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From: Ian Lepore <freebsd@damnhippie.dyndns.org>
To: Harry Newton <hn@yewbarrow.net>
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Date: Tue, 28 Feb 2012 13:08:41 -0700
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Cc: freebsd-stable@freebsd.org
Subject: Re: Regression between 9-RELEASE and 9-STABLE [PCIB ?]
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On Tue, 2012-02-28 at 19:15 +0000, Harry Newton wrote:
> 9-RELEASE works fine. csup to 9-STABLE and make buildworld kernel etc
> gives a system the hangs during the boot process. There are no error
> messages during the part boot, and no panic. Last messages before hang
> are:
> 
> pcib0: <ACPI Host-PCI bridge> port 0xcf8-0xcff on acpi0
> pci0: <ACPI PCI bus> on pcib0
> 
> I am stumped about how to diagnose this, and would be _very_ grateful
> for any suggestions.
> 
> When it's hung I can't force a break to debugger (BREAK_TO_DEBUGGER)
> in kern conf: I imagine I'm too early in the boot sequence.
> 
> - Harry
> 

I assume booting verbose doesn't provide any more clues?  I've sometimes
gotten an extra clue from a hang during boot by building with option
BUS_DEBUG.  Even if you don't suspect the newbus routines as directly
being the problem, sometimes you get a bit more info about what was
happening at the time of lockup.

-- Ian