Motherboard schematic
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Is it possible to write BIOS code which controls all the hardware components of a motherboard without having the schematic of that motherboard?
well, the answer isn't a simple yes or no.
if you still have the board up and running with its original bios, you can extract a lot of information from the running board without having access the the actual schematics. to the extend a lot of manufacturers used the chipset maker's advice on motherboard layout. so infact a lot of boards have a very very similar design. however they vary very much in details.
anyway: go and check coreboot. there you'll find plenty of sourcecode for initializing motherboard components (and ways to configure it to make it work despite those differences).
if you still have the board up and running with its original bios, you can extract a lot of information from the running board without having access the the actual schematics. to the extend a lot of manufacturers used the chipset maker's advice on motherboard layout. so infact a lot of boards have a very very similar design. however they vary very much in details.
anyway: go and check coreboot. there you'll find plenty of sourcecode for initializing motherboard components (and ways to configure it to make it work despite those differences).
If you email me include [WIMSBIOS] in the subject.