View source for VAR-SOM-MX7 Debian Recovery SD card

{{PageHeader|VAR-SOM-MX7 - Debian recovery SD card}} {{DocImage|category1=VAR-SOM-MX7|category2=Debian}}
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.

== 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/

== 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)
<pre>
$ 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)
</pre>

=== Using a Windows based host ===
Download Win32 Disk Imager from: https://sourceforge.net/projects/win32diskimager/, install and run it.<br>
Select the image file, and the SD card device - double check that the device is correct to avoid accidentally overwriting a different device.<br>
Click on "Write".<br>
No need to format the SD card before writing the image to it.<br>

== 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: [[VAR-SOM-MX7_Debian_Jessie_R2#Setting_board_dip-switches|Setting the Boot DIP switches]]
* Power up the board - it will boot into Linux from the SD card

=== Flash from command line ===
* Login as root (no password)
* From Linux command line, type the following
{{#ifeq: {{#var:DEBIAN_INSTALL_SCRIPT}}|unified|
<pre>
# install_debian.sh -r nand (Follow instructions)
# install_debian.sh -r nand -m	- Flash Debian images with Cortex-M4 support into NAND flash (for SOMs with NAND flash)
</pre>
|
<pre>
# debian-nand.sh	- Flash Debian 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)
</pre>
}}
In case you are using a SOM with eMMC, run the following command '''as root''' to install Debian on it:
{{#ifeq: {{#var:DEBIAN_INSTALL_SCRIPT}}|unified|
<pre>
# install_debian.sh -r emmc (Follow instructions)
</pre>
|
<pre>
# debian-emmc.sh - Flash Debian into eMMC (for SOMs with eMMC)
</pre>
(both regular device tree and device tree with Cortex-M4 support will be installed)
}}

=== SD card image file tree ===
<pre>
/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
</pre>

<pre>
The debian-emmc.sh and debian-nand.sh script files are located at /usr/sbin/
</pre>