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.vXX.img.gz ( latest which is available on Variscite's FTP)

$ gunzip mx6-som-nand-recovery-sd.XX.img.gz
$ sudo dd if=mx6-som-nand-recovery-sd.vXX.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 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)
Flash options

$ android-emmc.sh - flash Android into eMMC
$ yocto-emmc.sh - flash Yocto into eMMC (See note below)
$ yocto-dart.sh - flash Yocto into eMMC DART only.
$ yocto-nand.sh - flash Yocto into nand

in case of yocto-emmc.sh, change boot arguments to :

setenv bootargs console=ttymxc0,115200 video=mxcfb1:off root=/dev/mmcblk1p1 rootwait rw
saveenv

SDCARD File Structure

/media/rootfs/opt/images/ └── Yocto

   ├── rootfs.tar.bz2
   ├── rootfs.ubi.img
   ├── SPL
   ├── SPL.mmc
   ├── u-boot.img
   ├── u-boot.img.mmc
   ├── uImage
   ├── uImage-imx6dl-var-som.dtb
   ├── uImage-imx6dl-var-som-solo.dtb
   ├── uImage-imx6dl-var-som-solo-vsc.dtb
   ├── uImage-imx6q-var-dart.dtb
   ├── uImage-imx6q-var-som.dtb
   └── uImage-imx6q-var-som-vsc.dtb