Reboot after power failure requires setting the AFTERG3 bit in the appropriate device and register, every boot. The Mac Pro in question uses the Intel 5400 chipset (datasheets here). The I/O controller hub datasheet, pg. 191, points to the following location of the AFTERG3 bit:
- Bit name:
AFTERG3_EN - Register: General PM Configuration 3 Register:
GEN_PMCON_3 - Location:
D31:F0:A4h - Bit: 0
- Default value: 0
I'm guessing I need to set this bit to 1 in a startup script. How can I translate this location into the correct setpci command?
Similar to this question about a Mac mini.
