Installing the new release (Ubuntu 22.04) was detected some NXP boards as iMX8MNEVK, iMX8MM-EVK, iMX8MP-EVK and iMX8ULP-EVK had an issue with the WIFI module that basically it does not initialize at boot. Remember, the supported WIFI modules in Ubuntu 22.04 in the EVKs are the following:       • NXP 88W8987       • NXP 88W9098       • NXP 88W8997       • NXP IW416       • NXP 88W8801       • NXP IW612 To initialize the WIFI module of NXP EVKs in Ubuntu 22.04 you can set the following command in console:   sudo modprobe moal mod_para=nxp/wifi_mod_para.conf   That command find the correct driver for our WIFI module and then initialize it, but this only works when Ubuntu is working and if you reset the EVK you need to set the command again.   The definitive solution is create a custom startup script as a service:   Step 1: Go to etc/systemd/system   cd etc/systemd/system   Step 2: In this directory create a new file with the name of your preference but the extension must be .service. You can do it with nano or vim: sudo nano or sudo vim   The file must contain: [Unit] Description=”Wifi Start” [Service] ExecStart=sudo modprobe moal mod_para=nxp/wifi_mod_para.conf [Install] WantedBy=multi-user.target   Now save the file, in my case the name was wifi_start.service.   Step 3: Now we need to enable the script in the startup/boot sequence following the command: sudo systemctl enable wifi_start.service   Remember in wifi_start.service is the name as you saved your file.   Finally, each time you boot your board, the WIFI module will initialize automatically.   Boards tested: iMX8MN (With WIFI module NXP 88W8987) iMX8MM (With WIFI module NXP 88W8987) iMX8MP (With WIFI module NXP 88W8997) iMX8ULP (With WIFI module NXP IW416)  

In this article, I will explain how to set up the iMX8M Plus to use the 4K Dart BCON Basler Camera module. Requirements: Evaluation Kit for the i.MX 8M Plus Applications Processor. (i.MX 8M Plus Evaluation Kit | NXP Semiconductors) Basler Camera for i.MX 8M Plus (4K dart BCON for MIPI camera module for i.MX 8M Plus | NXP Semiconductors). Embedded Linux for i.MX Applications Processors (Embedded Linux for i.MX Applications Processors | NXP Semiconductors) (For this example we will use BSP version Linux 5.15.71_2.2.0) Serial Console Emulator Basler Camera Specifications and Manuals: Basler Camera Specifications at this link: Embedded Vision Kits daA3840-30mc-IMX8MP-EVK - Embedded Vision Kits (baslerweb.com). Basler Manual to identify and setting up the hardware at this link: daA3840-30mc-IMX8MP-EVK | Basler Product Documentation (baslerweb.com) Basler Camera Module out-of-box with i.MX 8M Plus Applications Processor. (Video: Basler Camera Module out-of-box with i.MX 8M Plus Applications Processor | NXP Semiconductors) Steps After setting up the hardware we will need to turn on the iMX8M Plus and follow these steps: 1. Stop the boot process on Uboot by pressing any key. 2. Use the following command to list interfaces. => mmc list Output example => FSL_SDHC: 1 (SD) => FSL_SDHC: 2 The above command will show you the device number in this example for SD, the device number is 1. 3. Then use fatls <interface> <device[:partition]> [<directory>] fatls mmc 1:1 (Device 1 : Partition 1) With this command, we will be able to list device tree files. => fatls mmc 1:1 4. Select imx8mp-evk-basler.dtb or imx8mp-evk-dual-basler.dtb and use the command editenv fdtfile.  => editenv fdtfile Output example edit: imx8mp-evk-basler.dtb 5. In edit command line put the selected device tree (*.dtb). 6. Use saveenv command to save environment and continue with the boot process. 7. Using the terminal and go to /opt/imx8-isp/bin and execute the script run.sh. $ ./run.sh -c basler_1080p60 -lm 8. Use the command gst-device-monitor-1.0 to list devices. Here you will find the path to the camera device. $ gst-device-monitor-1.0 Output example Device found: name : VIV class : Video/Source caps : video/x-raw, format=YUY2, width=[ 176, 4096, 16 ], height=[ 144, 3072, 8 ], pixel-aspect-ratio=1/1, framerate={ (fraction)30/1, (fraction)29/1, (fraction)28/1, (fraction)27/1, (fraction)26/1, (fraction)25/1, (fraction)24/1, (fraction)23/1, (fraction)22/1, (fraction)21/1, (fraction)20/1, (fraction)19/1, (fraction)18/1, (fraction)17/1, (fraction)16/1, (fraction)15/1, (fraction)14/1, (fraction)13/1, (fraction)12/1, (fraction)11/1, (fraction)10/1, (fraction)9/1, (fraction)8/1, (fraction)7/1, (fraction)6/1, (fraction)5/1, (fraction)4/1, (fraction)3/1, (fraction)2/1, (fraction)1/1 } ... properties: udev-probed = true device.bus_path = platform-vvcam-video.0 sysfs.path = /sys/devices/platform/vvcam-video.0/video4linux/video2 device.subsystem = video4linux device.product.name = VIV device.capabilities = :capture: device.api = v4l2 device.path = /dev/video2 v4l2.device.driver = viv_v4l2_device v4l2.device.card = VIV v4l2.device.bus_info = platform:viv0 v4l2.device.version = 393473 (0x00060101) v4l2.device.capabilities = 2216693761 (0x84201001) v4l2.device.device_caps = 69206017 (0x04200001) gst-launch-1.0 v4l2src device=/dev/video2 ! ... 9. Finally, use gstreamer to verify proper operation. (With this gstreamer pipeline you will see a new window with the camera output. Then, just rotate the lens to acquire the correct focus) $ gst-launch-1.0 -v v4l2src device=/dev/video2 ! "video/x-raw,format=YUY2,width=1920,height=1080" ! queue ! imxvideoconvert_g2d ! waylandsink Basic description of Gstreamer Pipeline gst-launch-1.0 -v: The option -v enables the verbose mode to get detailed information of process. v4l2src device=/dev/video2: Select input device in this case the camera is on path /dev/video3. "video/x-raw,format=YUY2,width=1920,height=1080": Received format from camera. queue: This command is a buffer between camera recording process and the following image process, this command help us to interface two process and prevent blocking where each process has different speeds, in other words, when a process A is faster than process B. imxvideoconvert_g2d: This proprietary plugin uses hardware acceleration to perform rotation, scaling, and color space conversion on video frames. waylandsink : This command creates its own window and renders the decoded frames processed previously. 10. Result     I hope this article will be helpful. Best regards, Brian.

