Gigabyte GA-6RX: Tualatin Support

[dm-]

Hello there

https://theretroweb.com/motherboards/s/gigabyte-ga-6rx

I'm trying to use unsupported cpu (pentium III tualatin) and the board is stuck on post code 29.

cpu is pin modded, and third party flashed bios (award) is booting successfully, but there is another issues with missing i/o ports and wrong pci registers so most of the devices does not work.

i tried to disassemble bios and there is a couple of  cpuid checks in the code
tried to "nop" jz instructions but still code 29, probably wrong place.

29 maybe is a msr codes read/write operations...

any help will be appreciated.