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From: John Baldwin <jhb@freebsd.org>
To: Anton Shterenlikht <mexas@bristol.ac.uk>
Date: Fri, 18 May 2012 10:48:52 -0400
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Cc: freebsd-current@freebsd.org
Subject: Re: updating from r231158 to 234465: mounting from ufs:/dev/ad4s1a
	failed with error 19
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On Wednesday, May 16, 2012 11:30:19 am Anton Shterenlikht wrote:
> er.. yes, of course it helped.
> 
> My problem was that I couldn't boot.
> So, I presumed the very existence of dmesg.boot
> showed that your patches (both of them) work fine.
> But, sorry, I could've been more explicit.
> All seems to work, including sound and wireless.

Hmm.  Can you try one more thing.  Can you boot an unmodified kernel (no 
patches) but set 'hw.pci.enable_io_modes=0' from the loader?

-- 
John Baldwin