VAR-SOM-MX6 Yocto NAND Recovery

Variscite provides a recovery SD-card image that can be used to install the pre-built U-Boot, Linux kernel and the UBI file system into the Nand-Flash This SD card image includes a script (nand-recovery.sh) that installs all the boot images and root file-system.

Preparing rescue SD-Card:

• Plug-in the supplied SD card to your Linux machine, run dmesg and see which device is added (i.e. /dev/sdX or /dev/mmcblk0)
• Download mx6-som-nand-recovery-sd.v38.img.gz (or latest which is available on Variscite's FTP)
• Version 38 and above support all VAR-SOM-MX6 SOM's version and VAR-SOM-SOLO.

$ gunzip mx6-som-nand-recovery-sd.v38.img.gz
$ sudo dd if=mx6-som-nand-recovery-sd.v38.img of=/dev/sdX bs=128k
Replace /dev/sdX with your true device, You can find it with dmesg.

Recover Nand Flash:

• Insert the SD card into the SD/MMC slot of the custom board
• Press and hold the boot-select button, power-off and power-on the board
• The board will automatically boot into Linux from SD-Card

Flash from GUI

• Press the right arrow on the upper right corner to change the desktop into Utilities.

• Push Android-eMMC to flash Android into eMMC.
• Push Yocto-nand flash Yocto into nand.
• Push Yocto-eMMC flash Yocto into eMMC. This option require changes in u-boot environment.

Flash from command line

• Login as root (no password)
• From Linux command line, type: "nand-recovery.sh" (This will install Yocto/Linux on the NAND)
• Help

nand-recovery.sh -h

               usage: /sbin/nand-recovery.sh options

               This script install Android(KitKat)/Yocto V6(Daisy)/Yocto V5(Dora) binaries in VAR-SOM-MX6 NAND.

               OPTIONS:
               -h                       Show this message
               -o <Android|Yocto|Dora>  OS type (defualt: Yocto).
               -m <Nand|Emmc>           Media type (defualt: Nand).

• NAND:
  • To install Android type: "nand-recovery.sh -o Android".
  • To install Yocto Daisy type: "nand-recovery.sh -o Yocto".
• eMMC:
  • To install Android type: "nand-recovery.sh -o Android -m Emmc".
  • To install Yocto Daisy type: "nand-recovery.sh -o Yocto -m Emmc".
• NAND Dora
• NAND:
  • To install Android type: "nand-recovery.sh -o Dora".
• Reboot and Unplug the SD card