According with the Rack Matrix BLOG article describing how to update the PC Engines APUx BIOS.
We update the SD image with last BIOS 4.9.0.6 released at 2019-06-08 and can be download
hereV4.9.0.6
release date 2019-06-08
List of change- Fixed/added:
- rebased with official coreboot repository commit 3b4d0e0
- vboot support with measured boot for apu2
- serial ports are now described in ACPI
- watchdog is now runtime configurable
- SD 3.0 mode is now runtime configurable
- updated SeaBIOS to rel-1.12.1.2
- updated sortbootorder to v4.6.14
- all USB devices have now a single boot order priority
- Known issues:
- some PCIe cards are not detected on certain OSes and/or in certain mPCIe slots
- booting with 2 USB 3.x sticks plugged in apu4 sometimes results in detecting only 1 stick
- certain USB 3.x sticks happen to not appear in boot menu
- booting Xen is unstable
