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 mx6-som-recovery-sd.vXX.img.gz $ sudo umount /dev/sdX* $ sudo dd if=mx6-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/