsp/build-fb/tmp/work/imx7dsabresd-poky-linux-gnueabi/linux-imx/4.9.88-r0/git          We can create a new directory for uboot and linux kernel source code. Here I created a directory named disk2. # cd ~/ # mkdir disk2 # cd disk2 # mkdir u-boot-2017-03 # mkdir linux-imx-4.9.88 --Copy u-boot source code to a new directory # cd ~/imx-yocto-bsp/build-fb/tmp/work/imx7dsabresd-poky-linux-gnueabi/u-boot-imx/2017.03-r0/git # cp –r ./* ~/disk2/u-boot-2017-03 --Copy linux kernel source code to a new directory # cd ~/imx-yocto-bsp/build-fb/tmp/work/imx7dsabresd-poky-linux-gnueabi/linux-imx/4.9.88-r0/git # cp –r ./* ~/disk2/ linux-imx-4.9.88 2. Exporting 4.9.88 toolchain from Freescale Yocto BSP (1) Using MACHINE=imx7dsabresd to export the toolchain Step1: # cd ~/imx-yocto-bsp/ # DISTRO=fsl-imx-fb MACHINE=imx7dsabresd source fsl-setup-release.sh -b build-minimal … … Do you accept the EULA you just read? (y/n)  y EULA has been accepted. Welcome to Freescale Community BSP The Yocto Project has extensive documentation about OE including a reference manual which can be found at:     http://yoctoproject.org/documentation For more information about OpenEmbedded see their website:     http://www.openembedded.org/ You can now run 'bitbake <target>' Common targets are:     core-image-minimal     meta-toolchain     meta-toolchain-sdk     adt-installer     meta-ide-support Your build environment has been configured with:     MACHINE=imx7dsabresd     SDKMACHINE=i686     DISTRO=fsl-imx-fb     EULA= BSPDIR= BUILD_DIR=. meta-freescale directory found Here “build-minimal” is a directory for compiling source code, users can also set it other name. In ~/imx-yocto-bsp/build-minimal, Begin to export toolchain with the command. Step2: # DISTRO=fsl-imx-fb MACHINE=imx7dsabresd bitbake core-image-minimal -c populate_sdk [Comment-1] About DISTRO and MACHINE on above 2 commands MACHINE can be set the values below. imx6qpsabreauto imx6qpsabresd imx6ulevk imx6ull14x14evk imx6ull9x9evk imx6dlsabreauto imx6dlsabresd imx6qsabreauto imx6qsabresd imx6slevk imx6solosabreauto imx6solosabresd imx6sxsabresd imx6sxsabreauto imx6sllevk imx7dsabresd imx7ulpevk imx8mqevk   So MACHINE’s value is the name each Evaluation Borad. DISTRO can be set the values below: fsl-imx-x11 - X11 graphics are not supported on i.MX 8. fsl-imx-wayland - Wayland weston graphics. fsl-imx-xwayland - Wayland graphics and X11. X11 applications using EGL are not supported. fsl-imx-fb - Frame Buffer graphics - no X11 or Wayland. Frame Buffer is not supported on i.MX 8 bitbake rootfs type       core-image-minimal       core-image-base       core-image-sato       fsl-image-machine-test       fsl-image-validation-imx       fsl-image-qt5-validation-imx Below is the detailed description for above rootfs type: [Comment-2] Descriptions on difference of toolchain between i.MX6/7 and i.MX8MQ          i.MX6 and i.MX7 are both 32bit ARM processor, they use the same toolchain.          i.MX8MQ is 64bit ARM processor, so it’s toolchain is different from that of i.MX6/7. Setp 3:          After above compiling is done, enter into ~/imx-yocto-bsp/build-minimal/tmp/deploy/sdk # cd ~/imx-yocto-bsp/build-minimal/tmp/deploy/sdk # ls Run .sh file: Then continue operations according to guidance: Done: OK, Let us check /opt/fsl-imx-fb/ directory: # ls /opt/fsl-imx-fb/4.9.88-2.0.0/          Because we used MACHINE=imx7dsabresd, environment was named “cortex-A7”, compiler’s version is still 4.9.88. (2) Using MACHINE=imx6qsabresd to export the toolchain.          We can change “MACHINE=imx6qsabresd” and repeat above 3 steps, environment will be named “cortex-A9”.          Close the current terminal, and open a new one. # cd ~/ imx-yocto-bsp # DISTRO=fsl-imx-fb MACHINE=imx6qsabresd source fsl-setup-release.sh -b build-A9-min            Then automatically enter “~/imx-yocto-bsp/build-A9-min”, run command below. # DISTRO=fsl-imx-fb MACHINE=imx6qsabresd bitbake core-image-minimal -c populate_sdk # ~/imx-yocto-bsp/build-A9-min/tmp/deploy/sdk # ls # ./ fsl-imx-fb-glibc-x86_64-core-image-minimal-cortexa9hf-neon-toolchain-4.9.88-2.0.0.sh   Set it up in another directory: /opt/fsl-imx-fb/4.9.88 (3) Using MACHINE=imx8mqevk to export ARM64 toolchain          Export Toolchain for i.MX8MQ, create a new terminal, then run these 2 commands below. # ~/imx-yocto-bsp # DISTRO=fsl-imx-xwayland MACHINE=imx8mqevk source fsl-setup-release.sh -b build-xwayland # DISTRO=fsl-imx-fb MACHINE=imx8mqevk bitbake core-image-minimal -c populate_sdk Done.          Copy the toolchain to /opt/fsl-imx-fb directory # cd ~/imx-yocto-bsp/build-xwayland/tmp/deploy/sdk # ls #./fsl-imx-fb-glibc-x86_64-core-image-minimal-aarch64-toolchain-4.9.88-2.0.0.sh          I installed it to a new directory: /opt/fsl-imx-fb/4.9.88-arm64 #ls ls /opt/fsl-imx-fb/4.9.88-arm64/  OK, 64bit toolchain for i.MX8MQ has been exported to the directory. 3. Compling u-boot & linux kernel under Stanalone iMX7DSabreSD --Compiling  u-boot for imx7dsabresd # cd ~/disk2/u-boot-2017-03 # source /opt/fsl-imx-fb/4.9.88-2.0.0/environment-setup-cortexa7hf-neon-poky-linux-gnueabi # export ARCH=arm # make clean # make mx7dsabresd_defconfig # make u-boot.imx Done. --Compiling kernel and dtb for imx7dsabresd # cd ~/disk2/linux-imx-4.9.88/ [comment] If environment has been configured, that is, these 2 commands have been run on the current terminal, don’t need to run them again. “source /opt/fsl-imx-fb/4.9.88-2.0.0/environment-setup-cortexa7hf-neon-poky-linux-gnueabi” and “export ARCH=arm” # make clean # make imx_v7_defconfig # make            zImage is in “~/disk2/linux-imx-4.9.88/arch/arm/boot”          dtb is in “~/disk2/linux-imx-4.9.88/arch/arm/boot/dts”            Probably users want to run “make menuconfig”, and meet the errors like below. # sudo apt-get