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SubjectRe: [PATCH 2/3] pci: don't assume pref memio are 64bit -v2
On Sat, Apr 18, 2009 at 01:44:51AM -0700, Yinghai Lu wrote:
> and BIOS set
> [ 0.240007] pci 0000:00:01.0: bridge 64bit mmio pref: [0xbdf00000-0xddefffff]

An obvious BIOS bug, the bridge base overlaps the physical low RAM
(0x00000000-0xc0000000). Technically speaking, this nonsense *happens*
to work on Intel hardware, so it seems to be quite common bug nowadays -
BIOS writers get lost in ACPI and other "useful" stuff contradicting
the PCI specs.
...

> + /* don't allocate too high if the pref mem doesn't support 64bit*/
> + if ((res->flags & (IORESOURCE_PREFETCH | PCI_PREF_RANGE_TYPE_64)) ==
> + IORESOURCE_PREFETCH)
> + max = 0xffffffff;

This effectively destroys non-x86 64-bit arches. You've been told about
that before, so I'm really surprised to see this "patch" once again.

Categorically NACKed.

P.S. I recall that I had a patch that addressed the issue, and Ingo
made some reasonable comments about it. Will post it tomorrow.

Ivan.


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