Hello everyone, We have recently migrated our Source code from CAF (Codeaurora) to Github, so i.MX NXP old recipes/manifest that point to Codeaurora eventually will be modified so it points correctly to Github to avoid any issues while fetching using Yocto. Also, all repo init commands for old releases should be changed from: $ repo init -u https://source.codeaurora.org/external/imx/imx-manifest -b <branch name> [ -m <release manifest>] To: $ repo init -u https://github.com/nxp-imx/imx-manifest -b <branch name> [ -m <release manifest>] This will also apply to all source code that was stored in Codeaurora, the new repository for all i.MX NXP source code is: https://github.com/nxp-imx For any issues regarding this, please create a community thread and/or a support ticket. Regards, Aldo.

Platform: i.MX8MP SW:Linux 5.4.70.2.3.0 On current linux BSP, PCIE driver does not support Hot-plug, customers wants to turn off PCIE device to save power, attached is guide. Remove PCIE device driver Suspend PCIE driver Turn off PCIE device power supply Turn on PCIE device power supply Resume PCIE driver Rescan PCIE device Load PCIE device driver

From Android 12, NXP use GKI(Generl kernel image) instead of NXP's kernel code.  This follow up Android ASOP standard. This article described that when customer use Android 12 and later version, they need to pay attention on GKI development, which is different with previous version.

PCIE IP on i.MX8MM and i.MX8MP is same, customer can follow PCIE test Application note to do compliance test, if eye diagram failed, they can fine turn corresponding regs below: iMX8MMRM.pdf IMX8MPRM.pdf GEN1:             GEN2:                 Related code in kernel Phy-fsl-imx8-pcie.c (kernel-source\drivers\phy\freescale)    3794      2020/11/4 static int imx8_pcie_phy_init(struct phy *phy) { ……          /* Configure TX drive level  */        writel(0x2d, imx8_phy->base + 0x404);          return 0; }   Thanks Lambert

This hands on is based on the evkmimxrt1170_pxp_lab_cm7.zip which is from https://community.nxp.com/t5/i-MX-RT1170-CAS-Training/PXP-Multiple-Files/ta-p/1178709 this hands on give an example to understand pxp basic concept like letterbox background color, rotation, ps buffer coordination definition, output buffer coordination definition more clear   No Roation This test is based on no rotation, so define as below #define LAB1_BIT_BLIT_NO_ROTATION This demo output is that the rabbit picture shows on the upper left corner of lcd, and the offset width and height is 100   #ifdef LAB1_BIT_BLIT_NO_ROTATION     PXP_ps_bitblit(                    // input                    (void*)bmp_rabbit,                    PIXEL_BYTES,                    BMP_RABBIT_WIDTH,                    BMP_RABBIT_HEIGHT,                      // output                    s_BufferLcd[curLcdBufferIdx],                    DEMO_PANEL_WIDTH,                    DEMO_PANEL_HEIGHT,                    100,  // output offset x                    100,  // output offset y                    kPXP_No_Rotate); #endif       in this lab sample code, the background is set to black, PXP_SetProcessSurfaceBackGroundColor(APP_PXP, 0U);   The output is     If we want to set the background to lighter blue, this is what I want to get     then I modify the code to PXP_SetProcessSurfaceBackGroundColor(APP_PXP, 0xFFF0U);   But we get the same output like, without any difference         Check the code, find that the original code   void PXP_ps_sub_region_bitblit(…) { …..     outputBufferConfig.width = sub_region_width;     outputBufferConfig.height = sub_region_height;   …… }   This means that the output buffer width and height are the same as the picture width and height, so whatever background color you set, you couldn’t find anything difference, then change the output buffer width and height is the same as lcd width and height     void PXP_ps_sub_region_bitblit(…) { …..       outputBufferConfig.width = output_width;       outputBufferConfig.height= output_height;   …… }   Then the output change to     We can find the color on the top of display is still black and this isn’t what I need, still tracing the code   void PXP_ps_sub_region_bitblit(…) { …..  // Output buffer  outputBufferConfig.buffer0Addr   =  (uint32_t)output_buffer + output_offset_y * output_width * pic_bytes_per_pixel + output_offset_x * pic_bytes_per_pixel …… }   output_buffer is defined as lcd buffer start address, here the output buffer start address isn’t defined as lcd buffer start address(output_buffer), this is offset of lcd buffer start address, so change it like   void PXP_ps_sub_region_bitblit(…) { …..  // Output buffer  outputBufferConfig.buffer0Addr = (uint32_t)output_buffer …… }   Then the output is like       The output picture move to the upper left corner without offset, but this demo defines the offset is 100   void PXP_ps_sub_region_bitblit(…) { …..  // PS buffer PXP_SetProcessSurfacePosition(APP_PXP,0,0,BMP_RABBIT_WIDTH - 1U, BMP_RABBIT_HEIGHT - 1U); ….. }   In the original code, the PS buffer offset is 0, because the ps buffer start address is the same as the output buffer start address, and output buffer start address is offset + lcd output buffer start address, so set the PS output offset is 0, but I change the output buffer start address is the same as lcd buffer start address, so change the code   void PXP_ps_sub_region_bitblit(…) { …..             uint32_t psUlcX         = output_offset_x;             uint32_t psUlcY         = output_offset_y;             uint32_t psLrcX, psLrcY;             psLrcX = psUlcX   +  sub_region_width  - 1U;             psLrcY = psUlcY + sub_region_height- 1U;         // PS buffer         PXP_SetProcessSurfacePosition(APP_PXP,psUlcX,psUlcY,psLrcX,psLrcY); ….. }   The output is   \   Now this is what we need     Roation Set Macro to #define LAB2_BIT_90_DEGREE_ROTATION   The output is     When rotation is 90 degree and width is wider than the output height, the display part will be cut, so change the code from Before void PXP_ps_sub_region_bitblit(…) { …..       outputBufferConfig.width = output_width;       outputBufferConfig.height= output_height; ….. }   To   void PXP_ps_sub_region_bitblit(…) { …..  if  (rotate == kPXP_Rotate90)  {     outputBufferConfig.width          = output_height;        /*Joan*/     outputBufferConfig.height         = output_width;         /*Joan*/  } else {         outputBufferConfig.width          = output_width;         /*Joan*/         outputBufferConfig.height         = output_height;        /*Joan*/ }….. }   Because this demo only shows no rotation and 90 degree rotation, if customer needs 270 degree, 180 degree, can add by themselves

