ASUS P5B

ASUS P5B

[Piotr]

Hello i have a problem with my ASUS p5b mobo, i am a gentoo user and i'm
getting this error while booting my system from newest gentoo-sources
2.6.22 (this also happens on earlier ver. of kernel) i get this message:

"PCI: BIOS Bug: MCFG area at f0000000 is not E820-reserved
PCI: Not using MMCONFIG."

and i dunno how can this be fixed, i can start to boot my kernel with
nommconf but i don' like to have problems like that, and maybe some of
you ppl have a better solution for this problem?

Re: ASUS P5B

[Robert Hancock]

Piotr wrote:
> Hello i have a problem with my ASUS p5b mobo, i am a gentoo user and i'm
> getting this error while booting my system from newest gentoo-sources
> 2.6.22 (this also happens on earlier ver. of kernel) i get this message:
> 
> "PCI: BIOS Bug: MCFG area at f0000000 is not E820-reserved
> PCI: Not using MMCONFIG."
> 
> and i dunno how can this be fixed, i can start to boot my kernel with
> nommconf but i don' like to have problems like that, and maybe some of
> you ppl have a better solution for this problem?

It's not a huge problem, it mainly just means that extended PCI Express 
configuration space can't be accessed, and that doesn't seem to be used 
much currently.

Actually, the E820 validation check in mainline currently is too strict 
as the MMCONFIG area is not required to be reserved in the E820 table. 
There's a patch in the -mm tree to validate this against ACPI 
motherboard resources instead, as well as a fix to a PCI probing issue 
that caused problems on some Intel boards with MMCONFIG enabled. You can 
try an -mm kernel and see if this is resolved.

-- 
Robert Hancock      Saskatoon, SK, Canada
To email, remove "nospam" from hancockr@nospamshaw.ca
Home Page: http://www.roberthancock.com/