install libncurses*  (To solve the problem below) # make menuconfig [Comment-3]  Users can also use "environment-setup-cortexa9hf-neon-poky-linux-gnueabi" to compile u-boot and kernel. iMX8MQEVK --Compiling u-boot for imx8mqevk # cd ~/disk2/u-boot-2017-03 # source /opt/fsl-imx-fb/4.9.88-arm64/environment-setup-aarch64-poky-linux # export ARCH=arm64 # make clean # make imx8mq_evk_defconfig # make u-boot.imx Done. --Compiling kernel and dtb for imx8mqevk # cd ~/disk2/linux-imx-4.9.88/ [comment] If environment has been configured, that is, these 2 commands have been run on the current terminal, don’t need to run them again. “source /opt/fsl-imx-fb/4.9.88-arm64/environment-setup-aarch64-poky-linux” and “export ARCH=arm64” # make clean # make defconfig # make          Run the command to unset LDFLAGS: # unset LDFLAGS # make Done. 4. Compiling OS Firmware for i.MX7DSabreSD board --u-boot for mfg tools # make mx7dsabresd_config # make u-boot.imx          Then rename u-boot.imx to be “u-boot-mx7dsabresd-mfg.imx”. --kernel and dtb for mfg tools          Copy imx_v7_mfg_defconfig file to “arch/arm/configs”, then run commands below. # make imx_v7_mfg_defconfig # make          zImage will be generated at path arch/arm/boot.          dtb file will be generated at path arch/arm/boot/dts            Then rename zImage to be zImage-mx7dsabre-mfg,          Rename imx7d-sdb.dtb to be zImage-imx7d-sdb-mfg.dtb 5. Copy OS Firmware to the related path of MFG tools          Up to now, 3 files for OS Firmware has been generated, then copy these 3 files to mfgtools\Profiles\Linux\OS Firmware\firmware            When MFG Tools begins to run, these 3 files and ramdisk will be downloaded to SDRAM on board, then run them, and download images(u-boot\kernel\rootfs\)  which have been ready in  “mfgtools\Profiles\Linux\OS Firmware\files”.            Above steps and commands will be performed according to list in ucl2.xml. So customer will add a new list for her downloading or change an existing list according to image’s name. NXP TIC team Weidong Sun 04-25-2019

The document descript how to use the win32diskimager to create bootable sdcard.  How to resize sdcard mirror rootfs partition. Ex: fsl-image-validation-imx-imx6qpdlsolox.sdcard

The Linux L4.9.88_2.0.0 Rocko, i.MX7ULP Linux/SDK2.4 RFP(GA) release files are now available. Linux on IMX_SW web page, Overview -> BSP Updates and Releases ->Linux L4.9.88_2.0.0 SDK on https://mcuxpresso.nxp.com/ web page.   Files available: Linux:  # Name Description 1 imx-yocto-L4.9.88_2.0.0.tar.gz L4.9.88_2.0.0 for Linux BSP Documentation. Includes Release Notes, User Guide. 2 L4.9.88_2.0.0_images_MX6QPDLSOLOX.tar.gz i.MX 6QuadPlus, i.MX 6Quad, i.MX 6DualPlus, i.MX 6Dual, i.MX 6DualLite, i.MX 6Solo, i.MX 6Solox Linux Binary Demo Files 3 L4.9.88_2.0.0_images_MX6SLEVK.tar.gz i.MX 6Sololite EVK Linux Binary Demo Files 4 L4.9.88_2.0.0_images_MX6UL7D.tar.gz i.MX 6UltraLite EVK, 7Dual SABRESD, 6ULL EVK Linux Binary Demo Files 5 L4.9.88_2.0.0_images_MX6SLLEVK.tar.gz i.MX 6SLL EVK Linux Binary Demo Files 6 L4.9.88_2.0.0_images_MX8MQ.tar.gz i.MX 8MQuad EVK Linux Binary Demo files 7 L4.9.88_images_MX7ULPEVK.tar.gz i.MX 7ULP EVK Linux Binary Demo Files  8 L4.9.88_2.0.0-ga_mfg-tools.tar.gz Manufacturing Toolkit for Linux L4.9.88_2.0.0 iMX6,7 BSP 9 L4.9.88_2.0.0_mfg-tool_MX8MQ.tar.gz Manufacturing Toolkit for Linux L4.9.88_2.0.0 i.MX8MQ BSP 10 imx-aacpcodec-4.3.5.tar.gz Linux AAC Plus Codec for L4.9.88_2.0.0   SDK:   On https://mcuxpresso.nxp.com/, click the Select Development Board to customize the SDK based on your configuration then download the SDK package.    Target board: i.MX 6QuadPlus SABRE-SD Board and Platform i.MX 6QuadPlus SABRE-AI Board i.MX 6Quad SABRE-SD Board and Platform i.MX 6DualLite SABRE-SD Board i.MX 6Quad SABRE-AI Board i.MX 6DualLite SABRE-AI Board i.MX 6SoloLite EVK Board i.MX 6SoloX SABRE-SD Board i.MX 6SoloX SABRE-AI Board i.MX 7Dual SABRE-SD Board i.MX 6UltraLite EVK Board i.MX 6ULL EVK Board i.MX 6SLL EVK Board i.MX 7ULP EVK Board i.MX 8MQ EVK Board   What’s New/Features: Please consult the Release Notes.   Known issues For known issues and more details please consult the Release Notes.   More information on changes of Yocto, see: README: https://source.codeaurora.org/external/imx/imx-manifest/tree/README?h=imx-linux-rocko ChangeLog: https://source.codeaurora.org/external/imx/imx-manifest/tree/ChangeLog?h=imx-linux-rocko

   Some of Chinese customer couldn’t normally download android source code from google site, here give a way to download android source from Mirror site of University of Science and Technology of China. Preparations Installing Ubuntu16.04.2 LTS Customer can download ubuntu-16.04.2-desktop-amd64.iso from https://www.ubuntu.com/download/desktop        Then install it to VMware workstation player v12 or PC, after finishing installation, use “Software Update” to update system. In order to compile android8.0.0-1.0.0 BSP, necessary packages should also be installed on Ubuntu 16.04. $ sudo apt-get install gnupg $ sudo apt-get install flex $ sudo apt-get install bison $ sudo apt-get install gperf $ sudo apt-get install build-essential $ sudo apt-get install zip $ sudo apt-get install zlib1g-dev $ sudo apt-get install libc6-dev $ sudo apt-get install lib32ncurses5-dev   $ sudo apt-get install x11proto-core-dev $ sudo apt-get install libx11-dev $ sudo apt-get install lib32z1-dev   $ sudo apt-get install libgl1-mesa-dev $ sudo apt-get install tofrodos $ sudo apt-get install python-markdown $ sudo apt-get install libxml2-utils $ sudo apt-get install xsltproc $ sudo apt-get install uuid-dev:i386 liblzo2-dev:i386   $ sudo apt-get install gcc-multilib g++-multilib $ sudo apt-get install subversion $ sudo apt-get install openssh-server openssh-client $ sudo