When I use QMediaPlayer (Qt5.1.1) to play a FHD video, the CPU (imx6dl) usage turns very high and the output is not fluid and also has some frame drop. I found a patch that claims to solve this problem (links below are taking about the same thing) : adding zero-copy-QSGVideoNode for imx6 - Qt by Digia https://www.mail-archive.com/[email protected]/msg08580.html After patch appliance and recompilation of Qt Library and program rebuild, the performance issue remains the same. Does anybody know how to enable this property correctly? Have I missed some points or mandatory steps? Any comment will be appreciated, thanks!

hi daiane       find the attached log of gstreamer

The i.MX 6 D/Q/DL/S/SL  Linux L3.0.101_4.1.1 Patch release is now available on [www.freescale.com]www.freescale.com ·          Target HW boards o   i.MX6DL  SABRE SD board o   i.MX6Q  SABRE SD board o   i.MX6DQ SABRE AI board o   i.MX6DL SABRE AI board o   i.MX6SL EVK board This patch release is based on the i.MX 6 Linux 3.0.35_4.1.0 release. The purposes of this patch release are as follows: ·         To fix the BSP multimedia GPU bugs ·         To upgrade the Linux kernel to v3.0.101 ·         To upgrade the multimedia library ·         To upgrade the GPU driver and library to 4.6.9p13 Please consult the release notes for more details. ​

OpenCV (Open Source Computer Vision Library) is released under a BSD license and hence it’s free for both academic and commercial use. It has C++, C, Python and Java interfaces and supports Windows, Linux, Mac OS, iOS and Android. OpenCV was designed for computational efficiency and with a strong focus on real-time applications. Written in optimized C/C++, the library can take advantage of multi-core processing. Enabled with OpenCL, it can take advantage of the hardware acceleration of the underlying heterogeneous compute platform In current bsp , which supports opencv 2.4, but some customer wants to use the opencv 3.1, then one can use the morty yocto bsp to install the opencv. step 1: for how to install the package on ubuntu and how to build the environment, pls refer to the bsp user guide, for how to build the branch morty, try to use the command as below: MACHINE=imx6qsabresd source fsl-setup-release.sh -b build_qt5 -e fb step 2: for how to enable the opencv, pls add the command as below in the local.conf, the path is fsl-release-bsp/build/conf, "CORE_IMAGE_EXTRA_INSTALL += "libopencv-core-dev libopencv-highgui-dev libopencv-imgproc-dev libopencv-objdetect-dev libopencv-ml-dev" CORE_IMAGE_EXTRA_INSTALL += "opencv-apps opencv-dev python-opencv python-modules"" then build again by bitbake. then you can find the image in the fsl-release-bsp/build/tmp/deploy/images/im6qsabresd/, one can find the opencv libary when extracting the rootfs file step 3: then you can use dd command or mfgtool downloading the image file to the board and use the opencv libary file. other usage: one can install the populate_sdk to build the source code, for opencv 3.1, maybe you will find some g++ issue to fix, so just simple introduce this use the command: bitbake -c populate_sdk fsl-image-gui(for example)  then you can find the sdk install file in the fsl-release-bsp/build_x11/tmp/deploy/sdk, run the install file, set the installation file in the /opt/poky, then you can find the toolchain in the /opt/poky after install successfully.

