Figured I would chime in on this as well.
I have v1.7 of this board with a 120 mhz AMD (Am486DX4-100SV8B). The BIOS has an option for write back and write thru (though I later noticed it says 'L1'). This is definitely supported by the CPU.
The L2 cache has been upgraded to 256 K with appropriate sized tag, and that all works in write through mode.
However the system won't seemingly work with write back enabled. I've tried 3 different jumper settings for CPU type (as per documentations) and turning on WriteBack in BIOS, but they all result in either the system straight up freezing at boot, or cachechk will report extremely high results for the megabyte #1 and claim there's no cache installed.
I've tried tweaking every BIOS setting and also 'auto' mode to no avail.
So at this point I can only think I need an updated BIOS, unfortunately I don't have an eeprom tool.
I'm open to other suggestions though 😀
P1: Packard Bell - 233 MMX, Voodoo1, 64 MB, ALS100+
P2-V2: Dell Dimension - 400 Mhz, Voodoo2, 256 MB
P!!! Custom: 1 Ghz, GeForce2 Pro/64MB, 384 MB