On Wed, 10 Feb 2016, Frank Scheiner wrote: > >Description: > I'm trying to netboot an ALi 1487/1489 based PCI motherboard (Abit PB-4) > with an AMD 5x86 133 processor with the GENERIC i386 kernel of OpenBSD > 5.8. But the kernel always drops to ddb after the "cpu0 at mainbus0: > (uniprocessor)" message. Using the 5.7 kernel or the kernel of > 5.9-current build #1540 works ok though. I face the same problem when > using another AMD processor (an AMD DX4 100). Like the AMD 5x86 the AMD > DX4 is also working with the 5.7 and 5.9-current build #1540 kernel but > crashes with the 5.8 kernel. Interestingly, when using an Intel DX4-S > 100 OVERDRIVE processor the same 5.8 kernel boots through without a > problem.
Yep, this was a regression in 5.8-release that wasn't caught until some time after release. Once jsg@ hit it we fixed the bad part of the change I had made (I assumed the %cr4 register is always present, but it isn't on "most 486s"), so it'll stay fixed in 5.9. Philip Guenther