New i.mx6Q core board from OpenEmbed.com

In every i.MX BSP you will find a pre-compiled binary to flash on your board, but if you need to recompile, this tutorial will be useful. Redboot source code and pre-built images for many platforms are available on Linux Board Support Package (BSP). As an example, let's compile redboot version 2009_10 that comes with Freescale Linux BSP.   For detailed information about Redboot, check <redboot_folder>/doc Locate the file ecostools.tar.gz and decompress it on /opt directory. (Create this folder if it is not there) $ cd /opt $ sudo tar zxvf <redboot_folder>/tools/ecos_config_tools.tar.gz $ sudo tar zxvf <redboot_folder>/tools/arm-2008q1.tar.gz This creates /opt/ecostools directory with two subdirectories: arm-2008q1 -- GNU tools for compiling, linking, etc. tools -- mainly to have ecosconfig utility program Add /opt/arm-2008q1/bin and /opt/tools/bin to your environment PATH variable. $ export PATH=$PATH:/opt/arm-2008q1/bin:/opt/tools/bin Generating RedBoot Image Decompress the ecos-trunk-080727.tar.bz2 base line source code into <redboot_folder>/src. There should be a 'packages' directory under <redboot_folder>/src/ecos if it is done correctly. $ tar xjvf ecos-trunk-080727.tar.bz2 Go to ecos subdirectory and apply the patches; $ cd ecos $ bunzip2 -c patch-redboot-200910-base.bz2 | patch -p1 The above command assumes the patch file is under the same directory as the <redboot_folder>/src/ecos. Specify the path name for the patch file if necessary. Apply the patch for specific platform. In this case, the used patch is: patch-redboot-200834-mx3.bz2 $ patch-redboot-200910-mx3.bz2 | patch -p1 Define the ECOS_REPOSITORY. On <redboot_folder>, put the entire (absolute) path to redboot folder. I.e. ~/<redboot_folder>/src/ecos/packages $ export ECOS_REPOSITORY=<redboot_folder>/src/ecos/packages To build redboot (for i.MX31 in this example), create a new folder in order to have a clean build: $ mkdir new_redboot $ cd new_redboot $ ecosconfig new mx31_3stack redboot $ ecosconfig import $ECOS_REPOSITORY/hal/arm/mx31/3stack/current/misc/redboot_ROMRAM.ecm $ ecosconfig tree $ make This creates the Redboot image (redboot.bin) under install/bin directory. This image can run from either SDRAM or flash. Note: You can change the board MACH-TYPE at this file: src/ecos/packages/hal/arm/mx27/ads/current/cdl/hal_arm_board.cdl

Continental Yocto Training Author:           Leonardo Sandoval Material: PDF Tutorial: i.MX Yocto Project: Freescale Yocto Project Tutorial Provided Virtual Machine Wandboard Dual Wandboard - Freescale i.MX6 ARM Cortex-A9 Opensource Community Development Board - BLOG Tasks: Task 1: Build and Boot your board in N-steps     1.    Create a new folder ($ mkdir conti-fsl-community-bsp)     2.    Follow all N-steps (from the tutorial, page 2) EXCEPT the baking     3.     Baking has been done for you, so assume that the bake is done!     4.    Flash:         conti-fsl-community-bsp $ cd         $ cd fsl-community-bsp/build         build $ dd if=tmp/deploy/images/core-image-minimal-wandboard-dual.sdcard of=/dev/sdb bs=1M         build $ sync # NEVER FORGET THIS STEP, You have been warned!     5.    Boot         Task 2:    Folders     1. Tree structure & size         fsl-comunity-bsp $ tree -d -L 2         fsl-comunity-bsp $ du -h --max-depth=2 Task 3:    Architecture Task 4:    Metadata Task 5:    Config files         build $ cat conf/local.conf         build $ cat conf/bblayer.conf Task 6:     Layers build $ bitbake-layers show-layers sources $ cat meta-fsl-arm/conf/layer.conf Task 7:    Adding an existing layer     1. Clone the repo sources $ git clone https://github.com/lsandoval/meta-fsl-test.git     2. Add the layer to build/bblayers.conf sources $ cd ../build build $ vi conf/bblayers.conf     3. Browse the new layer files     4. Compile the kernel build $ bitbake -f -c compile linux-wandboard build $ bitbake -c deploy linux-wandboard     5. Flash    build $ sudo mkdir /media/boot         build $ sudo mount /dev/sdb1 /media/boot         build $ cp tmp/deploy/images/uImage /media/boot         build $ sudo umount /media/boot     6. Boot Task 8: (Optional) Check the core-image-minimal-test image, bake and flash it. Run the 'helloworld' app Task 9: Q&A

RidgeRun provides a fully featured Embedded Linux Software Development Kit for Freescale iMX6 based applications processors. Freescale iMX6 platform delivers high performance, power efficient applications processors with a robust support network and software portfolio including open source. The complete platform allows for differentiation and rapid development of applications from wireless handsets to other multimedia-enhanced devices. The i.MX6 series processors are a scalable multicore platform that includes single-, dual- and quad-core families based on the ARM® Cortex™-A9 architecture. This architecture is a robust - cross industry and product platform. Whether your product is targeted at consumer electronics, industrial, automotive or security related, this flexible, scalable architecture combined with RidgeRun's easy-to-use SDK's and extension products allows you to concentrate your effort of differentiating features and not product infrastructure. FEATURES Boot loader 2013.07 Linux kernel 3.0.35-4.0.0 Gstreamer-0.10.36 Freescale gst-plugins 3.0.7 Hardware based audio and video codecs SD and NFS file system support Boot from SD3, SD4 or SPI-NOR with an easy installation (Boundary devices boards only) Toolchain to linaro 2012.03 for software floating point and 2013.03 for hardware floating point support For more info please contact: [email protected] or Please Click -> Contact Us