i.MX8 VPU hardware decoder support below video codec: H.265 HEVC Main Profile 4Kp60 Level 5.1 H.264 AVC Constrained Baseline, Main and High profile H.264 MVC WMV9 / VC-1 Simple, Main and Advanced Profile MPEG 1 and 2 Main Profile at High Level AVS Jizhun Profile (JP) MJPEG4.2 ASP, H.263, Sorenson Spark Divx 3.11, with Global Motion Compensation (GMC) ON2/Google VP6/VP8 RealVideo 8/9/10 JPEG and MJPEG A/B Baseline   i.MX8 VPU Linux driver is implemented based on V4L2 standard. Chromium beside software video decoding, it also support hardware video decoder(VideoDecodeAccelerator),  there are some kind of VideoDecodeAccelerator, one of them is V4L2VDA. Please note V4L2VDA is using V4l2 api, so it is possible that change V4L2VDA to enable Chromium hardware video playback on i.MX8.   This doc share patch to add chromium video decode accelerate by using i.MX8QM/i.MX8QXP VPU. It will support chromium H.264, H.265, VP8 hardware video decode. H.264 and H.265 need use mp4 container. VP8 use webm container.   HW: i.MX8QM/i.MX8QXP MEK board, 1080P HDMI display, mouse, keyboard SW: i.MX8 5.10.72_2.2.2 yocto bsp release(which included chromium 91.0), and patch in this doc   Patch description: imx8-5.10.72-vpudrv-update.diff, update i.MX8  5.10.72_2.2.2 kernel vpu driver to https://source.codeaurora.org/external/imx/linux-imx/commit/drivers/mxc/vpu_malone?h=lf-5.15.y&id=fa7c67e2c9ed4fb8392fa258f931d6996339a17a chromium-ozone-wayland_91.0.4472.114.bb.diff, change meta-browser/meta-chromium/recipes-browser/chromium/chromium-ozone-wayland_91.0.4472.114.bb for adding some compile flags, etc. 5.10.72-merge.patch, this patch change chromium source code to add video decode accelerate by using i.MX8 VPU.   Build steps: 1>Download i.MX8 5.10.72_2.2.2 yocto release from nxp.com 2>apply chromium-ozone-wayland_91.0.4472.114.bb.diff to change meta-browser/meta-chromium/recipes-browser/chromium/chromium-ozone-wayland_91.0.4472.114.bb 3>put 5.10.72-merge.patch to folder path_of_yocto-5.10.72-2.2.2/sources/meta-browser/meta-chromium/recipes-browser/chromium/files/ 3>apply imx8-5.10.72-vpudrv-update.diff to i.MX8 5.10.72_2.2.2 kernel 4>under the yocto image build folder, add "CORE_IMAGE_EXTRA_INSTALL += "chromium-ozone-wayland" to file path_of_yocto-5.10.72-2.2.2/folder-of-bld/conf/local.conf 5>run bitbake to build rootfs image   Test steps: After system boot up, put some video clip under /home/root/video then run below cmd (do not run chromium without any parameter, as that will start chromium with some other setting, you can check /usr/lib/chromium/chromium-wrapper) "/usr/lib/chromium/chromium-bin   --no-sandbox --ozone-platform=wayland --enable-features=VaapiVideoDecoder  --enable-accelerated-video-decode   --enable-clear-hevc-for-testing --ignore-gpu-blacklist --window-size=1920,1180  /home/root/video" then use mouse to click video clip and will start playback.   Reference: https://www.nxp.com/products/processors-and-microcontrollers/arm-processors/i-mx-applications-processors/i-mx-8-processors:IMX8-SERIES https://www.nxp.com/design/software/embedded-software/i-mx-software/embedded-linux-for-i-mx-applications-processors:IMXLINUX https://www.chromium.org/audio-video/#:~:text=codec%20and%20container%20support https://github.com/igel-oss/meta-browser-hwdecode/blob/master/recipes-chromium/chromium/files/0001-Add-support-for-V4L2VDA-on-Linux.patch      

