APUx firmware flashing
To flash firmware image to APUx SPI install (or use system with already installed) flashrom.
For Debian-based distributions you can install
flashrom by simply:
sudo apt-get install flashrom
You can also use minimal distributions with already installed
flashrom -w coreboot.rom -p internal -c "MX25L1605A/MX25L1606E/MX25L1608E"
flashrom -w coreboot.rom -p internal
A full power cycle is required after flashing. If it is not possible (e.g.
remote firmware upgrade), when flashing coreboot v188.8.131.52 or newer a full reset
can be forced with the following commands after using
flashrom. For older
firmware versions please refer to cold_reset.md.
setpci -s 18.0 6c.L=10:10
pciconf -w pci0:24:0 0x6c 0x580ffe10
After that reboot as usual. Platform will turn off for 3-5 seconds. Note that there are parts of the platform which cannot be reset with this approach. A full power cycle is strongly suggested when possible.
Motherboard mismatch warning
When you update firmware and try to flash image to apu board,
motherboard mismatch warning can be yielded. It is known issue related to SMBIOS table
v4.6.7 in mainline and
v4.0.15 in legacy, part number entry
is in shorter (correct) form. Therefore, if you update to those version (or
newer) a warning will appear. To flash BIOS correctly, just add
-p internal:boardmismatch=force flag. Entire flashing command should look like
flashrom -w coreboot.rom -p internal:boardmismatch=force
To automate firmware update while developing copy ssh keys to target machine:
cat ~/.ssh/id_rsa.pub | ssh firstname.lastname@example.org 'cat >> .ssh/authorized_keys'
Then you can use below command to flash APU2 recently built changes:
APU2_IP=192.168.0.101 && ssh root@$APU2_IP remountrw && \ scp build/coreboot.rom root@$APU2_IP:/root && \ ssh root@$APU2_IP flashrom -w /root/coreboot.rom -p internal \ && ssh root@$APU2_IP reboot