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For XM boards with SoC GK7202V300, GK7205V200, GK7205V300 ONLY!!!

Supported sensors

Please look up your sensor in the list of supported devices.

Initial device firmware updates

setenv bootargs 'mem=${osmem:-32M} console=ttyAMA0,115200 panic=20 root=/dev/mtdblock3 rootfstype=squashfs init=/init mtdparts=sfc:256k(boot),64k(env),2048k(kernel),5120k(rootfs),-(rootfs_data)'
setenv bootcmd 'setenv setargs setenv bootargs ${bootargs}; run setargs; sf probe 0; sf read 0x42000000 0x50000 0x200000; bootm 0x42000000'
setenv uk 'mw.b 0x42000000 ff 1000000; tftp 0x42000000 uImage.${soc} && sf probe 0; sf erase 0x50000 0x200000; sf write 0x42000000 0x50000 ${filesize}'
setenv ur 'mw.b 0x42000000 ff 1000000; tftp 0x42000000 rootfs.squashfs.${soc} && sf probe 0; sf erase 0x250000 0x500000; sf write 0x42000000 0x250000 ${filesize}'
saveenv

setenv soc gk7xxxxxxx            # Set your SoC. gk7202v300, gk7205v200, or gk7205v300.
setenv osmem 32M
setenv totalmem 64M              # 64M for gk7202v300, gk7205v200, 128M for gk7205v300.
setenv ipaddr 192.168.1.10
setenv serverip 192.168.1.254    # Your TFTP server IP address.
saveenv

run uk; run ur; reset            # Flash kernel, rootfs and reboot device

Follow-up quick updates

run uk; run ur; reset

A trick for GK7205V300+IMX335 users

echo -e "!/bin/sh\n\ndevmem 0x120100f0 32 0x19\n" >/etc/init.d/S96trick
chmod +x /etc/init.d/S96trick

Alternative way here

Danger zone

You always have an option to update the bootloader. However, you need to understand what you do.

NB! Replace bootloader filename with the one matching your SoC. Full list is here.

mw.b 0x42000000 ff 1000000
tftp 0x42000000 u-boot-gk7xxxxxxxx-beta.bin
sf probe 0
sf erase 0x0 0x50000
sf write 0x42000000 0x0 ${filesize}
reset