1. Intro   This document contains instructions to run run the SAI low power audio demo on the i.MX 8M Plus EVK. Here, the  RPSMG to allows audio to be passed from the A53 cluster running Linux to the M7 core. The latter controls the on board WM8960 audio codec,  which is connected to a 3.5 mm audio jack that allow us to play music using headphones. I will show the necessary steps to make the demo work and will add some GStreamer examples to demonstrate the demo's capabilities.   TBD: update this with a nice diagram that depicts the A53 and M7 RPMSG channel. 2. Requirements   Hardware  MX 8M Plus EVK Headphones with 3.5 mm audio jack Type-C power supply for i.MX 8M Plus EVK Micro USB to USB adapter cable Software  A recent prebuilt Linux BSP image from NXP.com ( we tested this on 5.15.35 and 5.15.5 releases) Windows 10 or Ubuntu 20.04 Workstation MCUXpresso SDK for i.MX 8M Plus ( available from:  Welcome | MCUXpresso SDK Builder (nxp.com)) 3. Reference documentation for this example   MCUXpresso SDK   [1] Getting Started with MCUXpresso SDK for EVK-MIMX8MP     Available within the MCUXpresso SDK package:  \{INSTALL PATH}\SDK_X_X_X_EVK-MIMX8MP\docs    [2] SAI low power audio README file Contains instructions for the SAI Low Power Audio Demo.  Available within the MCUXpresso SDK package: \{INSTALL PATH}\SDK_X_X_X_EVK-MIMX8MP\boards\evkmimx8mp\demo_apps\sai_low_power_audio   4. Downloading a pre-built Linux BSP image for the i.MX 8M Plus   I will make use of the prebuilt Linux Image for the i.MX 8M Plus EVK for demonstrating the demo works.  At the moment of writing this time, I used the 5.15.32 release, although there are older releases like 5.10.5 that I tested and proved to work with no issues. This SAI Low Power Audio Demo shall work for other processors on the i.MX 8M family. Although specific instructions ( e.g. load address for M-core binary load) might require some adaptation. For M-core load address, please refer to the specific MCUXpresso SDK documentation for each processor. The prebuilt Linux image (5.15.32) for the i.MX 8M Plus EVK can be downloaded from here: https://www.nxp.com/webapp/Download?colCode=L5.15.32_2.0.0_MX8MP&appType=license You can download other releases from here: Embedded Linux for i.MX Applications Processors | NXP Semiconductors . Select a version and a board and select download. 5. Flashing the BSP image   If you are using an Ubuntu 20.04 workstation, I recommend you to flash the image using dd. For this, you can refer to the i.MX Linux User's Guide: Section - 4.3.2 Copying the full SD card image - https://www.nxp.com/docs/en/user-guide/IMX_LINUX_USERS_GUIDE.pdf sudo dd if=.wic of=/dev/sdx bs=1M && sync NOTE: when using dd, ALWAYS, double check the of device that you are about to writing. Messing up with another location or partition will harm your system   If you are following this document on a Windows machine: You can use the Universal Update Utility (UUU) to flash your image on either the board's eMMC or SD card. Document named UUU.pdf shall serve as your reference guide for further instructions and flashing examples. It is available along with UUU binary here: https://github.com/NXPmicro/mfgtools/releases Two examples are shown below for your convenience:                                     SD card flash                                                 uuu -b sd_all bootloader rootfs.sdcard.bz2                                     eMMC flash                                                 uuu -b emmc_all bootloader rootfs.sdcard.bz2        uuu uuu.auto NOTE: UUU is also compatible with Ubuntu NOTE: there are other engineers who like to use BalenaEtcher for flashing their BSP images. I have tested it and works on both Ubuntu and Windows 10 machines.   6. Preparing the BSP and booting up M7 core  using U-Boot   I am writing this upon the instructions contained on the README file for the low power audio example  [2]. Instructions ready to copy and paste will follow:   Instruct U-Boot to pass to the kernel the rpmsg device tree to enable communication between the A53 cluster and the M7 one: u-boot=>setenv fdtfile imx8mp-evk-rpmsg.dtb u-boot=>saveenv Load the M7 example: u-boot=>setenv mmcargs 'setenv bootargs ${jh_clk} console=${console} root=${mmcroot} snd_pcm.max_alloc_per_card=134217728' u-boot=>saveenv Now, we need to load the M4 with the demo. Refer to [1] for further information. If running the BSP on an SD card, make sure the example binary is listed on the boot partition as follows: fatls mmc 1:1 You shall see something similar to this:             imx8mp_m7_TCM_sai_low_power_audio.bin Open the serial terminal emulator for the M7. Out of the fourth ports listed when we plug the i.MX 8M Plus serial debug cable to the PC, the M7 is typically the last one listed.   All the serial ports available to the workstation when the i.MX 8M Plus serial cable is connected to it. NOTE: you may require to install addtitional COM drivers if you are running on Windows. I like doing the previous step so I can see the result of the next commands issued in U-boot to load the M7 image. fatload mmc 1:1 0x48000000 imx8mp_m7_TCM_sai_low_power_audio.bin; cp.b 0x48000000 0x7e0000 20000; bootaux 0x7e0000 Here is an screenshot that shows how the U-Boot's response should look: U-Boot response when loading the SAI low power audio example to the Cortex M7 That should have prompted the following message on the M7 terminal: M7-core is up!   Now, let’s move to user space! u-boot=> boot 7. Testing the example using a simple GStreamer pipeline   As soon as the O.S. finishes booting. We can see that M7 terminal prompts the following: M7 is now in STOP mode; waiting for some audio to beat the room! Confirm that the WM8960 is listed as audio card as follows: cat /proc/asound/cards             Listing avaialable audio cards. WM8960 should be present. Make note of the list. The wm8960 is listed a the third sound card. This is where I like to differ a bit from [2] and I suggest a quicker test in case of not having an audio file ready. We just simply use GStreamer to play an audiotest source. Please make sure to plug in your headphones onto the board’s 3.5 mm jack before.   The following GStreamer pipeline is using the WM8960 as an audiosink.  gst-launch-1.0 audiotestsrc ! alsasink device=hw:3   NOTE: please be cautious and not put the headphones directly in your head at the first attempt. The sound can be too loud to some people. This is what you should see on the M7 side: Stop the GStreamer pipeline issuing CTRL + C. M7 shall warn you about that: NOTE: you can use the aplay command to play audio as shown on [2]. However, I consider using a testsrc is much quicker and flexible for a quick test.  8. Additional information   Feel free to go ahead and tweak the GStreamer pipeline to change audio test source properties. audiotest src. This command will let you know the available options:            gst-inspect-1.0 audiotestsrc                         NOTE: you can navigate through the displayed list using the “d”key. Press “q’’ to quit. For example:     For example, I am reproducing sound using a different setup based on the list above: gst-launch-1.0 audiotestsrc freq=4000 volume=0.8 wave=8 ! alsasink device=hw:3 9.  Errata and future updates   TBD:     Add an example on how to define the default audio card and play the audio either using gst-play or building the pipeline using filesrc Comment on the limitations of the M7 core regarding sample rate and audio formats  

some industry customer to use i.MX8MM will use RMII to link the 100Mhz ethernet phy and wish to use our i.mx8mm output 50Mhz reference clock to external phy to save a crystal, this doc and patch explain how to support it. SW: Linux BSP 5.10.17. HW: i.MX8MM LPDDR/DDR EVK board. 中文版本为一个完整的如何支持一个100Mhz以太网PHY  

BSP: L5.15.5_1.0.0   Platform: i.MX8MPlus EVK   1. Parameter preparation For more parameter calculation, please refer to: https://community.nxp.com/t5/i-MX-Processors-Knowledge-Base/iMX-8M- Mini-Register-Programming-Aid-DRAM-PLL-setting/ta-p/111209  For 1866MHz LPDDR4, we need a DRAM PLL size of 933MHz. The PLL dividing parameters are: m=622,p=16,s=0, k=0.   2. Calibration and stress test with DDR Tool 2.1 Creating a test script for 1866MHz Here we copy the script from another file (e.g. 2000MHz) and modify the contents of the script.   2.2 Modify the script to adapt to 1866MHz 2.3 Download the test script After selecting the ddr script we created, click on the download button   2.4 Calibrating the stress test Set the core clock of the chip's cpu to 1.2GHz, then click the Calibration button to calibrate, then click Gen Code to generate the lpddr4_timing.c file. Set the start frequency to 1866MHz for the stress test.   2.5 Modify lpddr4_timing.c We need to modify the generated lpddr4_timing.c file to change the maximum speed to 3732MTS.   3. SPL patch After getting the correct lpddr4_timing.c file, the SPL code also needs to be modified to add support for the 933MHz DRAM PLL. diff --git a/arch/arm/mach-imx/imx8m/clock_imx8mm.c b/arch/arm/mach-imx/imx8m/clock_imx8mm.c index e39f238fdf...5622a6334e 100644 --- a/arch/arm/mach-imx/imx8m/clock_imx8mm.c +++ b/arch/arm/mach-imx/imx8m/clock_imx8mm.c @@ -55,6 +55,7 @@ static struct imx_int_pll_rate_table imx8mm_fracpll_tbl[] = { PLL_1443X_RATE(650000000U, 325, 3, 2, 0), PLL_1443X_RATE(600000000U, 300, 3, 2, 0), PLL_1443X_RATE(594000000U, 99, 1, 2, 0), + PLL_1443X_RATE(933000000U, 622, 16, 0, 0), PLL_1443X_RATE(400000000U, 400, 3, 3, 0), PLL_1443X_RATE(2660000U, 266, 3, 3, 0), PLL_1443X_RATE(167000000U, 334, 3, 4, 0), diff --git a/drivers/ddr/imx/imx8m/ddrphy_utils.c b/drivers/ddr/imx/imx8m/ddrphy_utils.c index 326b92d784..ebd005bc2b 100644 --- a/drivers/ddr/imx/imx8m/ddrphy_utils.c +++ b/drivers/ddr/imx/imx8m/ddrphy_utils.c @@ -117,6 +117,10 @@ void ddrphy_init_set_dfi_clk(unsigned int drate) dram_pll_init(MHZ(1000)); dram_disable_bypass(); break; + case 3732: + dram_pll_init(MHZ(933)); + dram_disable_bypass(); + break; case 3200: dram_pll_init(MHZ(800)); dram_disable_bypass();   4. Test results   Reference blog. DDR Tool: https://community.nxp.com/t5/i-MX-Processors-Knowledge-Base/i-MX-8M-Family-DDR-Tool-Release/ta-p/1104467  RPA: https://community.nxp.com/t5/i-MX-Processors-Knowledge-Base/i-MX-8MPlus-m865S-DDR-Register-Programming-Aids-RPA/ta-p/1235352 

