Revision as of 18:07, 11 December 2023

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-....img.gz from Variscite's FTP server: ftp://customerv:Variscite1@ftp.variscite.com/VAR-SOM-AM33/Software

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).

@@ Line 7: / Line 7: @@
 Download am33-som-nand_recovery-sd-....img.gz from Variscite's FTP server: ftp://customerv:Variscite1@ftp.variscite.com/VAR-SOM-AM33/Software<br>
-{{:Recovery_SD_card_general}}
+=== 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=
@@ Line 14: / Line 22: @@
 to connect target serial debug port to host PC
-= Boot NAND recovery SD-Card=
+= 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 SD-Card
+*The board will automatically boot into Linux from the SD card
 *login as 'root', no password is required

VAR-SOM-AM33 Yocto NAND Recovery: Difference between revisions