Bug 174893 – [2.6.20 regression] boot hangs after "Cannot adjust BAR0 (not I/O)"

• Status: RESOLVED FIXED
• Product: Gentoo Linux

[Description Simon Cooper 2007-04-17 09:54:52 UTC]

On booting 2.6.20-r6, I get the following message and startup hangs:

0000:00:d0.0: Cannot adjust BAR0 (not I/O)

d0.0 is the IDE interface (nVidia Corporation MCP51 IDE (rev f1))

I have an MCP51 chipset. It is a known problem, see URL for lkml discussion

[Comment 1 Daniel Drake (RETIRED) 2007-04-18 14:11:52 UTC]

Which is the last good known working kernel? Is this the last message that appears before the hang? Have you tried backing out the patch referenced there?

[Comment 2 Simon Cooper 2007-04-18 14:59:50 UTC]

yup, backing out the patch makes the kernel bootable. Also had the same problem with -r5

[Comment 3 Daniel Drake (RETIRED) 2007-04-18 15:27:56 UTC]

Which is the last good known working kernel? Is this the last message that
appears before the hang?

[Comment 4 Simon Cooper 2007-04-18 17:21:23 UTC]

oh, sorry. Latest working kernel is 2.6.20-r3, the last three messages are:

ACPI: PCI Root Bridge [PCI0] (0000:00)
ACPI: Assume root bridge [\_SB_.PCI0] bus is 0
0000:00:0d.0 Cannnot adjust BAR0 (not I/O)

Thats the only error that I can see

[Comment 5 Adrian Bunk 2007-04-29 20:28:47 UTC]

This issue should be fixed in 2.6.21 and 2.6.20.11 .

[Comment 6 Daniel Drake (RETIRED) 2007-04-29 21:16:56 UTC]

Thanks Adrian.

upstream commit is
http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commitdiff_plain;h=01abc2aa0f447bce2f6beb06dd0607ba0f01c5bb

[Comment 7 Simon Cooper 2007-04-30 09:21:42 UTC]

fixed in gentoo-sources-2.6.21

[Comment 8 Daniel Drake (RETIRED) 2007-05-02 18:29:19 UTC]

also fixed in gentoo-sources-2.6.20-r8