DART-6UL Yocto NAND Recovery

DART-6UL - 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 HOST PC, run dmesg and see which device is added (i.e. /dev/sdX or /dev/mmcblk0)
Download mx6ul-dart-nand-recovery-sd.vXX.img.gz ( latest which is available on Variscite's FTP)

$ gunzip mx6ul-dart-nand-recovery-sd.XX.img.gz
$ sudo dd if=mx6ul-dart-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)
Switch the relevant dip-switch to "Boot from SD-Card", according to the relevant start-up guide of your system.
See picture below.

File:Boot switch 6ul.jpg

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 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 one of flash options

$ $ yocto-emmc.sh - flash Yocto into eMMC (See note below)
$ 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 image file tree

/media/rootfs/opt/images/
└── Yocto
    ├── rootfs.sdcard
    ├── rootfs.tar.bz2
    ├── rootfs.ubi.img
    ├── SPL-nand
    ├── SPL-sd
    ├── u-boot-nand-2015.04-r0.img
    ├── u-boot-sd-2015.04-r0.img
    ├── zImage
    ├── zImage-imx6ul-var-dart-emmc_wifi.dtb
    ├── zImage-imx6ul-var-dart-nand_wifi.dtb
    ├── zImage-imx6ul-var-dart-sd_emmc.dtb
    └── zImage-imx6ul-var-dart-sd_nand.dtb

Script files located on /media/rootfs/sbin/
yocto-nand.sh
nand-recovery.sh
yocto-emmc.sh