[gPXE-devel] [PATCH] [romprefix] Consider PCI3 init-time segment in BIOS area insane
Michael Brown
mbrown at fensystems.co.uk
Thu May 27 11:28:53 EDT 2010
On Thursday 27 May 2010 14:58:47 Kyle Kienapfel wrote:
> Intel disabled
> 03:02.0 CD00 PCI3.00!DE00 PnP BBS PMM0042 at 08 CD00
> 03:03.0 CE00 PCI3.00!DE00 PnP BBS PMM004A at 08 CE00
>
> Intel Enabled
> 03:02.0 CE00 PCI3.00!DE00 PnP BBS PMM0043 at 08 CE00
> 03:03.0 CF00 PCI3.00!DE00 PnP BBS PMM004B at 08 CF00
OK, that fairly conclusively shows that the runtime segtime is genuinely
erroneous.
Joshua: I can't immediately think of any better fix for this problem than your
"init-time >= 0xa000 implies runtime=init-time".
However, I think it's worth noting that pretty much all the PCI3-related
quirks are consistent with a pattern of a PCI3 BIOS detecting the iPXE/gPXE
ROM as a non-PCI3 ROM. (A sensible PCI3 BIOS would always set the runtime
segment equal to the init-time segment for a non-PCI3 ROM, just as a sanity
measure, but this clearly isn't happening.)
I think it would be worth investing some time to discover if and why these
BIOSes are failing to detect iPXE/gPXE ROM as a PCI3 ROM. This might
potentially eliminate almost all of the quirks that we're seeing.
Michael
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