NVRAM WakeUp

This is only lightly tested, as I only wanted to check whether it works at
all. It did. :)

You need to reboot for the NVRAM time to be taken over by the BIOS, i.e.
first run nvram-wakeup, then reboot, then immediately halt, then leave the
machine in this state and it will boot at the set time.

(Maybe you should collect this information for the different motherboards
as well; what reboots etc. are necessary to make it work. The info should
be in a machine-readable format, so eventually Linux distributions can
automatically use it.)

################################################
## Mainboard autodetection information:
##
## - Mainboard vendor: "Gigabyte Technology Co., Ltd."
## - Mainboard type: "EG45M-DS2H"
## - Mainboard revision: "x.x"
## - BIOS vendor: "Award Software International, Inc."
## - BIOS version: "F2"
## - BIOS release: "07/18/2008"

addr_stat = 0x46
addr_day = 0x47
addr_hour = 0x48
addr_min = 0x49
addr_sec = 0x4A
addr_chk_h = 0x6F
addr_chk_l = 0x70