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From: John Baldwin <jhb@freebsd.org>
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	(bigwig.baldwin.cx); Fri, 27 Apr 2012 09:40:21 -0400 (EDT)
Cc: Anton Shterenlikht <mexas@bristol.ac.uk>
Subject: Re: updating from r231158 to 234465: mounting from ufs:/dev/ad4s1a
	failed with error 19
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On Thursday, April 26, 2012 6:42:15 pm Anton Shterenlikht wrote:
> I was updating from r231158 to 234465
> (amd64 laptop Compaq 6715s),
> and I think I must've messed someting
> up in the kernel config. Now I get
> build error, panic of a loader error,
> depending on which kernel I build.
> 
> *********************************************************
> 
> If I build GENERIC, I get:
> 
> (transcribed by hand)
> 
> mountroot: waiting for device /dev/ad4s1a
> Mounting from ufs:/dev/ad4s1a failed with error 19.
> 
> mountroot> ?
> 
>  List of GEOM managed disk devices:
> 
>   cd0
> 
> mountroot>

Hmm, so GENERIC is not finding ad4.  Can you look in the dmesg
(using scroll-lock) to see if GENERIC finds your ATA controller
ok?

> The device is certainly correct in r231158:
> 
> BUZI> df
> Filesystem  512-blocks     Used    Avail Capacity  Mounted on
> /dev/ad4s1a  101554068 46474368 46955376    50%    /
> devfs                2        2        0   100%    /dev
> BUZI> 
> 
> *********************************************************
> 
> If I add
> 
>  device atadisk
> 
> to GENERIC, then I get this linking error:

Yes, you aren't supposed to use 'atadisk' with ATA_CAM.  See the UPDATING 
entry 20110424 for more details on that.

However, can you obtain a verbose dmesg from your old kernel?

-- 
John Baldwin