NAND Recovery introduction¶
As an easy and fast way to recover the VAR-SOM-AM43 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.
Preparing rescue SD-Card
- Plug your SD card to your Linux machine, run dmesg and see what device is added (i.e. /dev/sd**X**)
- gunzip am43-som-nand-recovery-sd.vX.img.gz (get latest)
- dd if=am43-som-nand-recovery-sd.vX.img of=/dev/sd**X** bs=128k
Creating Variscite's prebuilt 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/sdb)
- Download am43-som-nand-recovery-sd.vX.img.gz from ftp://Customerv:[email protected]/VAR-SOM-AM43/Software/
$ sudo umount /dev/sdX*
$ zcat am43-som-nand-recovery-sd.vX.img.gz | sudo dd of=/dev/sdX bs=1M
Replace /dev/sdX with your actual device.
Connect target debug serial to linux host¶
Follow : https://variscite.com/wp-content/uploads/2017/12/VAR_SOM_AM43-quick-start-guide.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)
- Push SW1 to SD-Card mode (On), and SW2 to non-eMMC (off)
- The board will automatically boot into Linux from SD-Card
- login as 'root', no password is required
NAND recovery script usage¶
NAND recovery script usage: