here is the deal - downloaded and installed fc4 test3 on my machine (2x246 opterons, Tyan S2895 mobo, 4x1 gigs of ECC ram, nvidia 6600gt). Running the default kernel 64smp, or whatever its name.

If I enable software-based PCI mem hole remapping in my mobo's bios then KDE hangs (comp completely freezes) after opening 1 or 2 web pages in Firefox or any other bundled browser. If it's set to disabled then no problems, however then Linux does not see the full 4 gigs of my ram due to the PCI bus map (it does see the full 4gigs if I set the memhole remap to be "software"-based). Anyone else is having the same issues with software memhole remap?

I didn't try any other distros or OS's to compare, so I don't yet know whether it's my hardware, bug in FC4, bug in Linux kernel, bug in some driver, or some other configuration issue (Although, I've read elsewhere that software based memhole remap works just fine in 64-bit XP on the mobo I use - so I know that the mobo seems to work ok with this feature).

Probably your best bet for a reply on this would be to post on fedora-test-list.

thanks - I'll try out that list.