[coreboot] Bridge Mem Window/Prefetch Window

Myles Watson mylesgw at gmail.com
Thu Feb 5 21:21:25 CET 2009


On Mon, Feb 2, 2009 at 9:01 AM, Dan Lykowski <engineerguy3737 at yahoo.com> wrote:
> CoreBoot Kernel Log:
> [    0.412025] PCI: Bridge: 0000:00:01.0
> [    0.416027]   IO window: 1000-1fff
> [    0.420032]   MEM window: 0xfc500000-0xfc6fffff
> [    0.427975]   PREFETCH window: 0x00000000f0000000- 0x00000000f7ffffff
> [    0.440718] PCI: Bridge: 0000:00:04.0
> [    0.448082]   IO window: 2000-2fff
> [    0.454929]   MEM window: 0xfc700000-0xfc7fffff
> [    0.464029]   PREFETCH window: disabled.
> [    0.471919] PCI: Bridge: 0000:00:07.0
> [    0.479285]   IO window: 3000-3fff
> [    0.486133]   MEM window: 0xfc000000-0xfc4fffff
> [    0.495233]   PREFETCH window: disabled.
> [    0.503122] PCI: Bridge: 0000:00:14.4
> [    0.510485]   IO window: disabled.
> [    0.517322]   MEM window: disabled.
> [    0.524338]   PREFETCH window: disabled.
>
> Closed BIOS:
> [    0.412025] PCI: Bridge: 0000:00:01.0
> [    0.416027]   IO window: c000-cfff
> [    0.420032]   MEM window: 0xfdd00000-0xfdefffff
> [    0.427975]   PREFETCH window: 0x00000000d0000000- 0x00000000dfffffff
> [    0.440718] PCI: Bridge: 0000:00:04.0
> [    0.448082]   IO window: e000-efff
> [    0.454929]   MEM window: 0xfda00000-0xfdafffff
> [    0.464029]   PREFETCH window: 0x00000000fd900000 - 0x00000000fd9fffff
> [    0.471919] PCI: Bridge: 0000:00:07.0
> [    0.479285]   IO window: d000-dfff
> [    0.486133]   MEM window: 0xfd000000-0xfd7fffff
> [    0.495233]   PREFETCH window: 0x00000000fdf00000-0x00000000fdffffff
> [    0.503122] PCI: Bridge: 0000:00:14.4
> [    0.510485]   IO window: b000-bffff
> [    0.517322]   MEM window: 0xfdc00000-0xfdcfffff
> [    0.524338]   PREFETCH window: 0x00000000fdb00000-0x00000000fdbfffff

I think lspci -tv would help us know what's going on here.

What devices are behind the bridges that don't have prefetchable
memory allocated to them?  Is it space reserved for hot-plug?

Thanks,
Myles




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