Hi,
Cutting PCI reset is clever. I know SBxxx from AMD tend to have ROMCS (AD24 pin) signal routed to B14 of PCI connector. SB 820 manual:
Enable ROM Straps to select ROM type 0V Reserved ** 3.3V Required setting (use ROMTYPE straps to determine the ROM type) **Note: Strap option was originally for booting from PCI memory; the feature is not supported, as it has not been productized.
Not sure how it works on SB600/SB700 will check evening.
Thanks Rudolf