VAR-SOM-MX6 Yocto NAND Recovery V50plus

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 HOST PC, 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

• Power-off the board.
• Insert the SD card into the SD/MMC slot of the carrier board (DVK)
• Press and hold the boot-select button, and power-on the board while button is pressed
• 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 to flash Yocto into NAND.
• Push Yocto-eMMC to flash Yocto into eMMC.

Flash from command line

• Login as root (no password)
• From Linux command line, type one of flash options

$ android-emmc.sh 	- Flash Android into eMMC
$ yocto-emmc.sh		- Flash Yocto into eMMC
$ yocto-nand.sh		- Flash Yocto into NAND

SD card image file tree

/media/rootfs/opt/images/
├── Android
│   └── Emmc
│       ├── SPL
│       ├── SPL.mmc
│       ├── boot-imx6q-var-dart.img
│       ├── boot-som-mx6dl-c.img
│       ├── boot-som-mx6dl-r.img
│       ├── boot-som-mx6q-c.img
│       ├── boot-som-mx6q-r.img
│       ├── boot-som-mx6q-vsc.img
│       ├── boot-som-solo-c.img
│       ├── boot-som-solo-r.img
│       ├── boot-som-solo-vsc.img
│       ├── boot.img
│       ├── recovery-imx6q-var-dart.img
│       ├── recovery-som-mx6dl-c.img
│       ├── recovery-som-mx6dl-r.img
│       ├── recovery-som-mx6q-c.img
│       ├── recovery-som-mx6q-r.img
│       ├── recovery-som-mx6q-vsc.img
│       ├── recovery-som-solo-c.img
│       ├── recovery-som-solo-r.img
│       ├── recovery-som-solo-vsc.img
│       ├── recovery.img
│       ├── system.img
│       ├── u-boot-var-imx6-nand.img
│       └── u-boot-var-imx6-sd.img
└── Yocto
    ├── SPL
    ├── SPL.mmc
    ├── rootfs.tar.bz2
    ├── rootfs.ubi.img
    ├── u-boot.img
    ├── u-boot.img.mmc
    ├── uImage
    ├── uImage-imx6dl-var-som-solo-vsc.dtb
    ├── uImage-imx6dl-var-som-solo.dtb
    ├── uImage-imx6dl-var-som.dtb
    ├── uImage-imx6q-var-dart.dtb
    ├── uImage-imx6q-var-som-vsc.dtb
    └── uImage-imx6q-var-som.dtb

Script files located on /media/rootfs/sbin/:

nand-recovery.sh
mkmmc_yocto.sh
yocto-dart.sh
yocto-emmc.sh
yocto-nand.sh
mkmmc_android.sh
android-emmc.sh