The i.MX27 Application Development System (MCIMX27ADSE) is a development tool which is designed to run software applications designed for the i.MX27 processor. Features i.MX27 Multimedia Application Processor Two clock-source crystals, 32 KHz and 26 MHz Power management & Audio IC (MC13783) included battery charging, 10bit ADC, buck switchers, boost switcher, regulators, amplifiers, CODEC, SSI audio bus, real time clock, SPI control bus, USB OTG transceiver & touchscreen interface Multi-ICE debug support Two 512Mbit DDR-SDRAM devices, configured as one 128MB, 32-bit device One 256Mbit Burst Flash with 128Mbit Pseudo Static RAM (PSRAM) memory device, configured as one 16MB flash with 8MB PSRAM, 16-bit device An single board system with connections for LCD display panel, Keypad and Image sensor. Complex Programmable Logic Device (CPLD) for reducing glue logic interface Software readable board revisions Configuration and user definable DIP switches Two SD/MMC, MS memory card connectors PCMCIA & ATA Hard Disk Drive (HDD) Two RS-232 transceivers and DB9 connectors (one configured for DCE and one for DTE operation) supporting on-chip UART ports External UART with RS-232 transceiver and DB9 connector Infrared transceiver that conforms to Specification 1.4 of the Infrared Data Association USB Host (HS & FS), USB OTG (HS & HS) interface Separate LCD panel assembly that connects to the main board Separate keypad unit with 36 push button keys Separate CMOS Image Sensor Card A 3.5 mm headset jack, a 3.5 mm line out jack, a 3.5 mm line in jack, a 3.5 mm microphone jack and a 2.5 mm microphone and headset jack Cirrus Logic CS8900A-CQ3Z Ethernet controller (10BASE-T), with RJ-45 connector AMD AM79C874 NetPHY (10BASE-T & 100BASE-X), with RJ-45 connector Two 32 × 3-pin DIN expansion connectors with most i.MX27 I/O signals Variable resistor for emulation of a battery voltage level NAND Flash card (Plugs into Main Board) which is included in the ADS kit LED indicators for power, Ethernet activity, and two LEDs for user defined status indication Universal power supply with 5 volt output @ 5 Amperes USB, RS-232 and RJ45 cables available in kit Kit Contains a main board an LCD display panel a keypad a NAND flash card an image sensor a TV encoder card, etc It supports application software, target-board debugging or optional extra memory.

File related to the following question: MX53 u-boot Splash Screen support

In Chinese Twitter: Sino Weibo, one famous distributor mentioned “i.MX28 is the best choice in ARM9 core-based processor, no ‘one of’”. With high integration of analog module and digital module, i.MX28 is attracting more and more engineers in various applications. Despite its advantage, there are some mistakes one may commit or issues they may meet. The note records a number of issues/mistakes. Each case in the note comes from a real story. I hope the note will help you in your development work. And It is definitely welcomed for everyone to add your own content to the note.The more you share, the more you get.

Question: How is mx6 PMIC_ON_REQ under SW control? mx6 PMIC_ON_REQ is hooked up to the PFUZE100's PWRON and Linux and our 3.0.35bsp is used. Mx6 SW control is to drive the PMIC_ON_REQ pin low.  It appears from the documentation that this pin can be controlled by either another imx6 pin OR through SW control. The issue is that the reference manual is not clear on how to do this. While doing an SR search (SR 1-877711457), it does appear the PMIC_ON_REQ is controlled by SW. Answer: In latest RM version, Figure 60-3. Chip on/off state flow diagram and Table 60-3. Power mode transitions in IMX6DQRM.pdf show two ways to make PMIC_ON_REQ go low. I'm sure in latest BSP SW method had been included. It turns out the SNVS module on the mx6s/dl is different from the mx6q/d which is again different from the mx6slx. The bottom line is that the requirements for the SNVS functionality came primarily from the Android market so many of the Linux use cases are not supported. SW control of the PMIC_ON_REQ pin is an example of this. This means that you are correct, there only 2 ways to get PMIC_ON_REQ to power up for the mx6q/d 1 -  a low on the ON/OFF pin greater than the debounce time (750ms) 2 - a wake-up/tamper event. For the mx6s/dl, there are 3 ways to get PMIC_ON_REQ to power up 1 - power-on-reset on the VSNVS  (i.e first applying VSNVS) 2 -  a low on the ON/OFF pin greater than the debounce time (750ms) 3 - a wake-up/tamper event. Note, in my case, where there is an external input that actually wakes up the system, turns on the PMIC and brings up the mx6 there is only 1 way to get PMIC_ON_REQ to go back high 1 - a low on the ON/OFF pin greater than the debounce time (750ms) As it turns out, when the VSNVS_HP section is powered (i.e VDDHIGH is applied), it gates off the wake-up timer.

