From owner-freebsd-current@FreeBSD.ORG  Sat Jan 21 17:42:08 2006
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Date: Sat, 21 Jan 2006 17:41:59 +0000 (GMT)
From: Gavin Atkinson <gavin.atkinson@ury.york.ac.uk>
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To: Nicolas Blais <nb_root@videotron.ca>
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Cc: freebsd-current@freebsd.org
Subject: Re: -CURRENT freeze at boot after update
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On Sat, 21 Jan 2006, Nicolas Blais wrote:
> I did my usual saturday -CURRENT sync (buildworld/kernel) this morning and my
> machine freezes at boot. The freeze occurs right after HD detection, and
> before (or during) mounting partitions :
>
> sc0: <System console> at flags 0x100 on isa0
> sc0: VGA <16 virtual consoles, flags=0x300>
> vga0: <Generic ISA VGA> at port 0x3c0-0x3df iomem 0xa0000-0xbffff on isa0
> ums0: Logitech USB-PS/2 Optical Mouse, rev 2.00/11.10, addr 2, iclass 3/1
> ums0: 3 buttons and Z dir.
> Timecounter "TSC" frequency 2493036546 Hz quality 800
> Timecounters tick every 1.000 msec
> ad0: 78167MB <Maxtor 6Y080L0 YAR41BW0> at ata0-master UDMA133
> acd0: DVDR <HL-DT-ST DVDRAM GSA-4163B/A105> at ata1-master UDMA33
> ad4: 76319MB <Seagate ST380817AS 3.42> at ata2-master SATA150
> <FREEZE HERE>
>
> Booting my kernel.old works fine (fortunatly!).  I'm now looking at recent
> changes that could be the cause between Jan 7 and now.

My first guess would be the DMA dump support in ata:
http://docs.FreeBSD.org/cgi/mid.cgi?200601180914.k0I9EuDE041856

Try backing that out.

Gavin