VAR-SOM-MX7 Yocto Recovery SD card

VAR-SOM-MX7 - Yocto recovery SD card

Variscite provides a recovery SD card image that can be used to install the pre-built U-Boot, Linux kernel and the file system into the internal storage of the SOM.

Download the recovery SD card image

Download mx7-som-recovery-sd.vXX.img.gz (latest) from Variscite's FTP server: ftp://customerv:Variscite1@ftp.variscite.com/VAR-SOM-MX7/Software/

Write the image to an SD card

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-recovery-sd.vXX.img.gz
$ sudo umount /dev/sdX*
$ sudo dd if=mx7-som-recovery-sd.vXX.img of=/dev/sdX bs=1M

(Replace /dev/sdX with your actual device)

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.

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 SELECT DIP switches are set to SD card: Setting the BOOT SELECT DIP switches
• Power up the board - it will boot into Linux from the SD card

Flash from GUI

Touch/Click on the appropriate icon:

• Install Yocto NAND flash: Flash Yocto to NAND flash
• Install Yocto eMMC: Flash Yocto to eMMC

Flash from command line

• Login as root (no password)
• From Linux command line, type one of flash options

$ install_yocto.sh	- Flash Yocto into eMMC or NAND Flash (Follow instructions)

SD card image file tree

/opt/images/
└── Yocto
    ├── imx7d-var-som-emmc.dtb
    ├── imx7d-var-som-nand.dtb
    ├── rootfs.tar.bz2
    ├── rootfs.ubi
    ├── u-boot.imx-nand
    ├── u-boot.imx-sd
    └── zImage

The install_yocto.sh script file is located at /usr/bin/