Many customer set GPIO as input or output functions. While they are confused on how to set GPIO property. This article describe on GPIO property setting tips, especially that input and out property setting are different. 

Customer can force PCIE to work at GEN1/GEN2 mode if PCB layout is not good. Pls refer to: linux/Documentation/devicetree/bindings/pci/fsl,imx6q-pcie.txt:40:- fsl,max-link-speed: Specify PCI gen for link capability. Must be '2' for i.MX8M: diff --git a/arch/arm64/boot/dts/freescale/fsl-imx8mq.dtsi b/arch/arm64/boot/dts/freescale/fsl-imx8mq.dtsi index f4dcf7ac3c98..262db6f93cb2 100755 --- a/arch/arm64/boot/dts/freescale/fsl-imx8mq.dtsi +++ b/arch/arm64/boot/dts/freescale/fsl-imx8mq.dtsi @@ -1314,7 +1314,7 @@                     <&clk IMX8MQ_CLK_PCIE1_AUX>,                     <&clk IMX8MQ_CLK_PCIE1_PHY>;              clock-names = "pcie", "pcie_bus", "pcie_phy"; -            fsl,max-link-speed = <2>; +            fsl,max-link-speed = <1>;              ctrl-id = <0>;              power-domains = <&pcie0_pd>;              status = "disabled"; @@ -1344,7 +1344,7 @@                     <&clk IMX8MQ_CLK_PCIE2_AUX>,                     <&clk IMX8MQ_CLK_PCIE2_PHY>;              clock-names = "pcie", "pcie_bus", "pcie_phy"; -            fsl,max-link-speed = <2>; +            fsl,max-link-speed = <1>;              ctrl-id = <1>;              power-domains = <&pcie1_pd>;              status = "disabled"; diff --git a/drivers/pci/dwc/pci-imx6.c b/drivers/pci/dwc/pci-imx6.c index 54459b52f526..a63de7e7bae0 100644 --- a/drivers/pci/dwc/pci-imx6.c +++ b/drivers/pci/dwc/pci-imx6.c @@ -1548,6 +1548,7 @@ static int imx_pcie_establish_link(struct imx_pcie *imx_pcie)       u32 tmp;       int ret;   +    dw_pcie_dbi_ro_wr_en(pci);       /*        * Force Gen1 operation when starting the link.  In case the link is        * started in Gen2 mode, there is a possibility the devices on the   i.MX8/8x: fsl-imx8dx.dtsi pcieb: pcie@0x5f010000 {               /*               * pcieb phyx1 lane1 in default, adjust it refer to the               * exact hw design.               */ . . . . .               power-domains = <&pd_pcie>;               fsl,max-link-speed = <1>;         /* 3=gen3, 1=gen1 */               hsio-cfg = <PCIEAX2PCIEBX1>;               hsio = <&hsio>;               ctrl-id = <1>; /* pcieb */               cpu-base-addr = <0x80000000>;               status = "disabled";        };   pci-imx6.c @@ -1799,6 +1799,7 @@ static int imx_pcie_establish_link(struct imx6_pcie *imx6_pcie)      u32 tmp;      int ret;   +    dw_pcie_dbi_ro_wr_en(pci);      /*       * Force Gen1 operation when starting the link.  In case the link is       * started in Gen2 mode, there is a possibility the devices on the @@ -1870,11 +1871,13 @@ static int imx_pcie_establish_link(struct imx6_pcie *imx6_pcie)             dev_info(dev, "Link: Gen2 disabled\n");      }   +    dw_pcie_dbi_ro_wr_dis(pci);      tmp = dw_pcie_readl_dbi(pci, PCIE_RC_LCSR);      dev_info(dev, "Link up, Gen%i\n", (tmp >> 16) & 0xf);      return 0;    err_reset_phy: +    dw_pcie_dbi_ro_wr_dis(pci);      dev_dbg(dev, "PHY DEBUG_R0=0x%08x DEBUG_R1=0x%08x\n",             dw_pcie_readl_dbi(pci, PCIE_PORT_DEBUG0),             dw_pcie_readl_dbi(pci, PCIE_PORT_DEBUG1));

     The following steps allow you to build a bootable image in two different ways and also how to enable and use SCFW debug monitor. There are four files needed to generate a bootable image: ├── bl31.bin ├── u-boot.bin   ├── mx8qm-ahab-container.img     └── scfw_tcm.bin There are some ways to get the four files, one way is with Yocto and other way is with stand alone build. Get the four files needed to generate a bootable image with Yocto.   To get the four files needed with Yocto, you have to build an i.MX 8QuadMax image, maybe some steps are not necessary. 1.-Host packages. sudo apt-get install gawk wget git-core diffstat unzip texinfo gcc-multilib \ build-essential chrpath socat cpio python python3 python3-pip python3-pexpect \ xz-utils debianutils iputils-ping python3-git python3-jinja2 libegl1-mesa \ libsdl1.2-dev pylint3 xterm rsync curl 2.-Setting up the Repo utility. mkdir ~/bin (this step may not be needed if the bin folder already exists) curl https://storage.googleapis.com/git-repo-downloads/repo > ~/bin/repo chmod a+x ~/bin/repo export PATH=~/bin:$PATH 3.-Yocto Project Setup. git config --global user.name "Your Name" git config --global user.email "Your Email" git config --list mkdir imx-yocto-bsp cd imx-yocto-bsp repo init -u https://source.codeaurora.org/external/imx/imx-manifest -b imx-linux-hardknott -m imx-5.10.72-2.2.0.xml repo sync 4.-Build configurations. DISTRO=fsl-imx-xwayland MACHINE=imx8qmmek source imx-setup-release.sh -b imx8qmmek 5.-Building an image. bitbake imx-image-full The four files needed to generate a bootable image are in: ~/imx-yocto-bsp/imx8qmmek/tmp/deploy/images/imx8qmmek/imx-boot-tools Note: With Yocto you can not enable the SCFW debug monitor. For more information see the i.MX Yocto Project User's Guide. Get the four files needed to generate a bootable image with stand alone build.   To build all required binaries from source you can use standard aarch64 Linux toolchain, on Ubuntu 20.04 LTS: sudo apt-get install gcc-aarch64-linux-gnu Get the bl31.bin file - Arm Trust Firmware.   Download source from: git clone -b lf-5.10.72-2.2.0 https://source.codeaurora.org/external/imx/imx-atf Build: cd imx-atf make clean PLAT=imx8qm CROSS_COMPILE=aarch64-linux-gnu- make PLAT=imx8qm CROSS_COMPILE=aarch64-linux-gnu- bl31 The compiled bl31.bin location: build/imx8qm/release/bl31.bin Get the u-boot.bin file - u-boot.   Download source from: git clone -b lf-5.10.72-2.2.0 https://source.codeaurora.org/external/imx/uboot-imx Build: cd uboot-imx make ARCH=arm CROSS_COMPILE=aarch64-linux-gnu- imx8qm_mek_defconfig make ARCH=arm CROSS_COMPILE=aarch64-linux-gnu- The compiled u-boot.bin location: ./u-boot.bin Get the mx8qmb0-ahab-container.img file - iMX Seco. wget https://www.nxp.com/lgfiles/NMG/MAD/YOCTO/imx-seco-3.7.4.bin chmod +x imx-seco-3.7.4.bin ./imx-seco-3.7.4.bin --auto-accept The mx8qmb0-ahab-container.img file location: imx-seco-3.7.4/firmware/seco/mx8qmb0-ahab-container.img Get the scfw_tcm.bin file - SCFW.   Download and Install a GNU Toolchain.   Look at the packages/imx-scfw-porting-kit-1.7.4/doc/pdf/ , chapter Porting Guide, sub-chapter Tool Chain to check which GNU Toolchain version corresponds to the SCFW you are building. The imx-scfw-porting-kit-1.7.4 version uses the GNU Toolchain version gcc-arm-none-eabi-8-2018-q4-major . It is recommended to install toolchain in “opt” folder: cd /opt sudo wget https://developer.arm.com/-/media/Files/downloads/gnu-rm/8-2018q4/gcc-arm-none-eabi-8-2018-q4-major-linux.tar.bz2 sudo tar xjf gcc-arm-none-eabi-8-2018-q4-major-linux.tar.bz2 Download and Install a Arm GCC toolchain. It is recommended to install toolchain in “opt” folder: sudo wget https://releases.linaro.org/components/toolchain/binaries/7.3-2018.05/aarch64-linux-gnu/gcc-linaro-7.3.1-2018.05-x86_64_aarch64-linux-gnu.tar.xz sudo tar -Jxvf gcc-linaro-7.3.1-2018.05-x86_64_aarch64-linux-gnu.tar.xz After installing the toolchain, set up the environment variable relevant for building. export ARCH=arm CROSS_COMPILE=/opt/gcc-linaro-7.3.1-2018.05-x86_64_aarch64-linux-gnu/bin/aarch64-linux-gnu- export TOOLS=/opt Build the scfw_tcm.bin file. cd ~ wget https://www.nxp.com/lgfiles/NMG/MAD/YOCTO/imx-scfw-porting-kit-1.7.4.bin chmod +x imx-scfw-porting-kit-1.7.4.bin ./imx-scfw-porting-kit-1.7.4.bin --auto-accept cd imx-scfw-porting-kit-1.7.4/src Extract the desired scfw porting kit: tar -xvf scfw_export_mx8qm_b0.tar.gz cd scfw_export_mx8qm_b0/ Build without debug monitor: make clean make qm B=mek R=B0 Build with debug monitor: make clean make qm B=mek D=1 M=1 R=B0 DDR_CON=imx8qm_dcd_1.6GHz The scfw_tcm.bin file location: build_mx8qm_b0/scfw_tcm.bin   Generate the bootable image.   