linux-kernel - Re: 2.6.29-rc libata sff 32bit PIO regression

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Message-ID: <4977B1D1.2010305@ru.mvista.com>
Date:	Thu, 22 Jan 2009 02:37:53 +0300
From:	Sergei Shtylyov <sshtylyov@...mvista.com>
To:	Sergei Shtylyov <sshtylyov@...mvista.com>
Cc:	Alan Cox <alan@...rguk.ukuu.org.uk>,
	Mikael Pettersson <mikpe@...uu.se>,
	Hugh Dickins <hugh@...itas.com>,
	Jeff Garzik <jgarzik@...hat.com>,
	"Rafael J. Wysocki" <rjw@...k.pl>, linux-ide@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: 2.6.29-rc libata sff 32bit PIO regression

Hello, I wrote:

>>>>>  > I've a Dell Precision 670 here (four-year-old EM64T Xeon with 
>>>>> ata_piix)
>>>>>  > which doesn't like your commit 
>>>>> 871af1210f13966ab911ed2166e4ab2ce775b99d
>>>>>  > libata: Add 32bit PIO support.  Full dmesg (and .config) 
>>>>> attached, but
>>>>>  > here's an extract showing the start of the error messages on ata2:
>>>>>             
>>>> Cool - so we need two different 32bit PIO methods - at least 
>>>> according to
>>>> the docs for the AMD we should use entirely 32bit I/O there. Fun fun
>>>>         
>>>    Could you refer me to the exact AMD doc that requires that?
>>>     
>>
>> AMD762 page 82, under DevB:1x40 bit 14 and bit 12
>>   
>
>   What exactly AMD-762 document has this? I'm not seeing it in either 
> stasheet ot software/BIOS design guide. Besides, AMD-762 is a north 
> bridge and doesn't include IDE.

  Finally found it in the AMD-768 datasheet.

>> "Note: only 32-bit writes to the data port are allowed when this bit is
>> set."
>>   
>  
>   Now tell me who forces you to set that bit (I assume it's the write 
> buffer enable) for the ATAPI devices?

   Yes, it's the write buffer enable (about which I have written already).
\
MBR, Sergei


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