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firmware_flashing.md

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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 like TinyCoreLinux.

coreboot.rom flashing

APU1
flashrom -w coreboot.rom -p internal -c "MX25L1605A/MX25L1606E/MX25L1608E"
APU2/3/4/5
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 v4.9.0.4 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.

Linux
setpci -s 18.0 6c.L=10:10
FreeBSD
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 entries. Since 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 this:

flashrom -w coreboot.rom -p internal:boardmismatch=force

Developer tricks

To automate firmware update while developing copy ssh keys to target machine:

cat ~/.ssh/id_rsa.pub | ssh [email protected] '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