apt-get install uuid uuid-dev $ sudo apt-get install zlib1g-dev liblz-dev $ sudo apt-get install liblzo2-2 liblzo2-dev $ sudo apt-get install lzop $ sudo apt-get install git-core curl $ sudo apt-get install u-boot-tools $ sudo apt-get install mtd-utils $ sudo apt-get install android-tools-fsutils $ sudo apt-get install openjdk-8-jdk More detail, see Android_User’s_Guide.pdf ( android 8.0.0-1.0.0 BSP documents) Downloading and unpacking Android release package https://www.nxp.com/products/processors-and-microcontrollers/applications-processors/i.mx-applications-processors/android-os-for-i.mx-applications-processors:IMXANDROID?tab=Design_Tools_Tab --IMX_O8.0.0_1.0.0_ANDROID_SOURCE File name is mx-o8.0.0_1.0.0_ga.tar.gz # cd ~ # tar xzvf mx-o8.0.0_1.0.0_ga.tar Downloading Android 8.0.0-1.0.0 source code Getting repo # cd ~ # mkdir bin # cd bin # curl https://storage-googleapis.proxy.ustclug.org/git-repo-downloads/repo > ~/bin/repo # chmod a+x ~/bin/repo # export PATH=${PATH}:~/bin Modifying repo File Open ~/bin/repo file with 'gedit' and Change google address From            REPO_URL = 'https://gerrit.googlesource.com/git-repo' To REPO_URL ='git-repo - Git at Google ' 3、Setting email address # git config --global user.email "xxx@nxp.com" # git config --global user.name "xxxx"  [ Email & Name should be yours]   4、Modifying android setup script and Running it          Open ~/imx-o8.0.0_1.0.0_ga/imx_android_setup.sh and add a line like below: ......       if [ "$rc" != 0 ]; then          echo "---------------------------------------------------"          echo "-----Repo Init failure"          echo "---------------------------------------------------"          return 1       fi find -name 'aosp-O8.0.0-1.0.0.xml'| xargs perl -pi -e 's|https://android.googlesource.com/|git://mirrors.ustc.edu.cn/aosp/|g' fi   # Don't Delete .repo directory and hidden files #rm -rf $android_builddir/.??*    Then save it and exit. # cd ~/ # source ~/imx-o8.0.0_1.0.0_ga/imx_android_setup.sh Then android_build directory is created at ~/ # export MY_ANDROID=~/android_build [Note] imx_android_setup.sh will be in charge of downloading all android source code. 5.Begin to compile android 8.0.0 BSP $ export ARCH=arm $ export CROSS_COMPILE=${MY_ANDROID}/prebuilts/gcc/linux-x86/arm/arm-linuxandroideabi-4.9/bin/arm-linux-androideabi- $ cd ~/android_build $ source build/envsetup.sh $ lunch sabreauto_6q-userdebug $ make –j4 Errors: ...... “Try increasing heap size with java option '-Xmx<size>'.” ...... Logs for compiling     weidong@ubuntu:~/android_build$ lunch sabreauto_6q-userdebug   ============================================ PLATFORM_VERSION_CODENAME=REL PLATFORM_VERSION=8.0.0 TARGET_PRODUCT=sabreauto_6q TARGET_BUILD_VARIANT=userdebug TARGET_BUILD_TYPE=release TARGET_PLATFORM_VERSION=OPD1 TARGET_BUILD_APPS= TARGET_ARCH=arm TARGET_ARCH_VARIANT=armv7-a-neon TARGET_CPU_VARIANT=cortex-a9 TARGET_2ND_ARCH= TARGET_2ND_ARCH_VARIANT= TARGET_2ND_CPU_VARIANT= HOST_ARCH=x86_64 HOST_2ND_ARCH=x86 HOST_OS=linux HOST_OS_EXTRA=Linux-4.4.0-116-generic-x86_64-with-Ubuntu-16.04-xenial HOST_CROSS_OS=windows HOST_CROSS_ARCH=x86 HOST_CROSS_2ND_ARCH=x86_64 HOST_BUILD_TYPE=release BUILD_ID=1.0.0-rfp-rc4 OUT_DIR=out AUX_OS_VARIANT_LIST= ============================================ weidong@ubuntu:~/android_build$ make -j4 ============================================     ============================================ PLATFORM_VERSION_CODENAME=REL PLATFORM_VERSION=8.0.0 TARGET_PRODUCT=sabreauto_6q TARGET_BUILD_VARIANT=userdebug TARGET_BUILD_TYPE=release TARGET_ARCH=arm TARGET_ARCH_VARIANT=armv7-a-neon TARGET_CPU_VARIANT=cortex-a9 HOST_ARCH=x86_64 HOST_2ND_ARCH=x86 HOST_OS=linux HOST_OS_EXTRA=Linux-4.4.0-116-generic-x86_64-with-Ubuntu-16.04-xenial HOST_CROSS_OS=windows HOST_CROSS_ARCH=x86 HOST_CROSS_2ND_ARCH=x86_64 HOST_BUILD_TYPE=release BUILD_ID=1.0.0-rfp-rc4 OUT_DIR=out ============================================ [38/38] bootstrap out/soong/.minibootstrap/build.ninja.in [1/2] out/soong/.bootstrap/bin/minibp out/soong/.minibootstrap/build.ninja.in [4/4] out/soong/.bootstrap/bin/minibp out/soong/.bootstrap/build.ninja [791/792] glob vendor/*/*/Android.bp [47/47] out/soong/.bootstrap/bin/soong_build out/soong/build.ninja out/build-sabreauto_6q.ninja is missing, regenerating... [9/1005] including ./cts/Android.mk ... cts/hostsidetests/os/test-apps/StaticSharedNativeLibProvider/Android.mk:23: warning: FindEmulator: find: `cts/hostsidetests/os/test-apps/StaticSharedNativeLibProvider/src': No such file or directory cts/hostsidetests/os/test-apps/StaticSharedNativeLibProvider1/Android.mk:23: warning: FindEmulator: find: `cts/hostsidetests/os/test-apps/StaticSharedNativeLibProvider1/src': No such file or directory [690/1005] including ./system/sepolicy/Android.mk ... ./system/sepolicy/Android.mk:107: warning: BOARD_SEPOLICY_VERS not specified, assuming current platform version [1005/1005] including ./vendor/nxp/linux-firmware-imx/firmware/Android.mk ... No private recovery resources for TARGET_DEVICE sabreauto_6q platform_testing/build/tasks/tests/instrumentation_metric_test_list.mk: warning: continuous_instrumentation_metric_tests: Unknown installed file for module perf-setup.sh platform_testing/build/tasks/tests/instrumentation_test_list.mk: warning: continuous_instrumentation_tests: Unknown installed file for module RecyclerViewTests platform_testing/build/tasks/tests/instrumentation_test_list.mk: warning: continuous_instrumentation_tests: Unknown installed file for module SettingsFunctionalTests platform_testing/build/tasks/tests/instrumentation_test_list.mk: warning: continuous_instrumentation_tests: Unknown installed file for module LauncherFunctionalTests platform_testing/build/tasks/tests/instrumentation_test_list.mk: warning: continuous_instrumentation_tests: Unknown installed file for module EmergencyInfoTests platform_testing/build/tasks/tests/native_metric_test_list.mk: warning: continuous_native_metric_tests: Unknown installed file for module perf-setup.sh test/vts/tools/build/tasks/vts_package.mk:222: warning: FindEmulator: cd: vendor/google_vts/testcases: No such file or directory test/vts/tools/build/tasks/vts_package.mk:222: warning: FindEmulator: cd: vendor/google_vts/testcases: No such file or directory test/vts/tools/build/tasks/vts_package.mk:222: warning: FindEmulator: cd: vendor/google_vts/testcases: No such file or directory ./test/vts/utils/python/archive/Android.mk:28: warning: overriding commands for target `default' ./test/vts/runners/host/tcp_server/Android.mk:19: warning: ignoring old commands for target `default' build/core/Makefile:34: warning: overriding commands for target `out/target/product/sabreauto_6q/root/init.rc' build/core/base_rules.mk:378: warning: ignoring old commands for target `out/target/product/sabreauto_6q/root/init.rc' ...... ......  CC      lib/vsprintf.o   CC      lib/panic.o   CC      lib/strto.o   CC      lib/strmhz.o   LD      lib/built-in.o   CC      examples/standalone/hello_world.o   CC      examples/standalone/stubs.o   LD      examples/standalone/libstubs.o   LD      examples/standalone/hello_world   OBJCOPY examples/standalone/hello_world.bin   OBJCOPY examples/standalone/hello_world.srec   LD      u-boot   OBJCOPY u-boot-nodtb.bin   OBJCOPY u-boot.srec   SHIPPED dts/dt.dtb   SYM     u-boot.sym   COPY    u-boot.dtb   CAT     u-boot-dtb.bin   COPY    u-boot.bin   CFGS    board/freescale/mx6qsabreauto/mx6qp.cfg.cfgtmp   MKIMAGE u-boot-dtb.imx   CFGCHK  u-boot.cfg make[1]: Leaving directory '/home/weidong/android_build/out/target/product/sabreauto_6q/obj/BOOTLOADER_OBJ' make: Leaving directory '/home/weidong/android_build/vendor/nxp-opensource/uboot-imx' /bin/bash: line 0: [: =: unary operator expected [  3% 2129/63758] Check module type: out/target/common/obj/APPS/Browser2_intermediates/link_type packages/apps/Browser2/Android.mk: warning: Browser2 (java:sdk) should not link to legacy-android-test (java:platform) [  3% 2171/63758] Ensuring Jack server is installed and started Jack server already installed in "/home/weidong/.jack-server" Launching Jack server java -XX:MaxJavaStackTraceDepth=-1 -Djava.io.tmpdir=/tmp -Dfile.encoding=UTF-8 -XX:+TieredCompilation -cp /home/weidong/.jack-server/launcher.jar com.android.jack.launcher.ServerLauncher Server updated, waiting for restart ...... ...... D [M]  drivers/rpmsg/imx_rpmsg_tty.ko   LD [M]  drivers/video/backlight/l4f00242t03.ko   CC      arch/arm/boot/compressed/misc.o   LD [M]  drivers/video/backlight/platform_lcd.ko   LD [M]  drivers/video/backlight/lcd.ko   CC      arch/arm/boot/compressed/decompress.o   CC      arch/arm/boot/compressed/string.o   SHIPPED arch/arm/boot/compressed/hyp-stub.S   SHIPPED arch/arm/boot/compressed/lib1funcs.S   SHIPPED arch/arm/boot/compressed/ashldi3.S   SHIPPED arch/arm/boot/compressed/bswapsdi2.S   AS      arch/arm/boot/compressed/hyp-stub.o   AS      arch/arm/boot/compressed/lib1funcs.o   AS      arch/arm/boot/compressed/ashldi3.o   AS      arch/arm/boot/compressed/bswapsdi2.o   AS      arch/arm/boot/compressed/piggy.o   LD      arch/arm/boot/compressed/vmlinux   OBJCOPY arch/arm/boot/zImage   Kernel: arch/arm/boot/zImage is ready make[1]: Leaving directory '/home/weidong/android_build/out/target/product/sabreauto_6q/obj/KERNEL_OBJ' make: Leaving directory '/home/weidong/android_build/vendor/nxp-opensource/kernel_imx' make: Entering directory '/home/weidong/android_build/vendor/nxp-opensource/kernel_imx' make[1]: Entering directory '/home/weidong/android_build/out/target/product/sabreauto_6q/obj/KERNEL_OBJ'   CHK     include/config/kernel.release   GEN     ./Makefile   CHK     include/generated/uapi/linux/version.h   Using /home/weidong/android_build/vendor/nxp-opensource/kernel_imx as source for kernel   CHK     include/generated/utsrelease.h   CHK     include/generated/timeconst.h   CHK     include/generated/bounds.h   CHK     include/generated/asm-offsets.h   CALL    /home/weidong/android_build/vendor/nxp-opensource/kernel_imx/scripts/checksyscalls.sh make[1]: Leaving directory '/home/weidong/android_build/out/target/product/sabreauto_6q/obj/KERNEL_OBJ' make: Leaving directory '/home/weidong/android_build/vendor/nxp-opensource/kernel_imx'   ...... ...... [ 83% 53244/63758] Building with Jack: out/target/co...ARIES/framework_intermediates/with-local/classes.dex FAILED: out/target/common/obj/JAVA_LIBRARIES/framework_intermediates/with-local/classes.dex /bin/bash out/target/common/obj/JAVA_LIBRARIES/framework_intermediates/with-local/classes.dex.rsp Out of memory error (version 1.3-rc7 'Douarn' (445000 d7be3910514558d6715ce455ce0861ae2f56925a by android-jack-team@google.com)). GC overhead limit exceeded. Try increasing heap size with java option '-Xmx<size>'. Warning: This may have produced partial or corrupted output. [ 83% 53247/63758] //external/llvm/lib/CodeGen/SelectionDAG:libLLVMSelectionDAG clang++ DAGCombiner.cpp ninja: build stopped: subcommand failed. 