Once you have the four files needed to generate a bootable image, use imx-mkimage tool. Download source from: git clone -b lf-5.10.72-2.2.0 https://source.codeaurora.org/external/imx/imx-mkimage Copy the four binaries to iMX8QM folder. You have to rename some files. If you got the four binaries with Yocto. cp ~/imx-yocto-bsp/imx8qmmek/tmp/deploy/images/imx8qmmek/imx-boot-tools/bl31-imx8qm.bin ~/imx-mkimage/iMX8QM/bl31.bin cp ~/imx-yocto-bsp/imx8qmmek/tmp/deploy/images/imx8qmmek/imx-boot-tools/u-boot-imx8qmmek.bin-sd ~/imx-mkimage/iMX8QM/u-boot.bin cp ~/imx-yocto-bsp/imx8qmmek/tmp/deploy/images/imx8qmmek/imx-boot-tools/mx8qmb0-ahab-container.img ~/imx-mkimage/iMX8QM cp ~/imx-yocto-bsp/imx8qmmek/tmp/deploy/images/imx8qmmek/imx-boot-tools/mx8qm-mek-scfw-tcm.bin ~/imx-mkimage/iMX8QM/scfw_tcm.bin If you got the four binaries with stand alone build. cp ~/imx-atf/build/imx8qm/release/bl31.bin ~/imx-mkimage/iMX8QM cp ~/uboot-imx/u-boot.bin ~/imx-mkimage/iMX8QM cp ~/imx-seco-3.7.4/firmware/seco/mx8qmb0-ahab-container.img ~/imx-mkimage/iMX8QM cp ~/imx-scfw-porting-kit-1.7.4/src/scfw_export_mx8qm_b0/build_mx8qm_b0/scfw_tcm.bin ~/imx-mkimage/iMX8QM Build the bootable image. cd ~/imx-mkimage make SOC=iMX8QM flash The compiled file is flash.bin and its location is: iMX8QM/flash.bin   Flash the bootable image.   To flash the bootable image follow the next steps: -Copy the flash.bin and uuu.exe in a folder. -Change SW2 on the base board to 000100 (from MSB to LSB, 1-ON and 0-OFF) to boot from the Serial Downloader. -Run the following command in Command Prompt: uuu.exe -b sd flash.bin -Power on the MEK CPU board.   SCFW debug monitor.        If the SCFW is compiled using the M=1 option (default is M=0) then it will include a debug monitor. This can be used to R/W memory or registers, R/W power state, and dump some resource manager state. Production SCFW should never have the monitor enabled (M=0, the default)!      The debug monitor allows command-line interaction via the SCU UART. Inclusion of the debug monitor affects SCFW timing and therefore should never be deployed in a product! Note the terminal needs to be in a mode that sends CR or LF for a new line (not CR+LF). The following commands are supported: Command                                   Description exit                                              exit the debug monitor quit                                              exit the debug monitor reset [mode]                                request reset with mode (default = board) reboot partition [type]                  request partition reboot with type (default = cold) md.b address [count]                  display count bytes at address md.w address [count]                 display count words at address md[.l] address [count]                 display count long-words at address mm.b address value                   modify byte at address mm.w address value                  modify word at address mm[.l] address value                  modify long-word at address ai.r ss sel addr                            read analog interface (AI) register ai.w ss sel addr data                  write analog interface (AI) register fuse.r word                                 read OTP fuse word fuse.w word value                      write value to OTP fuse word dump rm                                    dump all the resource manager (RM) info dump rm part [part]                    dump all partition info for part (default = all) dump rm rsrc [part]                    dump all resource info for part (default = all) dump rm mem [part]                  dump all memory info for part (default = all) dump rm pad [part]                    dump all pad info for part (default = all) power.r [resource]                     read/get power mode of resource (default = all) power.w resource mode            write/set power mode of resource to mode (off, stby, lp, on) info                                             display SCFW/SoC info like unique ID, etc. seco lifecycle change                send SECO lifecycle update command (change) to SECO seco info                                    display SECO info like Lifecycle, SNVS state, etc. seco debug                                dump SECO debug log seco events                               dump SECO event log seco commit                              commit SRK and/or SECO FW version update pmic.r id reg                               read pmic register pmic.w id reg val                        write pmic register pmic.l id                                      list pmic info (rail voltages, etc) Resource and subsystem (ss) arguments are specified by name. All numeric arguments are decimal unless prefixed with 0x (for hex) or 0 (for octal). Testing SCFW debug monitor to display count long-words at address on Linux side and on SCU side. -Change SW2 on the base board to 001100 (from MSB to LSB, 1-ON and 0-OFF) to boot from the SD card. -Power on the MEK CPU board. -Open Tera Term and you will see: Hello from SCU (Build 5263, Commit 9b3d006e, Aug 20 2021 12:20:10) ​ DDR frequency = 1596000000  ROM boot time = 262368 usec      Boot time = 24583 usec         Banner = 10 usec           Init = 9038 usec         Config = 3232 usec            DDR = 2677 usec        SConfig = 444 usec           Prep = 5039 usec ​ *** Debug Monitor *** ​ >$ -Run the following commands: power.r power.w db on power.w dblogic on power.w mu_1a on -Example reading on Linux side: md.l 0x5d1c0000 10 -You will see: >$ md.l 0x5d1c0000 10 5d1c0000: 00000000 00000000 00000000 00000000 5d1c0010: 00010201 23c34600 d63fdb21 00000000 5d1c0020: 00f00200 18000000 -Example reading on SCU side: md.l 0x41cac080 10 -You will see: >$ md.l 0x41cac080 10 41cac080: 00000000 00000000 00000000 00000000 41cac090: 0d070201 ff0001f1 ffff8000 ffff00fb 41cac0a0: 00f00000 18000000 For more information see the System Controller Firmware Porting Guide.