       Overview The purpose of this document is to describe how to enable Bluetooth on i.MX 6Dual/Quad SabreSD board (RevC) for Android software. Hardware Changes i.MX 6Dual/Quad SabreSD board doesn't enable Bluetooth connection by default. To support bluetooth, the hardware rework is required. The above diagram shows the reserved connections for Bluetooth in SabreSD RevC board (All connections are marked as "DNP"). This Bluetooth cable connector is designed specifically for the WiFi/BT combo card SX-SDCAN-2830BT which is developed and sold by Silex Technology. Note that pin 1 (BT_DISABLE) of the cable connector on i.MX 6Dual/Quad SabreSD RevC is opposite Pin 20 of the WiFi/BT module. Note: when connecting Silex module and J13, the connection is reverted (For example, PIN 1 in J13 connects to PIN 20 in Silex module). To use the J13 connector, the following reworks are required:   R209-R211, R214-R215 need to be populated.           Where is them, you can refer to the below chart.   SPI nor flash U14 need to be depopulated. No other AUX boards should be connected.. Exchange UART5_RXD and UART5_TXD. Orange PAD connects to Orange PAD. Green PAD connects to Green PAD.      After hardware rework, the Bluetooth connection will like the following:   Pin on Silex Module Sabresd Board Mux Pad Pin-2  BT_UART_RTS  (output) UART5.RTS   (input) MX6Q_PAD_KEY_COL4__UART5_RTS Pin-3  BT_UART_TXD   (output) UART5.RXD   (input) MX6Q_PAD_KEY_ROW1__UART5_RXD Pin-4  BT_UART_CTS   (input) UART5.CTS   (output) MX6Q_PAD_KEY_ROW4__UART5_CTS Pin-5  BT_UART_RXD   (input) UART5.TXD   (output) MX6Q_PAD_KEY_COL1__UART5_TXD Pin-14  BT_PWD_L       (input) GPIO_2         (output) MX6Q_PAD_GPIO_2__GPIO_1_2   Software Information For earlier android version before Jelly Bean4.2 Take ICS as an example, for we didn't do this work when our last ICS version R13.4.1 released. So our formal release had no support on BT. Here will give out patches based on R13.4.1. Enable Bluetooth with the following setting (e.g. device/fsl/imx6/sabresd/init.rc)      # No bluetooth hardware present -    setprop hw.bluetooth 0 +    setprop hw.bluetooth 1 Ensure BOARD_HAVE_BLUETOOTH := true in device/fsl/imx6/sabresd/SabreSDBoardConfigComm.mk. Add BT feature support in device/fsl/imx6/sabresd/required_hardware.xml: <permissions>      <feature name="android.hardware.camera" /> +    <feature name="android.hardware.bluetooth" />   Add UART5 support in kernel: In this step you can refer to the attached (kernel patch for UART5 based on ICS.zip) to change PinMux PAD configuration for UART5.   Add AR3002 BT firmware support: Update external/linux-firmware with the attached patch(0001-ENGR00270791-BT-add-AR3002-firmware-support.patch) to add AR3002 BT firmware support for Silex's BT is AR3002.   Then you can manually run the command “hciattach -n -s 115200 /dev/ttymxc4 ath3k 115200 flow nosleep” in console to see whether bluetooth can attach HCI successfully.   At last, you need add rfkill for BT reset in kernel, here also give a patch for reference: 0001-ENGR00270791-BT-add-rfkill-for-bt-reset.patch   BT is not enable in kernel default. You can control whether to enable it in bootargs like the following  in device/fsl/sabresd_6dq/BoardConfig.mk. BOARD_KERNEL_CMDLINE := console=ttymxc0,115200 init=/init video=mxcfb0:dev=ldb,bpp=32 video=mxcfb1:off video=mxcfb2:off fbmem=10M fb0base=0x27b00000 vmalloc=400M androidboot.console=ttymxc0 androidboot.hardware=freescale  bluetooth For android version since Jelly Bean4.2 From Jelly Bean4.2, Bluez is no longer used.Android provides a default Bluetooth stack, BlueDroid, that is divided into two layers: The Bluetooth Embedded System (BTE), which implements the core Bluetooth functionality and the Bluetooth Application Layer (BTA), which communicates with Android framework applications. A Bluetooth system service communicates with the Bluetooth stack through JNI and with applications through Binder IPC. The system service provides developers access to various Bluetooth profiles. The following diagram shows the general structure of the Bluetooth stack: For bluedroid, we have supported it in our formal release including Android4.3. You can get it from our website. Or just get HAL code from attached(libbt-ath3k.zip). Known issue For  KEY_COL4 is both used by uart5 and pcie,  if you enable BT, 3G  mobile will not work. For its power disable pin is conflict with uart5's UART_RTS. This is also why we didn't enable BT in formal release. Supported and tested profile workable profile not tested profile Hid Handset & Handfree(not support for hardware restrict) A2DP Pbap Opp Pan

