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BIOS(4) Device Drivers Manual (amd64) BIOS(4)

a driver for PC Firmware, aka BIOS

bios0 at mainbus0

OpenBSD provides support for a limited subset of PC firmware (aka BIOS) subsystems on this platform. Only SMBIOS is supported.

SMBIOS provides detail about system hardware configuration and is used to attach ipmi(4) on most systems.

intro(4), ipmi(4)

The bios driver was introduced to this platform in OpenBSD 4.0.
May 31, 2007 OpenBSD-current