Sorry to answer myself, but I've found a solution already, thanks to the really perfect OpenBSD documentation (and I'm still quite a beginner). Here's the solution for all who read this list and who want to switch on what the Apple documentation calls "server mode", which is getting a Mac Mini (Intel Core Duo) to power on automatically after a power cut. Can be very useful if the Mac mini is far away in a data center!
The setpci command from the pciutils package didn't work for me, but I've found out that the pcitweak command does exactly what I need. You can switch the "server mode" on with: # pcitweak -w 00:1f:0 -b 0xa4 0x00 and you can check if it's on with: # pcitweak -r 0:1f:0 -b 0xa4 0x00 (would be 0x01 if it's still off)
From an info page: "However, note that in either case the setting is
not preserved across boots. Mac OS X handles this by saving the power-management settings on disk and automatically restoring them at boot; OpenBSD (or Linux) doesn't do that for you, so you will need to arrange to run the appropriate command on boot. Obviously it is important to do this as early in the boot process as possible, so that if the machine hangs or crashes while booting, you can still reboot it." I hope this helps somebody as the Mac mini with its Intel Core Duo makes an excellent server, faster than you'd expect, especially with OpenBSD! :-) Tas.
