VAR-SOM-AM33 Yocto NAND Recovery

NAND Recovery introduction

As an easy and fast way to recover the VAR-SOM-AM33 NAND flash, Variscite provides a recovery SD card image that can be used to install the pre-built Linux and Android systems.
This SD card image includes a script (nand-recovery.sh) that installs all the boot images and root file-system.

Download Variscite's pre-built recovery SD card image

Download am33-som-nand_recovery-sd-Yocto-krogoth-resistive-v6.img.gz from Variscite's FTP server:

$ wget https://variscite-public.nyc3.cdn.digitaloceanspaces.com/VAR-SOM-AM33/Software/am33-som-nand_recovery-sd-Yocto-krogoth-resistive-v6.img.gz

Download am33-som-nand_recovery-sd-Yocto-krogoth-v6.img.gz from Variscite's FTP server:

$ wget https://variscite-public.nyc3.cdn.digitaloceanspaces.com/VAR-SOM-AM33/Software/am33-som-nand_recovery-sd-Yocto-krogoth-v6.img.gz

Using a Linux based host

Plug-in the SD card to your Linux host PC, run dmesg and see which device is added (i.e. /dev/sdX or /dev/mmcblkX)

$ sudo umount /dev/sdX?*

# For .img.gz files:
$ zcat <image name>.img.gz | sudo dd of=/dev/sdX bs=1M && sync

(Replace /dev/sdX with your actual device)

Connect target debug serial to linux host

Follow : http://www.variscite.com/images/stories/DataSheets/VAR_DVK_AM33_V1.11_Quick_Start_Guide_V1.0.pdf
to connect target serial debug port to host PC

Boot NAND recovery SD card

• 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 the SD card
• login as 'root', no password is required

NAND recovery script usage

NAND recovery script usage:

usage: /sbin/nand-recovery.sh options

This script install Linux/Android binaries in VAR-SOM-AM33 NAND.

OPTIONS:
  -h Show this message
  -o <Linux|Android> OS type (default: Linux).