Flash Debian Images from Network¶

Flashing a Complete Debian System from the Network Using TFTP and NFS¶

NOTES:

Please make sure your host system is ready to use TFTP/NFS. Use our Wiki if required: Debian Setup TFTP/NFS
This is a concept Wiki. Please adapt it to your system and your requirements.

Build Minimal File System¶

To set up a build environment, follow steps 3-6 of the Build Debian from source code guide.

Build the image:

var_build_image imx93-var-som debian:desktop "uboot linux"

Create the root file system directory and copy the files:

mkdir ~/flash_rootfs
sudo tar xf [...]/flexbuild/build_lsdk2412/images/rootfs_lsdk2412_debian_desktop_arm64.tar.zst -C ~/flash_rootfs
sudo cp -a ~/flash_rootfs/boot/*.dtb* /tftpboot
sudo cp ~/flash_rootfs/boot/Image.gz /tftpboot

Edit /etc/exports. For example:

sudo gedit /etc/exports

And add the following line to it (replace <uname> with the actual username):

/home/<uname>/flash_rootfs *(rw,sync,no_root_squash,no_all_squash,no_subtree_check)

Restart the NFS server:

sudo /etc/init.d/nfs-kernel-server restart

Boot the board, stop the autoboot to get to the U-Boot command line, and set the following environment variables:

setenv serverip <your host ip address>
setenv nfsroot /home/<your username>/flash_rootfs

If you want to set the fdt file yourself, instead of using the default auto detection:
setenv fdt_file <relevant device tree>

setenv bootcmd 'run netboot'
saveenv
boot

On the target flash your system:

install_debian.sh

A complete system is flashed into the SOM internal storage (NAND flash/eMMC). Once the file system is built you can use it again and again to flash your VAR-SOM-MX93. You can update the images to use your images and/or customize install_debian.sh to your requirements.