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From: Stefan Bethke <stb@lassitu.de>
To: FUJITA Kazutoshi <fujita@soum.co.jp>
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Date: Tue, 2 Dec 2008 07:57:06 +0100
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Cc: freebsd-current@freebsd.org
Subject: Re: boot panic with SiS 961 UDMA100 controller
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Am 02.12.2008 um 00:40 schrieb FUJITA Kazutoshi:

> hi,
>
> i cvsuped after a long time (3 months), kernel panics when boot,
> in ata_pci_dmareset()
>
> my pc has
> atapci0: <SiS 961 UDMA100 controller> port  
> 0x1f0-0x1f7,0x3f6,0x170-0x177,0x376,0xff00-0xff0f at device 2.5 on  
> pci0
>
> svn r183723 works, but r183724(and later) cause panic
>
>
> any suggestions?

Showing us at least some part of the panic, if not a full backtrace,  
probably would be helpful.

Try disabling DMA at the loader with
set hw.ata.ata_dma="0"


Stefan

-- 
Stefan Bethke <stb@lassitu.de>   Fon +49 170 346 0140