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SubjectRe: 2.6.17-rc1-mm1
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On Wed, 2006-04-05 at 07:38, Luck, Tony wrote:
> On Tue, Apr 04, 2006 at 01:45:04AM -0700, Andrew Morton wrote:
> > - VGA on ia64 is broken - the screen comes up blank. But ia64 otherwise
> > seems to work OK. I didn't have time to investigate.
>
> Broken in base 2.6.17-rc1 too :-( VGA comes up and prints a
> few messages, and then goes wonky and dies. Comparing
> what I _think_ I saw with the dmesg output, it appears to
> die here:
>

The wild VGA comes from the patch which changed ioremap.

Now ioremap would not remap memory to region 6 unless that memory is
marked as EFI_MEMORY_UC by EFI.

Unfortunately on the Tiger Machine, VGA ram base was marked as
EFI_MEMORY_WB instead of EFI_MEMORY_UC...

So you can see the problem disappear if change VGA_MAP_MEM to use
ioremap_nocache.

But I am not quite sure if we can fully trust EFI on this attribute.

Zou Nan hai
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