19:17:25 ninja failed with: exit status 1 build/core/main.mk:21: recipe for target 'run_soong_ui' failed make: *** [run_soong_ui] Error 1   ******************************************************* solve the issue: Try increasing heap size with java option '-Xmx<size>'. -- run commands below on command line #export JACK_SERVER_VM_ARGUMENTS="-Dfile.encoding=UTF-8 -XX:+TieredCompilation -Xmx4g" #./prebuilts/sdk/tools/jack-admin kill-server #./prebuilts/sdk/tools/jack-admin start-server ******************************************************* #make -j4   //continue compiling   ...... ...... [ 50% 1/2] glob vendor/*/*/Android.bp [  0% 1/10515] Ensuring Jack server is installed and started Jack server already installed in "/home/weidong/.jack-server" Server is already running ...... ...... Creating filesystem with parameters:     Size: 1585446912     Block size: 4096     Blocks per group: 32768     Inodes per group: 8064     Inode size: 256     Journal blocks: 6048     Label: system     Blocks: 387072     Block groups: 12     Reserved block group size: 95 Created filesystem with 2216/96768 inodes and 171147/387072 blocks Running:  build_verity_tree -A aee087a5be3b982978c923f566a94613496b417f2af592639bc80d141e34dfe7 out/target/product/sabreauto_6q/obj/PACKAGING/systemimage_intermediates/system.img /tmp/tmpPnRk1H_verity_images/verity.img f26a84a2c66d866f5322986e7a093812329d87579e5859aa32a2cf4c21f69661 aee087a5be3b982978c923f566a94613496b417f2af592639bc80d141e34dfe7 Running:  system/extras/verity/build_verity_metadata.py build 1585446912 /tmp/tmpPnRk1H_verity_images/verity_metadata.img f26a84a2c66d866f5322986e7a093812329d87579e5859aa32a2cf4c21f69661 aee087a5be3b982978c923f566a94613496b417f2af592639bc80d141e34dfe7 /dev/block/by-name/system verity_signer build/target/product/security/verity.pk8 ['verity_signer', '/tmp/tmpvXftO2.table', 'build/target/product/security/verity.pk8', '/tmp/tmpbfl4fq.sig'] appending /tmp/tmpPnRk1H_verity_images/verity_metadata.img to /tmp/tmpPnRk1H_verity_images/verity.img Running:  fec -e -p 0 out/target/product/sabreauto_6q/obj/PACKAGING/systemimage_intermediates/system.img /tmp/tmpPnRk1H_verity_images/verity.img /tmp/tmpPnRk1H_verity_images/verity_fec.img encoding RS(255, 253) to '/tmp/tmpPnRk1H_verity_images/verity_fec.img' for input files:        1: 'out/target/product/sabreauto_6q/obj/PACKAGING/systemimage_intermediates/system.img'        2: '/tmp/tmpPnRk1H_verity_images/verity.img' appending /tmp/tmpPnRk1H_verity_images/verity_fec.img to /tmp/tmpPnRk1H_verity_images/verity.img Running:  append2simg out/target/product/sabreauto_6q/obj/PACKAGING/systemimage_intermediates/system.img /tmp/tmpPnRk1H_verity_images/verity.img   [100% 10515/10515] Install system fs image: out/target/product/sabreauto_6q/system.img out/target/product/sabreauto_6q/system.img+out/target/product/sabreauto_6q/obj/PACKAGING/recovery_patch_intermediates/recovery_from_boot.p maxsize=1644331392 blocksize=4224 total=704129669 reserve=16612992   #### make completed successfully (01:21:12 (hh:mm:ss)) ####   NXP TIC team Weidong sun 2018-06-01

meta-avs-demos Yocto layer meta-avs-demos is a Yocto meta layer (complementary to the NXP BSP release for i.MX) published on CodeAurora that includes the additional required packages to support  Amazon's Alexa Voice Services SDK (AVS_SDK) applications. The build procedure is the described on the README.md of the corresponding branch. We have 2 fuctional branches now: imx-alexa-sdk: Support for Morty based i.mx releases imx7d-pico-avs-sdk_4.1.15-1.0.0: legacy support for Jethro releases The master branch is only used to collect manifest files, that used with repo init/sync commands will fetch the whole environment for the 2 special supported boards: i.MX7D Pico Pi and i.MX8M EVK. However the meta-avs-demos can be used with any i.MX board either. Recipes to include Amazon's Alexa Voice Services in your applications. The meta-avs-demos provides the required recipes to build an i.MX image with the support for running Alexa SDK. The imx-alexa-sdk branch is based on Morty and kernel 4.9.X and it supports the next builds: i.MX7D Pico Pi i.MX8M EVK Generic i.MX board For the i.MX7D Pico Pi and i.MX8M EVK there is an extended support for additional (external) Sound Cards like: TechNexion VoiceHat: 2Mic Array board with DSPConcepts SW support Synaptics Card: 2 Mic with Sensory WakeWord support The Generic i.MX is for any other regular i.MX board supported on the official NXP BSP releases. Only the default soundcard (embedded) on the board is supported. Sensory wakeword is currently only enabled for those with ARMV7 architecture. To support any external board like the VoiceHat or Synaptics is up to the user to include the additional patches/changes required. Build Instructions Follow the corresponding README file to follow the steps to build an image with Alexa SDK support README-IMX7D-PICOPI.md README-IMX8M-EVK.md README-IMX-GENERIC.md

NOTE: Always de-power the target board and the aggregator when plugging or unplugging smart sensors from the aggregator. The aggregator portion of the i.MX Power Profiling System sits between the "smart" current sensor boards and the host computer. It provides power and signal connections to each connected sensor board. The communication is done over I2C, where three I2C bus extenders (PCA9518) effectively provide a dedicated bus to each I2C device, to better allow for cabling.  More information will follow... A photo, layout images and schematic attached below.   MBED source for the FRDM-KL25Z is available here: 30848-KL25Z-AGGREGATOR    Smart Sensor Connections At each smart sensor header JP0-JP13, these are the connections provided: 5V: powers the 3.3V regulator on each sensor board 12V: all the gates of all the switching FETs are pulled pulled up to 12V GND: ground connection SCL/TX0: I2C clock line  SDA/RX0: I2C data line  SWD_CLK:  global line for triggering smart sensors to make measurements RESET_B:  global line for resetting all smart sensor boards SWD_IO_n: individual select line for each smart sensor I2C Bus Connection Three I2C bus extenders (PCA9518) provide buffered connections between the FRDM board and all the connected smart sensors. The bus extenders were added to allow for longer cables between the aggregator and the smart sensor boards. Each bus extender has five ports and along with connections that allow extending the bus to more bus extenders. Gate Supply The aggregator contains a boost regulator that boost the 5V input from the FRDM board to 12V. The boosted voltage is fed to each of the smart sensor headers. It's used by the smart sensor board to pull up the gates of the switching FETs above any of the rails under test by at least 4.5V in order to benefit from a lower Rds(on). Caution must be exercised with some older FRDM boards since the 5V from the USB connection passes through diodes with a maximum current of 200mA.  