1. Installing Images Using USB Serial Downloader Protocol (SDP)

The preferred method of installing Yocto images to SD card is this: Flashing SD Card with Linux Image from Linux Host. However sometimes, extracting the SD card from the kit is not possible (for example, when the kit is installed to a device and is not easily accessible). In this case, use the method below.

Perform the following step-wise procedure to install the Yocto images to SD card installed into i.MX 8M NAVQ Plus kit:

1. Power the kit off by disconnecting the USB Type C cable from the development host.

2. Set the target boot mode to the USB serial downloader mode by setting the boot switches as follows:

   • SW2.1 - 1

   • SW2.2 - 0

3. Power the kit on by connecting the USB Type C cable to the development host. Use the kit port labeled USB1.

   

4. Check that the new USB device has appeared on your development host:

   [psl@i7 ~]$ lsusb | grep -i nxp 
   Bus 001 Device 025: ID 1fc9:0146 NXP Semiconductors

5. On the host, go to the Yocto images directory:

   [psl@i7 ~]$ cd ~/5-15-5-DESKTOP/builddir/tmp/deploy/images/imx8mpnavq 
   [psl@i7 imx8mmnavq]$ ls -1
   ...
   imx-boot-imx8mpnavq-sd.bin-flash_evk
   imx-image-desktop-ros-imx8mpnavq.wic.zst
   uuu
   ...

   • The images above are:

   • imx-boot-imx8mpnavq-sd.bin-flash_evk - U-Boot-ATF-OPTEE boot image;

   • imx-image-desktop-ros-imx8mpnavq.wic.zst - Ubuntu root filesystem;

   • uuu - pre-built image of the uuu utility (you could also use pre-built uuu image from https://github.com/NXPmicro/mfgtools/releases/latest, or build it from sources https://github.com/NXPmicro/mfgtools/tree/master);

6. Unpack the compressed image of the root filesystem:

   [psl@i7 imx8mmnavq]$ zstd -d imx-image-desktop-ros-imx8mpnavq.wic.zst
   ...

7. Launch the uuu tool with appropriate script as a parameter for installing the bootable Linux image:

   [psl@i7 imx8mmnavq]$ sudo ./uuu -v -b sd_all imx-boot-imx8mpnavq-sd.bin-flash_evk imx-image-desktop-ros-imx8mpnavq.wic
   uuu (Universal Update Utility) for nxp imx chips -- libuuu_1.3.82-0-g9c56e46
   
   Wait for Known USB Device Appear...

8. The uuu tool will proceed to install the Production Yocto image to the storage device (SD card) on the target board:

   uuu (Universal Update Utility) for nxp imx chips -- libuuu_1.3.74-2-g302da91 
   
   Success 1 Failure 0
   ...
   1:3 7/ 7 [Done ] FB: Done

9. When uuu has finished, the bootable Linux image has been installed to the on-module storage. Given proper setting of the boot switches, next power-on will boot the target board from the SD storage device.

2. Verifying New Installation

Perform the following step-wise procedure to verify boot of the newly installed Linux images from the SD card plugged into the kit:

1. Power the kit off by disconnecting the USB Type C cable from the development host.

2. Select the appropriate boot mode (boot from SD) by setting the boot switches as follows:

   • SW2.1 - 1

   • SW2.2 - 1

3. Power the kit on by connecting the USB Type C cable to the development host.

4. Verify that the following Linux boot-up messages appear on the serial console:

   NOTICE:  BL31: v2.4(release): 
   NOTICE:  BL31: Built : 05:49:10, Mar  2 2022
   
   
   U-Boot 2021.04-lf_v2021.04+g60519b47e7 (Jul 31 2022 - 08:56:04 +0000)
   
   CPU:   i.MX8MP[8] rev1.1 1800 MHz (running at 1200 MHz)
   CPU:   Commercial temperature grade (0C to 95C) at 44C
   Reset cause: POR
   Model: Voxelbotics NAVQPlus board
   DRAM:  4 GiB
   ...
   Starting kernel ...
   
   [    0.000000] Booting Linux on physical CPU 0x0000000000 [0x410fd034]
   ...
   Ubuntu 20.04.3 LTS imx8mpnavq ttymxc1
   
   imx8mpnavq login:
   

5. Enter the Linux session by typing user for both the user name and password.