(Repost from an earlier mail to the mailing list, mebbe it'll attract the right sort of attention here... and mebbe I'll figure something useful out now that I've got the VIA datasheet)
...and apologies for posting this in the OpenBIOS section. Wow, ya go away for a few hours and the whole BBS changes.
I don't know what they do, but I've spent some time tracing them out on the PCB. They all go to the VIA chipset, two through little resistor-pack-looking things near the BGA, and the other two to unknown pins in the BGA itself.
Pics to follow, just haven't had time to make 'em intelligible to anyone but myself yet. Hopefully later tonight?
Short version - four traces go beneath the BIOS socket, and emerge from beneath it, running to a small cluster of four vias between R117 of the modem and the SO-DIMM slot. Then it's a long way to a pair of 10-pin SMT devices marked either "103" or "1002" (as in 10*02 :) just to the right of the VIA chip. The devices are electronically identical, just named differently, and changes from one unit to another do not
constitute a motherboard revision.)
