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From: John Baldwin <jhb@freebsd.org>
To: Don Lewis <truckman@freebsd.org>
Subject: Re: Thinkpad R60 hangs when booting recent 8.4-STABLE
Date: Wed, 30 Apr 2014 12:25:22 -0400
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 (bigwig.baldwin.cx); Wed, 30 Apr 2014 12:25:41 -0400 (EDT)
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On Tuesday, April 29, 2014 9:17:19 pm Don Lewis wrote:
> On 29 Apr, John Baldwin wrote:
> > On Monday, April 28, 2014 8:56:03 pm Don Lewis wrote:
> 
> I just took a closer look at the dmesg output from the two kernels.
> 
> >> agp0: <Intel 82855 host to AGP bridge> on hostb0
> >> hostb0: Reserved 0x10000000 bytes for rid 0x10 type 3 at 0xd0000000
> 
> The above line is different with the r262226 kernel:
>  hostb0: Reserved 0x10000000 bytes for rid 0x10 type 3 at 0

Yes, a resource at 0 is going to break things.  9.2 has the NEW_PCIB option
enabled.  You can try enabling that for 8.4 to see if it fixes this issue.
If it does, it narrows down where to look for the bug.

> That looks significant to me.
> 
> >> agp0: allocating GATT for aperture of size 256M
> >> [Hangs here]
> > 
> > Humm, the other mails on this showed an address for what was allocated
> > here I thought during a verbose boot.
> > 
> > Let me see if I can get my X220 to reproduce this on an 8.x kernel.

This did not succeed in breaking. :(

-- 
John Baldwin