Re: [PATCH] Intel Alder IOAPIC fix

[Linus Torvalds]

On Mon, 12 Jan 2004, James Bottomley wrote:
>
> OK, with the patch below (to insert_resource) I know get the IO APIC
> successfully inserted under the reserved fixmap resources:
> 
> /proc/iomem still looks very odd:
> 
> fec00000-fec08fff : reserved
>   fec01000-fec013ff : 0000:00:0f.0
> fffffc00-ffffffff : 0000:00:0f.0
>   fffffc00-ffffffff : 0000:00:0f.0
>     fffffc00-ffffffff : 0000:00:0f.0
>       fffffc00-ffffffff : 0000:00:0f.0
>         fffffc00-ffffffff : 0000:00:0f.0
>           ffe80000-ffffffff : reserved
> 
> unfortunately, because BARs 1-5 cover the same region.

I think BARs 1-5 don't exist at all. Being set to all ones is common for
"unused" (it ends up being a normal result of a lazy probe - you set all 
bits to 1 to check for the size of the region, and if you decide not to 
map it and leave it there, you'll get the above behaviour).

I suspect only BAR0 is actually real.

What's in that ffe80000-ffffffff region that the BIOS has allocated,
anyway?

		Linus
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