Tel Aviv, December 2013   Variscite announces the support of Yocto over its iMX6 System-on-Modules   Variscite, a leading manufacturer of embedded solutions and System-on-Modules and Freescale’s Connected Partner, is pleased to announce the support of Yocto v4.1 Dora release over all Variscite’s iMX6 embedded products. Variscite develops, produces and manufactures a powerful range of System-on-Modules (SoM) and Single-Board-Computers (SBC), consistently setting market benchmarks in terms of speed and innovation. Today Variscite’s cost sensitive high performance portfolio serves over a thousand c ustomers in over 50 countries worldwide. The Yocto project was announced in 2010 to enable the creation of Linux distributions for embedded software that are independent of the underlying architecture of the embedded software itself. Variscite’s support of Yocto over its iMX6 solutions aligns with the company’s strategy to provide its customers with a complete set of leading embedded software and hardware solution, reducing development risk, cost and time-to-market. Variscite’s Yocto v4.1 Dora release supports iMX6 Solo, Dual Lite, Dual and Quad processors with a variety of speed grades, memory sizes and interfaces. More information can be found in: http://www.variwiki.com/index.php?title=Yocto_V4.1_Dora#Supported_hardware_and_features   About Variscite:   In less than a decade Variscite has taken a leading position in the System-on-Modules (SoM) design and manufacturing market. A trusted provider of development and consulting services for a variety of embedded platforms, Variscite transforms clients’ visions into successful products. Learn more about Variscite by visiting: www.variscite.com or contacting: Variscite Sales, [email protected] , +972-9-9562910

The ARD has the VGA output hw multiplexed with the on board Eth controlling, on jumpers J14 and J16. If using the VGA out one option for network is to use an USB/Eth adapter. To enable this (tested on BSP 11.05 - 2.6.35): 1. Find out the driver for the adapter you are using. You can connect it to your Linux host for that. $ lsusb ... Bus 002 Device 017: ID 0b95:772a ASIX Electronics Corp. ... $ dmesg | tail ... [3799653.662846] eth2: register 'asix' at usb-0000:00:1d.7-2, ASIX AX88772 USB 2.0 Ethernet, 00:60:6e:00:02:7a ... 2. Enable the driver on the target's kernel: - ./ltib -c - On Ltib menu, select "[*] Configure the Kernel" - On the kernel menuconfig select the driver, in this case: CONFIG_USB_NET_AX8817X located at: -> Device Drivers                                                       -> Network device support (NETDEVICES [=y])         -> USB Network Adapters             -> Multi-purpose USB Networking Framework (USB_USBNET [=y]) 3. Program the kernel to SD: sudo dd if=rootfs/boot/uImage of=/dev/sdd bs=512 seek=2k 4. Set U-boot to load the kernel from the SD and NFS: MX53-ARD-DDR3 U-Boot > set bootcmd 'run bootcmd_sd_nfs' MX53-ARD-DDR3 U-Boot > set bootcmd_sd_nfs 'run bootargs_nfs;run load_kernel;bootm' MX53-ARD-DDR3 U-Boot > set load_kernel 'mmc read 0 ${loadaddr} 0x800 0x1f00' Here you may change the ip from "dhcp" to a fixed address if you are connected directly to host. MX53-ARD-DDR3 U-Boot > set bootargs_nfs 'set bootargs console=ttymxc0,115200 root=/dev/nfs ip=dhcp nfsroot=${serverip}:${nfsroot},v3,tcp' MX53-ARD-DDR3 U-Boot > set serverip 192.168.2.100 MX53-ARD-DDR3 U-Boot > set nfsroot '/tftpboot/rootfs_ard' MX53-ARD-DDR3 U-Boot > save Saving Environment to MMC... Writing to MMC(0)... done 5. Connect the USB/Eth adapter to the USB port (USB1-J30 or USB2-J31). Instructions to setup the host for NFS can be found on the following page: All Boards NFS.