The boost regulator and the load presented by the smart sensor boards may exceed the diode's limit and damage it. (Yes, it's happened... two older FRDM-KL25Z boards were used during development. One of them failed with the diode shorted (~0.05 Ohms), so everything kept working. The other failed with a  short of ~45 Ohms, so it kind of worked but not really...) Application Code for Aggregator  To date, application code has only been developed for the FRDM-KL25Z board. The latest application code resides at: https://os.mbed.com/users/r14793/code/30848-KL25Z-AGGREGATOR/, with the latest binary attached below. SWD Programming of Smart Sensors  Connectors J5 and JP15 are provided as an adapter for programming the smart sensor boards via SWD. JP15 provides power to the smart sensor board, since they have no direct 3.3V input for the KL05Z. An SWD programmer (or suitably modified FRDM-KL05Z board) connects to J5. Both connections use 10-pin 0.05"-spaced ribbon cables. Additionally, when a smart sensor is connected to JP15, J6 provides access to the UART pins of the smart sensor (the I2C pins on the smart sensor also mux out the UART of the KL05Z). No hardware changes are necessary at all; changing the code running on the smart sensor is all that's required. In fact, during the initial prototyping of the smart sensors, the serial UART connection was used instead of I2C. Modify Aggregator To Use SWD Dongle To Program Smart Sensor:  Add a wire as shown on the bottom side of the aggregator board as shown below. This ties 3.3V on the aggregator to the debug header, enabling the voltage level translators on the dongle to communicate with the KL05Z on the smart sensor board.  

NOTE: Always de-power the target board and the aggregator when plugging or unplugging smart sensors from the aggregator. NOTE: See this link to instrument a board with a Smart Sensor. Overview The i.MX Power Profiler system consists of one to fourteen "smart" current sensors, an aggregator shield, and a Kinetis FRDM board (the FRDM-KL25 has been used in prototyping but the FRDM-K64F and FRDM-K66F should also be fully compatible). One of the biggest improvements of this system over its preceeding dual-range measurement system is that the microcontroller on each sensor board allows near-simultaneous measurement of all instrumented rails on a board. The dual range profiler has only a single MCU for all sensors, so only one measurement can be made at a time.  It is intended to be used to instrument one to fourteen rails of a target i.MX appliation board. Ideally, the target board will have been designed with a matching/mating power sense footprint for each rail to be measured.  Each smart sensor can sense current in three ranges with three current sense amplifiers. They are "smart" because each sensor board has a Kinetis KL05Z on it to control the switching FETs and to digitize the analog signals (the sense amplifier outputs and the target's power supply rail voltage). A 1% voltage regulator on each smart sensor provides a good voltage reference right next to the KL05Z to ensure better ADC accuracy. Each smart sensor board communicates via I2C. The aggregator shield has three I2C bus extenders (PCA9518) which essentially provide a dedicated I2C bus for each of the connected smart sensors. The FRDM board's I2C is also connected to one of the bus extenders ports. Individual GPIO lines are routed to each smart sensor's connected along with a ganged reset and trigger line for all of the connected smart sensors. A boost regulator generates almost 12V from the FRDM board's 5V supply, which is used for all the switching FETs on the smart sensor boards. The FRDM board's 5V rail is also routed to each smart sensor, which is regulated down to 3.3V locally on each connected smart sensor. Here is a photo of the very first prototypes after moving to 10-pin 0.05" spaced headers and ribbon cables instead of FFC: The smart sensor is intended to mate with through-hole current sense tap points on the target i.MX application board. Three holes spaced at 0.05" each. When not instrumented with sensor, a short needs to be placed across the outer two pins so that the board will function normally. The through hole connections provide physical protection to the target board, keeping traces from getting ripped off. The ground connection in the center provides a reference for meauring the rail voltage on the target board. A partial layout example of the implementation of the current sense footprint is below, where two 0805 shorting resistors in parallel are placed on each side of the holes. The top trace connects to the regulator output and the bottom to the load, usually an i.MX power supply rail. To include the current sense footprint into a board during the design phase, it should be configured as in the following partial schematic:  Every effort should be made to place the feedback on the i.MX side of the sense points so that the regulator compensates for the additional series resistance of the smart sensor, which effectively eliminates the additional series resistance the smart sensor adds. The Feedback should be before the smart sensor if the switching supply won't tolerate the additional series resistance (i.e., output becomes unstable).

