PC Engines APU Series – Important BIOS Update

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Installing some systems/distributions (such as OPNSense, IPFire, CentOS, Ubuntu) can cause boot problems. The reason for this is the different management of storage media by the system distributions. This can affect both the APU2 and APU3, as well as the APU4 series, but an update of the BIOS to a new version can help.

BIOS tests with corresponding media
This table shows currently tested systems on BIOS v4.9.0.x with corresponding media:

    * - works well with BIOS v4.6.8 or later in mainline and all legacy releases; for v4.6.7 and older mainline versions, issues with installation and system functionality (installation break, unwanted reboots) can be fixed by adding a hint hint.ahci.0.msi="0". For more information, see this document.
    (2) - all apu boards have problems with USB 3.x stick detection in BIOS, system is working properly, but after reboot/warmboot/coldboot USB stick may not appear in BIOS boot menu (depends on the stick, well working sticks are mentioned in this document).
    (1) - Voyage Linux is bootable on SD card and works well in read-only mode, remounting as read-write and writing changes to SD sometimes results in kernel panic which often leads to non-operable system.

Further details about each OS at github.com

Further details on the current BIOS version v4.9.0.3:
The manufacturer provides further extensive information on this page: https://pcengines.github.io/.

General information about installing operating systems:
At https://pcengines.ch/howto.htm#OS_installation PC Engines provides further important information about individual OS versions and the installation process itself.

For queries or assistance with the implementation of these important updates, please do not hesitate to contact us.

Gladly, we will call you back in case you need help or have questions about the PC Engines BIOS update.

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