i.MX8/i.MX8X/i.MX8DXL has ddr stress test tool. It is a window UI program. In some cases, i.MX devices is security closed. Need signed image to run. Such as unit fail field return analyze, switch new ddr part on existing board.  

Useful information about push buttons.   Physical level.            When there is a change of voltage level on P0-P7 pins, PCA9555PW will generate interrupt on INT pin. The driver (running on SoC) can read the status of P0-P7 pins via I2C (SCL/SDA pins) and generate separate interrupts for each of P0-P7 pins. This is why this driver acts as interrupt controller. Consider next configuration:        One push button changes level on P4 pin, tempting PCA9555PW to generate interrupt. Interrupt from PCA9555PW is connected to GPIO5 IP-core (inside of SoC), and it uses line #9 of that GPIO5 module to notify CPU about interrupt. So we can say that PCA9555PW is cascaded to GPIO5 controller. GPIO5 also acts as interrupt controller, and it's cascaded to GIC interrupt controller.   Device tree properties.   The meaning of properties is as follows: interrupt-controller  property defines that device generates interrupts; it will be needed further to use this node as interrupt-parent in each push button node. #interrupt-cells defines format of interrupts property; in our case it's 2 : 1 cell for line number and 1 cell for interrupt type interrupt-parent and interrupts properties are describing interrupt line connection   Interrupt handling.   CPU now is in interrupt context in GIC interrupt handler. From gic_handle_irq() it calls handle_domain_irq() , which in turn calls generic_handle_irq() . See Documentation/gpio/driver.txt for details. Now we are in SoC's GPIO controller IRQ handler. SoC's GPIO driver also calls generic_handle_irq() to run handler, which is set for each particular pin. See for example how it's done in omap_gpio_irq_handler() . Now we are in PCA9555PW IRQ handler. PCA9555PW IRQ handler calls handle_nested_irq() . Finally, gpio_keys_gpio_isr() is called.      The following steps allow you to enable rgb led's and push buttons on 8MIC-RPI-MX8 board with i.MX 8M Mini Applications Processor Evaluation Kit (EVKB). You have to use a led driver and change the device tree. On the Host. Cloning the Linux kernel repository.   Clone the i.MX Linux Kernel repo to the home directory. cd ~ git clone https://source.codeaurora.org/external/imx/linux-imx This guide will use the following commit which corresponds to Kernel 5.10.35-2.0. cd linux-imx/ git checkout -b RGB ef3f2cfc6010 Patching the device tree.   Download the "0001-Enable-RGB-LED-s-and-push-buttons-on-8MIC-RPI-MX8-bo.patch" file attached to this post and copy it into linux-imx directory, then apply the patch. cp 0001-Enable-RGB-LED-s-and-push-buttons-on-8MIC-RPI-MX8-bo.patch ~/linux-imx/ cd ~/linux-imx/ patch < 0001-Enable-RGB-LED-s-and-push-buttons-on-8MIC-RPI-MX8-bo.patch When prompted, select the file to patch: File to patch: arch/arm64/boot/dts/freescale/imx8mm-evk-8mic-revE.dts patching file arch/arm64/boot/dts/freescale/imx8mm-evk-8mic-revE.dts Then setup your toolchain, for example: source /opt/fsl-imx-wayland/5.10-hardknott/environment-setup-cortexa53-crypto-poky-linux Generate config file. make imx_v8_defconfig Compile the device tree. make freescale/imx8mm-evk-8mic-revE.dtb Copy the .dtb file to the EVK, for example with scp: scp imx8mm-evk-8mic-revE.dtb root@<EVK_IP>:/home/root Alternatively, you may copy the .dtb file directly to the FAT32 partition where the Kernel and Device Tree files are located. Compiling the Led driver.   Obtain the leds-pca995x.h file in the next site: https://github.com/TechNexion/linux-tn-imx/blob/tn-imx_5.4.70_2.3.0-stable/include/linux/platform_data/leds-pca995x.h  Copy it into the next path: cp leds-pca995x.h ~/linux-imx/include/linux Create a new directory. mkdir ~/linux-imx/PCA9955 Create a makefile. cd ~/linux-imx/PCA9955 vim Makefile   KERNEL_ROOT?=~/linux-imx obj-m += leds-pca995x.o all: make -C $(KERNEL_ROOT) M=$(PWD) modules clean: make -C $(KERNEL_ROOT) M=$(PWD) clean   Press the key "Esc" and then: :wq Obtain the leds-pca995x.c file in the next site: https://github.com/TechNexion/linux-tn-imx/blob/tn-imx_5.4.70_2.3.0-stable/drivers/leds/leds-pca995x.c Copy it into the next path: cp leds-pca995x.c ~/linux-imx/PCA9955 Obtain 0001-PCA9955BTW.patch file and copy it into the next path: cp 0001-PCA9955BTW.patch ~/linux-imx/PCA9955 Apply the patch. patch < 0001-PCA9955BTW.patch Then setup your toolchain, for example: source /opt/fsl-imx-wayland/5.10-hardknott/environment-setup-cortexa53-crypto-poky-linux Generate .ko file. cd ~/linux-imx/PCA9955 make all Copy the .ko file to the EVK, for example with scp: scp leds-pca995x.ko [email protected]:/home/root NOTE: The linux version of .ko file must be the same as EVK. On the EVK. Switching the device tree.   To copy the updated device tree to the corresponding partition, first create a directory. mkdir Partition_1 Mount the partition one. mount /dev/mmcblk1p1 Partition_1/ Copy or move the device tree into partition one. cp imx8mm-evk-8mic-revE.dtb Partition_1/ Reboot the board. reboot Stop on u-boot and modify the .dtb file to use the device tree for 8mic board. u-boot=> editenv fdtfile edit: imx8mm-evk-8mic-revE.dtb u-boot=> saveenv Saving Environment to MMC... Writing to MMC(1)... OK u-boot=> boot Installing a led driver.   Execute the following command to load the led driver into the kernel. insmod leds-pca995x.ko And you will see something like: [ 249.359103] leds_pca995x: loading out-of-tree module taints kernel. [ 249.366864] ALL [ 249.368740] ALL 0 [ 249.370667] ALL 1 [ 249.372609] ALL 2 [ 249.374536] ALL 2 [ 249.376475] ALL 2 [ 249.378401] ALL 2 [ 249.380338] ALL 2 [ 249.382264] ALL 2 [ 249.384202] ALL 2 [ 249.386127] ALL 2 [ 249.388063] ALL 2 [ 249.389989] ALL 2 [ 249.391913] ALL 2 [ 249.393847] ALL 2 [ 249.395774] ALL 2 [ 249.397709] ALL 2 [ 249.399635] ALL 2 [ 249.401568] ALL 2 [ 249.403496] ALL 3 Turning on a Led.   If you changed the device tree, you can turn on a led with the following command: echo 250 > /sys/class/leds/pca995x\:blue0/brightness To turn off a led: echo 0 > /sys/class/leds/pca995x\:blue0/brightness The red, blue and green leds can be turned on at different intensities provided. Testing the push buttons.   If you changed the device tree, you can test the push buttons with the following command: evtest Select the correct number: No device specified, trying to scan all of /dev/input/event* Available devices: /dev/input/event0: 30370000.snvs:snvs-powerkey /dev/input/event1: sw_keys /dev/input/event2: gpio_ir_recv Select the device event number [0-2]: 1 And you will see: Input driver version is 1.0.1 Input device ID: bus 0x19 vendor 0x1 product 0x1 version 0x100 Input device name: "sw_keys" Supported events: Event type 0 (EV_SYN) Event type 1 (EV_KEY) Event code 67 (KEY_F9) Event code 113 (KEY_MUTE) Event code 114 (KEY_VOLUMEDOWN) Event code 115 (KEY_VOLUMEUP) Properties: Testing ... (interrupt to exit) Event: time 1642457988.1642457988, type 1 (EV_KEY), code 114 (KEY_VOLUMEDOWN), value 1 Event: time 1642457988.1642457988, -------------- SYN_REPORT ------------ Event: time 1642457988.1642457988, type 1 (EV_KEY), code 114 (KEY_VOLUMEDOWN), value 0 Event: time 1642457988.1642457988, -------------- SYN_REPORT ------------

We will build a remote debug environmet of Qt Creator in this user guide.   Contents 1 Change local.conf file in Yocto 2 2 Build and deploy Yocto SDK 2 2.1 Build full image SDK . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 2.2 Deploy SDK . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 3 Configure QT Kit 2 3.1 Setup device . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 3.2 Configure QT version . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 3.3 Configure gcc and g++ manually . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 3.4 Configure gdb manually . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 3.5 Configure Kit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 3.6 Very important thing!! . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 4 Test result

In some cases, such as OTA, need a complete reset/reboot of the i.MX8/i.MX8X. Current BSP default design for  i.MX8/i.MX8X is partition reset/reboot. So even using spl bootloader(flash.bin). The scfw is still running old version. Not the upgrade version as expected. Because the reset/reboot by the u-boot or Linux, Only reset/reboot the A Core partition. SCU is not reset. Need to change to the board reset, which will launch entire reset/reboot of the i.MX8/i.MX8X including SCU.

This article introduces how to connect a device via Bluetooth to the i.MX8M family of boards.

    Test environment: MPU6050 module,i.MX8MP,Android11_2.4.0 This solution ported the MPU6050 module on Android to realize auto rotation of screen.