Host TFTP and NFS Configuration Now configure the Trivial File Transfer Protocol (TFTP) server and Networked File System (NFS) server. U-Boot will download the Linux kernel and dtb file using tftp and then the kernel will mount (via NFS) its root file system on the computer hard drive. 1. TFTP Setup   1.1.1 Prepare the TFTP Service   Get the required software if not already set up. On host for TFTP: Install TFTP on Host $ sudo apt-get install tftpd-hpa   (Note: There are a number of examples in various forums, etc, of how to automatically start the TFTP service - but not all are successful on all Linux distro's it seems! The following may work for you.)   Start the tftpd-hpa service automatically by adding a command to /etc/rc.local. $ vi /etc/rc.local   Now, just before the exit 0 line edit below command then Save and Exit. $ service tftpd-hpa start  Now, To control the TFTP service from the command line use: $ service tftpd-hpa restart    To check the status of the TFTP service from the command line use: $ service tftpd-hpa status   1.1.1 Setup the TFTP Directories Now, we have to create the directory which will contain the kernel image and the device tree blob file. $ mkdir -p /imx-boot/imx6q-sabre/tftp Then, copy the kernel image and the device tree blob file in this directory. $ cp {YOCTO_BUILD_DIR}/tmp/deploy/images/{TARGET}/zImage /imx-boot/imx6q-sabre/tftp $ cp {YOCTO_BUILD_DIR}/tmp/deploy/images/{TARGET}/<dtb file> /imx-boot/imx6q-sabre/tftp   OR we can use the default directory created by yocto {YOCTO_BUILD_DIR}/tmp/deploy/images/{TARGET}/ The tftpd-hpa service looks for requested files under /imx-boot/imx6q-sabre/tftp The default tftpd-hpa directory may vary with distribution/release, but it is specified in the configuration file: /etc/default/tfptd-hpa. We have to change this default directory with our directory   Edit default tftp directory $ vi /etc/default/tftpd-hpa   Now, change the directory defined as TFTP_DIRECTORY with your host system directory which contains kernel and device tree blob file. Using created directory TFTP_DIRECTORY=”/imx-boot/imx6q-sabre/tftp” OR Using Yocto directory path TFTP_DIRECTORY=”{YOCTO_BUILD_DIR}/tmp/deploy/images/{TARGET}” Restart the TFTP service if required $ service tftpd-hpa restart   1.2 NFS Setup 1.2.1 Prepare the NFS Service Get the required software if not already set up. On host for NFS: Install NFS on Host $ sudo apt-get install nfs-kernel-server The NFS service starts automatically. To control NFS services : $ service nfs-kernel-server restart To check the status of the NFS service from the command line : $ service nfs-kernel-server status 1.2.2 Setup the NFS Directories Now, we have to create the directory which will contain the root file system. $ mkdir -p /imx-boot/imx6q-sabre/nfs   Then, copy the rootfs in this directory. $ cp -R {YOCTO_BUILD_DIR}/tmp/work/{TARGET}-poky-linux-gnueabi/{IMAGE}/1.0-r0/rootfs/* /imx-boot/imx6q-sabre/nfs   OR we can use the default directory created by yocto. $ {YOCTO_BUILD_DIR}/tmp/work/{TARGET}-poky-linux-gnueabi/{IMAGE}/1.0-r0/rootfs 1.2.3 Update NFS Export File The NFS server requires /etc/exports to be configured correctly to access NFS filesystem directory to specific hosts. $ vi /etc/exports Then, edit below line into the opened file. <”YOUR NFS DIRECTORY”> <YOUR BOARD IP>(rw,sync,no_root_squash,no_subtree_check) Ex. If you created custom directory for NFS then, /imx-boot/imx6q-sabre/nfs <YOUR BOARD IP>(rw,sync,no_root_squash,no_subtree_check) Ex: /imx-boot/imx6q-sabre/nfs 192.168.*.*(rw,sync,no_root_squash,no_subtree_check) OR /{YOCTO_BUILD_DIR}/tmp/work/{TARGET}-poky-linux-gnueabi/{IMAGE}/1.0-r0/rootfs <YOUR BOARD IP>(rw,sync,no_root_squash,no_subtree_check)   Now, we need to restart the NFS service. $ service nfs-kernel-server restart   2 Target Setup   We need to set up the network IP address of our target. Power On the board and hit a key to stop the U-Boot from continuing. Set the below parameters, setenv serverip 192.168.0.206       //This must be your Host IP address The path where the rootfs is placed in our host has to be indicated in the U-Boot, Ex. // if you choose default folder created by YOCTO setenv nfsroot /{YOCTO_BUILD_DIR}/tmp/work/{TARGET}-poky-linux-gnueabi/{IMAGE}/1.0-r0/rootfs   OR // if you create custom directory for NFS setenv nfsroot /imx-boot/imx6q-sabre/nfs Now, we have to set kernel image name and device tree blob file name in the u-boot, setenv image < zImage name > setenv fdt_file <dtb file name on host> Now, set the bootargs for the kernel boot, setenv netargs 'setenv bootargs console=${console},${baudrate} ${smp} root=/dev/nfs ip=dhcp nfsroot=${serverip}:${nfsroot},v3,tcp' Use printenv command and check loadaddr and fdt_addr environment variables variables for I.MX6Q SABRE, loadaddr=0x12000000 fdt_addr=0x18000000   Also, check netboot environment variable. It should be like below, netboot=echo Booting from net ...; run netargs; if test ${ip_dyn} = yes; then setenv get_cmd dhcp; else setenv get_cmd tftp; fi; ${get_cmd} ${image}; if test ${boot_fdt} = yes || test ${boot_fdt} = try; then if ${get_cmd} ${fdt_addr} ${fdt_file}; then bootz ${loadaddr} - ${fdt_addr}; else if test ${boot_fdt} = try; then