lots of "bridge window ... (disabled)" messages

From: Luck, Tony
Date: Mon Mar 29 2010 - 12:57:21 EST


Hi Bjorn,

I just booted Linus latest git tree on my Tukwila system. I'm
seeing a lot of bridge windows marked as disabled. Here's the
start of a diff of dmesg output comparing a kernel from last
week to today's kernel (git 01e7770 vs. b72c409):

< pci 0000:00:01.0: bridge window [mem 0xfff00000 - 000fffff pref] reg reading
---
> pci 0000:00:01.0: bridge window [mem 0xfff00000-0x000fffff pref] (disabled)
222,224c222,224
< pci 0000:00:03.0: bridge window [io f000 - 0000] reg reading
< pci 0000:00:03.0: bridge window [mem 0xfff00000 - 0x000fffff] reg reading
< pci 0000:00:03.0: bridge window [mem 0xfff00000 - 000fffff pref] reg reading
---
> pci 0000:00:03.0: bridge window [io 0xf000-0x0000] (disabled)
> pci 0000:00:03.0: bridge window [mem 0xfff00000-0x000fffff] (disabled)
> pci 0000:00:03.0: bridge window [mem 0xfff00000-0x000fffff pref] (disabled)
233c233
< pci 0000:00:05.0: bridge window [mem 0xfff00000 - 000fffff pref] reg reading
---
> pci 0000:00:05.0: bridge window [mem 0xfff00000-0x000fffff pref] (disabled)

... many more such diffs.

This is the same system that you helped out with a couple of months
ago that had some issues in _CRS tables with ranges marked as
"consumer". The BIOS team fixed the one range that was needed
to allow access to my EHCI - but they didn't touch anything else.

Are these new checks related to the same sort of issues in _CRS?
Or is this some other stuff? I don't appear to have lost access
to any devices in today's kernel.

-Tony
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