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.

Booting options for DART-6UL

Booting your system from require switching the relevant dip-switch to "Boot from SD-Card", according to the relevant start-up guide of your system.See picture below.

"00" The current position will set the system to boot from SDCARD. The picture mode
"01" Moving the right switch will set the system to boot eMMC
"10" Moving the left switch will set the system to boot NAND
"11" is illegal.

Be aware that your system has eMMC or NAND but never both.

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",See section above.
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