bootz; else echo WARN: Cannot load the DT; fi; fi; else bootz; fi; Now, set environment variable bootcmd to boot every time from the network, setenv bootcmd run netboot Now finally save those variable in u-boot: saveenv Reset your board; it should now boot from the network: U-Boot 2016.03-imx_v2016.03_4.1.15_2.0.0_ga+ga57b13b (Apr 17 2018 - 17:13:43 +0530)  (..) Net:   FEC [PRIME] Normal Boot Hit any key to stop autoboot:  0   Booting from net ... Using FEC device TFTP from server 192.168.0.206; our IP address is 192.168.3.101 Filename 'zImage'. Load address: 0x12000000 Loading: #################################################################         #################################################################         #################################################################         #################################################################         #################################################################         #################################################################         ###########################################################         2.1 MiB/s done Bytes transferred = 6578216 (646028 hex) Using FEC device TFTP from server 192.168.0.206; our IP address is 192.168.3.101 Filename 'imx6q-sabresd.dtb'. Load address: 0x18000000 Loading: ####         1.8 MiB/s done Bytes transferred = 45893 (b345 hex) Kernel image @ 0x12000000 [ 0x000000 - 0x646028 ] ## Flattened Device Tree blob at 18000000   Booting using the fdt blob at 0x18000000   Using Device Tree in place at 18000000, end 1800e344 switch to ldo_bypass mode!   Starting kernel ...

I have finally been able to get multi MSI (not MSI-X) working on the i.MX6 using the Linux kernel v4.1.15 release supported by Freescale/NXP. Attached are four patches which will need to be applied. This has been tested with two different end point FPGA devices with the i.MX6 running in root complex, I can confirm that multi MSI is now working.   Freescale/NXP: Please put these patches in your supported main line so others can have native multi MSI support.   You may have to contact your board manufacturer to find where within Yocto you will need to store these patches. If just building the kernel outside of Yocto then you can directly apply them.   The four kernel (v4.1.15) files which need to be patched are: <kernel source path>/include/linux/msi.h <kernel source path>/drivers/pci/msi.c <kernel source path>/drivers/pci/host/pcie-designware.h <kernel source path>/drivers/pci/host/pcie-designware.c   Once the above patches are applied and you create a new image/build you can start using the multi MSI APIs in your driver and pci_msi_vec_count() and pci_enable_msi_range() will work; this assumes your end point device on the PCIe link is working correctly.   Hopefully this is helpful to those who need multi MSI.   This document was generated from the following discussion: SOLVED: i.MX6 and Multi MSI Working

The i.MX Android O8.0.0_1.0.0 GA release is now available from IMX_SW page. Overview -> BSP Updates and Releases -> Android 8.0.0 Oreo (O8.0.0_1.0.0, 4.9 kernel)   Files available: # Name Description 1 android_O8.0.0_1.0.0_docs.tar.gz i.MX Android O8.0.0_1.0.0 BSP Documentation 2 imx-o8.0.0_1.0.0_ga.tar.gz i.MX Android O8.0.0_1.0.0 proprietary surce code for i.MX 6QuadPlus, i.MX 6Quad, i.MX 6DualPlus, i.MX 6Dual, i.MX 6DualLite, i.MX 6Solo  i.MX 6Sololite, i.MX6SX and i.MX7D 3 android_O8.0.0_1.0.0_image_6dqpsabreauto.tar.gz Binary Demo Files of Android O8.0.0_1.0.0 BSP - SABRE for Automotive Infotainment based on i.MX 6QuadPlus, i.MX 6Quad, and i.MX 6DualLite 4 android_O8.0.0_1.0.0_image_6dqpsabresd.tar.gz Binary Demo Files of Android O8.0.0_1.0.0 BSP - SABRE Platform and SABRE Board based on i.MX 6QuadPlus, i.MX 6Quad and i.MX 6DualLite. 5 android_O8.0.0_1.0.0_image_6slevk.tar.gz Binary Demo Files of Android O8.0.0_1.0.0 BSP - i.MX 6Sololite evaluation kit. 6 android_O8.0.0_1.0.0_image_6sxsabresd.tar.gz Binary Demo Files of Android O8.0.0_1.0.0 BSP - SABRE Board based on i.MX 6SoloX 7 android_O8.0.0_1.0.0_image_6sxsabreauto.tar.gz Binary Demo Files of Android O8.0.0_1.0.0 BSP - SABRE for Automotive infotainment based on i.MX 6SoloX 8 android_O8.0.0_1.0.0_image_7dsabresd.tar.gz Binary Demo Files of Android O8.0.0_1.0.0 BSP - SABRE Board based on i.MX 7Dual 9 fsl_aacp_dec_O8.0.0_1.0.0.tar.gz AAC Plus Codec for O8.0.0_1.0.0 10 android_O8.0.0_1.0.0_tools.tar.gz Manufacturing Toolkit and VivanteVTK for O8.0.0_1.0.0   Supported Hardware SoC/Boards: i.MX 6Quad, i.MX 6QuadPlus, and i.MX 6DualLite SABRE-SD board and platform i.MX 6Quad, i.MX 6QuadPlus, and i.MX 6DualLite SABRE-AI board and platform i.MX 6SoloLite EVK platform i.MX 6SoloX SABRE-SD board and platforms i.MX 6SoloX SABRE-AI board and platforms i.MX 7Dual SABRE-SD board and platform   Changes: Compared to the N7.1.2_2.0.0 release, this release has the following major changes: Upgraded the Android code base from android-7.1.2_r9 to android-8.0.0_r25. Removed the device partition and added the vendor partition. Enabled ION-based gralloc and EGL. Feature: For features please consult the release notes.   Known issues For known issues and more details please consult the Release Notes.