The i.MX21 Application Development System (MCIMX21ADSE) is a development tool which is designed to run software applications designed for the i.MX21 processor. Features   i.MX21 Processor   Two clock-source crystals, 32.768 KHz and 26 MHz   Power connector for +5.0-volts in from an external, regulated power supply, an in-line fuse, and a power on/off switch.   Voltage regulators that step down the 5.0-volt input to Vcc (3.0-volts), 2.5-volts, 1.8-volts, and 1.5-volts.   Multi-ICE debug support   Two 8M × 16-bit Burst Flash memory devices, configured as one 32MB, 32-bit device   Two 16M × 16-bit SDRAM devices, configured as one 64MB, 32-bit device   High speed expansion connectors for optional add on cards   Two-board system: modular CPU board plugs into Base board; Base board has connections for LCD display panel and keypad and TV encoder card   Memory mapped expansion I/O   Configuration and user definable DIP switches   SD/MMC memory card connector   Two RS232 transceivers and DB9 connectors (one configured for DCE and one for DTE operation) supporting on-chip UART ports   External UART with RS232 transceiver and DB9 connector   IrDA transceiver that conforms to Specification 1.4 of the Infra-red Data Association   USB OTG (On The Go) interface transceiver and USB mini AB connector   Separate LCD panel assembly with a ribbon cable that connects to the Base board and interfaces directly with the M9328MX21ADS   Touch panel controller for use with the LCD   Separate Keypad unit with 36 push button keys   Separate CMOS Image Sensor Card   Audio CODEC includes an 11.28MHz crystal oscillator, a 3.5mm audio input jack, a 3.5mm microphone jack, and a 3.5mm headphone jack   Cirrus Logic CS8900A Ethernet controller, with RJ-45 connector for connecting to a system hub   Two 32 × 3-pin DIN expansion connectors with most i.MX21 I/O signals   Variable resistor for emulation of a battery voltage level   NAND Flash card (Plugs into CPU)   LED indicators for power, external bus activity, Ethernet activity, and two LEDs for user defined status indiction   Universal power supply with 5.0-volt output @ 2.4A   USB cable   RS232 serial cable   Two RJ-45 Ethernet cables, network and crossover

   Recently, some customers encountered the problem that compilation failed when compiling l4.14.98-2.0.0 fsl-imx-waylan + fsl-image-qt5-validation-imx in Ubuntu 18.04 environment. In fact, compiling QT image is a very time-consuming process, especially in the process of compiling, errors need to be handled, which will be more time-consuming. The following compilation took four days to complete. 1. Environment Linux Host : ubuntu 18.04 LTS Virtual Machine: VMware workstatin Player 12 images: fsl-imx-waylan + fsl-image-qt5-validation-imx Hardware: imx8mqevk Linux BSP verison: L4.14.98-2.0.0 2. Steps (1)Installation of Ubuntu 18.04 2.Update software 3. Installing software package for compiling BSP # 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 zlib1g-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 # sudo apt-get install device-tree-compiler # sudo apt-get install aptitude # sudo aptitude install libcurl4-openssl-dev nss-updatedb   From i.MX_Yocto_Project_User's_Guide.pdf: # sudo apt-get install gawk wget git-core diffstat unzip texinfo gcc-multilib \ build-essential chrpath socat libsdl1.2-dev   4. Downloading Yocto BSP according to steps in i.MX_Yocto_Project_User's_Guide.pdf 5．Compiling L4.14.98-2.0.0 BSP # cd ~/imx-yocto-bsp # DISTRO=fsl-imx-wayland MACHINE=imx8mqevk source fsl-setup-release.sh -b build-wayland # bitbake fsl-image-qt5-validation-imx In the process of compilation, there have been many "fetch errors", which are caused by disconnection or timeout of network connection. We just need to run the bitmake command again in the build Wayland subdirectory to continue the compilation. # bitbake fsl-image-qt5-validation-imx          Fetching errors below were what I encountered:          The following picture is to re-run “bitbake fsl-image-qt5-validation-imx” after fetch errors occurred.          In order to improve the speed of compilation , I re-configured vmware player, assigning 6 CPU cores for Ubuntu.          Compilation is a long and arduous process. It took 4 days to compile normally with error handling. Finally, the compilation was completed. NXP TIC Team Weidong Sun 2019-11-02

