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SMU(4) Device Drivers Manual (macppc) SMU(4)

smu
Apple System Management Unit

smu? at mainbus0

The smu driver provides support for the System Management Unit found on Apple iMac G5 and some Power Mac G5 machines.
The System Management Unit controls the fans in these systems. It also contains the real-time clock and an I2C controller.

iic(4), intro(4)

The smu driver first appeared in OpenBSD 3.9.

The smu driver was written by Mark Kettenis.

Fan control is not implemented yet.
June 18, 2018 OpenBSD-current