VAR-SOM-MX7 Debian Recovery SD card
From Variscite Wiki
VAR-SOM-MX7 - Debian recovery SD card
Variscite provides a recovery SD card image that can be used to install the pre-built Debian images into the internal storage device of the SOM.
1 Download the recovery SD card image
Download mx7-som-debian-recovery-sd.vXX.img.gz (latest) from Variscite's FTP server: ftp://customerv:Variscite1@ftp.variscite.com/VAR-SOM-MX7/Software/debian/
2 Write the image to an SD card
2.1 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)
$ gunzip mx7-som-debian-recovery-sd.vXX.img.gz $ sudo umount /dev/sdX* $ sudo dd if=mx7-som-debian-recovery-sd.vXX.img of=/dev/sdX bs=1M; sync (Replace /dev/sdX with your actual device)
2.2 Using a Windows based host
Download Win32 Disk Imager from: https://sourceforge.net/projects/win32diskimager/, install and run it.
Select the image file, and the SD card device - double check that the device is correct to avoid accidentally overwriting a different device.
Click on "Write".
No need to format the SD card before writing the image to it.
3 Recover NAND flash/eMMC
- Power-off the board.
- Insert the SD card into the SD card slot of the carrier board (DVK)
- Make sure the Boot DIP switches are set to SD card: Setting the Boot DIP switches
- Power up the board - it will boot into Linux from the SD card
3.1 Flash from command line
- Login as root (no password)
- From Linux command line, type the following
$ debian-nand.sh - Flash Debian images into NAND flash (for SOMs with NAND flash) $ debian-nand.sh -m - Flash Debian images with Cortex-M4 support into NAND flash (for SOMs with NAND flash) $ debian-emmc.sh - Flash Debian into eMMC (for SOMs with eMMC) (both regular device tree and device tree with Cortex-M4 support will be installed)
3.2 SD card image file tree
/opt/images/ └── Debian ├── imx7d-var-som-emmc.dtb ├── imx7d-var-som-emmc-m4.dtb ├── imx7d-var-som-nand.dtb ├── imx7d-var-som-nand-m4.dtb ├── rootfs.tar.gz ├── rootfs.ubi.img ├── SPL.mmc ├── SPL.nand ├── u-boot.img.mmc ├── u-boot.img.nand └── zImage
The debian-emmc.sh and debian-nand.sh script files are located at /usr/sbin/