The D-PHY PLL (in the red circle in the picture below) is the PLL that drives the MIPI Clock lane. It must be set in accordance with the video to be sent to the display.   Calculating the video bandwidth The video bandwidth is calculated with the following equation: Pixels per second = Horizontal res. x Vertical res. x Frame rate x Bits per pixel Taking as example the 1080p60 OLED display RM67191: Pixels per second = 1920 x 1080 x 60 x 24 Pixels per second = 2985984000 = 2,98Gpixels/sec Pixel clock calculation The Display pixel clock can be obtained on the display driver. In this example for RM67191, the pixel clock is 132Mpixel/sec, see file: panel-raydium-rm67191.c\panel\drm\gpu\drivers - linux-imx - i.MX Linux kernel  Line 530: .pixelclock = { 66000000, 132000000, 132000000 }, Or the number can be obtained with the following equation: pixel clock = (hactive + hfront_porch + hsync_len + hback_porch) x (vactive + vfront_porch + vsync_len + vback_porch) x frame rate pixel clock = (1080 + 20 + 2 +34) × (1920 + 10 + 2 + 4) x 60 pixel clock = 132000000 (rounded up) Bit clock calculation (clock lane) The mipi-dphy bit_clk is the output clock and is calculated on file sec-dsim.c (line 1283): sec-dsim.c\bridge\drm\gpu\drivers - linux-imx - i.MX Linux kernel  Bit clock can be calculated with the following equation: bit_clk = Pixel clock * Bits per pixel / Number of lanes In the case of 1980p60 (Raydium display), It is:   bit_clk = pixel clock * bits per pixel / number of lanes bit_clk = 132000000 * 24 / 4 bit_clk = 792000000 Other important timing parameters like 'p', 'm', 's' are obtained on the table in the following header file: sec_mipi_dphy_ln14lpp.h\imx\drm\gpu\drivers - linux-imx - i.MX Linux kernel 

The ads7846 driver that is distributed with yocto 1.6 (Daisy, Linux 3.10.17) does not support device tree configuration hooks. Attached is a patch for the ads7846 touchscreen driver to support device tree. Also added to the driver are hooks to ignore the requirement for a voltage regulator configuration.

Here is a quick summary at booting a Linux system on the i.MX 6 Sabre SD platform, through USB. This assumes you have a "working" Linux development environment at hand (e.g. Debian), and that your are able to build a working Linux system with buildroot already, as explained in this post. You will also need libusb-1.0 development files (headers and libraries), as well as root/sudo permissions to access USB peripherals. Also, we will use the fine imx_usb_loader tool that the nice folks at Boundary Devices have developed for their i.MX 5/6 boards, as it works fine for Sabre sd as well. Get buildroot sources We will use git to fetch buildroot sources: $ git clone git://git.busybox.net/buildroot This should create a buildroot directory with all the latest sources (after a while). Note that for more stability you might want to checkout a release instead of the latest version; to do so, list the available release tags with e.g. git tag -l '201*', and git checkout <the-desired-tag>. Compile buildroot The beauty of buildroot is that it will take care of everything for you, including preparing a cross compiler. You can configure buildroot for Sabre SD by doing: $ cd buildroot $ make freescale_imx6sabresd_defconfig By default this would generate binaries suitable for booting with an SD card, so we need to tweak a few settings to obtain a ramdisk, which u-boot will like. Summon the configuration menu with the following command: $ make menuconfig Descend into the "Filesystem images" submenu, and select the following buildroot options: cpio the root filesystem (for use as an initial RAM filesystem) Compression method (gzip) Create U-Boot image of the root filesystem Exit, saving your configuration. You might want to verify that you have indeed the the correct options in your .config: $ grep '^BR2_TARGET_ROOTFS_CPIO' .config This should return the following: BR2_TARGET_ROOTFS_CPIO=y BR2_TARGET_ROOTFS_CPIO_GZIP=y BR2_TARGET_ROOTFS_CPIO_UIMAGE=y You may then proceed with the build: $ make This should download and build everything, so it will take a while. Note that, as bryanthomas pointed out, there are no files for the sabre sd in the boards folder. This is because no patches or custom kernel configurations are needed outside of what is defined in the defconfig. So the only place the sabre sd board lives in buildroot is in the configs directory. At the time of writing we still need a small final hack to have Linux boot on /init instead of its default /linuxrc for proper boot on ramdisk, though. Hopefully this should be addressed in a future buildroot version, and a patch is on his way, but for now we change the boot script in our target filesystem with: $ cd output/target $ ln -svf init linuxrc $ cd ../.. $ make All build results will fall under the output/images folder. We are most interested in the following pieces: output/images/ +- imx6q-sabresq.dtb +- rootfs.cpio.uboot +- u-boot.imx `- uImage Get imx_usb_loader sources We will use git to fetch imx_usb_loader sources: $ git clone git://github.com/boundarydevices/imx_usb_loader.git This should create an imx_usb_loader directory with all the latest sources. Compile imx_usb_loader Assuming your Linux development environment has the necessary libusb-1.0 headers and libraries, you can simply build by doing: $ cd imx_usb_loader $ make This should compile an imx_usb tool in the current folder. Prepare your payload and configuration First, copy all the necessary buildroot generated items to the imx_usb_loader directory. You will need: u-boot.imx uImage imx6q-sabresd.dtb rootfs.cpio.uboot Now we need to explain to imx_usb what we want to download to the i.MX romcode through USB. Add the following lines in the end of the mx6_usb_work.conf: ... u-boot.imx:dcd,plug uImage:load 0x12000000 rootfs.cpio.uboot:load 0x12C00000 imx6q-sabresd.dtb:load 0x18000000 u-boot.imx:clear_dcd,jump header The first line with dcd, plug uses u-boot header to configure the DDR3 memory, allowing us to download contents to the Sabre SD memory. This is exactly what the three subsequent lines with load directives do. The last line re-uses u-boot one more time to find out the address where to jump (jump header directive), but not touching the DDR configuration any more thanks to the clear_dcd directive (thanks jeanmariepons-b46892 for the tips) . Look at the comments in mx6_usb_work.conf for (a bit) more details on the various directives available. Also, note that all the absolute addresses mentioned above are what u-boot needed at the time of writing. Hopefully this should be fairly stable. Boot through USB! We are all set for booting now. Connect to the USB to UART port with a serial terminal set to 115200 baud, no parity, 8bit data. Connect also your PC to the USB OTG port of the Sabre SD, and make sure you have no SD card inserted and power up the platform. The Sabre SD should not boot into an operating system, but rather wait for a payload to download through USB. You might want to verify that it is indeed waiting with the following command: $ lsusb In the resulting output, there should be a line like the following: Bus 001 Device 098: ID 15a2:0054 Freescale Semiconductor, Inc. i.MX 6Dual/6Quad SystemOnChip in RecoveryMode On your PC, start the download of our "payload" to your Sabre SD with: $ sudo ./imx_usb (Note that you need proper permissions to do that.) After download of all the pieces, u-boot should start in its "mfgtools mode", as reflected by the following messages on UART: ... Boot from USB for mfgtools Use default environment for mfgtools Run bootcmd_mfg: run mfgtool_args;bootm ${loadaddr} ${initrd_addr} ${fdt_addr}; ... The Linux kernel should then start, and your buildroot system should reach a prompt: ... Welcome to Buildroot buildroot login: From there you may login as root. Enjoy! See also... This post details the buildroot steps a bit more. This post explains how to build a ramdisk for i.MX6 with busybox directly. AdeneoEmbedded - Whitepaper on USB loader for i.MX6 platforms imx_usb_loader README on github Buildroot: making embedded Linux easy