linux-kernel - Re: [PATCH] ide: Fix ata_id_has_dword_io to return DWORD I/O support properly

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Date:	Fri, 19 Dec 2008 14:34:37 +0300
From:	Sergei Shtylyov <sshtylyov@...mvista.com>
To:	Sergei Shtylyov <sshtylyov@...mvista.com>
Cc:	Alan Cox <alan@...rguk.ukuu.org.uk>,
	Bartlomiej Zolnierkiewicz <bzolnier@...il.com>,
	Jeff Garzik <jeff@...zik.org>,
	Mario Schwalbe <schwalbe@....tu-dresden.de>,
	linux-kernel@...r.kernel.org,
	Linux IDE mailing list <linux-ide@...r.kernel.org>
Subject: Re: [PATCH] ide: Fix ata_id_has_dword_io to return DWORD I/O support
 properly

Hello, I just wrote:

>> I remain unconvinced we should be looking at it anywhere except specific
>> pure ISA cycle pass through hardware and thus it belongs as a helper for
>>   
>
>   I'm still not getting how drive can support or not support "DWORD 
> I/O" -- you certainly can't have 32-bit I/O cycle on ISA (only on 
> EISA) and you certainly cannot translate 32-bit cycle to the ATA bus. 
> I remember I had some hypotheses before but they turned out to be 
> inconsistent.

   If only two back-to-back I/O cycles weren't providing enough recovery 
time...

MBR, Sergei


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