VAR-SOM-MX6 Yocto NAND Recovery

From Variscite Wiki

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

Desktop1 1.png

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

Desktop2 1.png

  • Push FlashAndroid or FlashYocto icon.
  • This method only supports flashing into NAND.

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