DART-6UL Yocto NAND Recovery

From Variscite Wiki
DART-6UL - Yocto recovery SD card

Variscite provides a recovery SD card image that can be used to install the pre-built U-Boot, Linux kernel and the file system into the internal storage of the SOM.

1 Download the recovery SD card image

Download mx6ul-dart-recovery-sd.vXX.img.gz (latest) from Variscite's FTP server: ftp://customerv:Variscite1@ftp.variscite.com/DART-6UL/Software/yocto/legacy-images

2 Write the image to an SD card

2.1 Using a Linux based host

Plug-in the SD card to your Linux HOST PC, run dmesg and see which device is added (i.e. /dev/sdX or /dev/mmcblkX)

$ gunzip mx6ul-dart-recovery-sd.vXX.img.gz
$ sudo umount /dev/sdX*
$ sudo dd if=mx6ul-dart-recovery-sd.vXX.img of=/dev/sdX bs=1M

(Replace /dev/sdX with your actual device)

2.2 Using a Windows based host

Download Win32 Disk Imager from: https://sourceforge.net/projects/win32diskimager/, install and run it.
Select the image file, and the SD card device - double check that the device is correct to avoid accidentally overwriting a different device.
Click on "Write".
No need to format the SD card before writing the image to it.

3 Recover NAND flash/eMMC

  • Power-off the board.
  • Insert the SD card into the SD card slot of the carrier board (DVK)
  • Make sure the Boot DIP switches are set to SD card: Setting the Boot DIP switches
  • Power up the board - it will boot into Linux from the SD card

3.1 Flash from GUI

DART-6UL Recovery.png

Touch/Click on the appropriate icon:

  • Install Yocto NAND, WiFi: Flash Yocto with WiFi support to NAND flash
  • Install Yocto NAND, SD card: Flash Yocto with SD card support to NAND flash
  • Install Yocto eMMC (SD/WiFi) : Flash Yocto to eMMC (installs both SD card and WiFi dtbs to the BOOT partition and let U-Boot select between them at boot time)

3.2 Flash from command line

  • Login as root (no password)
  • From Linux command line, type one of flash options
$ install_yocto.sh	- Flash Yocto into eMMC or NAND Flash (Follow instructions)

3.3 SD card image file tree

/opt/images/
└── Yocto
    ├── imx6ul-var-dart-emmc_wifi.dtb
    ├── imx6ul-var-dart-nand_wifi.dtb
    ├── imx6ul-var-dart-sd_emmc.dtb
    ├── imx6ul-var-dart-sd_nand.dtb
    ├── rootfs.tar.bz2
    ├── rootfs.ubi
    ├── SPL-nand
    ├── SPL-sd
    ├── u-boot.img-nand
    ├── u-boot.img-sd
    └── zImage
The install_yocto.sh script file is located at /usr/bin/