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Message-ID: <48108208.8060302@rtr.ca>
Date: Thu, 24 Apr 2008 08:50:16 -0400
From: Mark Lord <liml@....ca>
To: Sergei Shtylyov <sshtylyov@...mvista.com>
Cc: Alan Cox <alan@...rguk.ukuu.org.uk>, Tejun Heo <htejun@...il.com>,
Jeff Garzik <jeff@...zik.org>, Adrian Bunk <bunk@...nel.org>,
linux-kernel@...r.kernel.org, linux-ide@...r.kernel.org
Subject: Re: [2.6 patch] select ATA_SFF
Sergei Shtylyov wrote:
> Alan Cox wrote:
>
>>> Sergei Shtylyov wrote:
>
>>>>>> Jeff, Tejun, what "sff" in the file name actually means? Isn't
>>>>>> it strange that the drivers lacking DMA support or not really
>>>>>> compliant with SFF-8038i have to link with this file?
>
>>>>> Maybe it should be libata-tf and libata-bmdma, but sff (sans bmdma)
>>>>> and bmdma is acceptable, hopefully, right?
>
>>>> What's sff sans bmdma?
>
>>> Supposed to be TF interface. IIRC, the SFF term was first from Alan
>>> although it's entirely possible that I misunderstood it and used it
>>> in the wrong way. Alan, can you please clear up the confusion?
>
>> The SFF/Intel spec is for PCI IDE (BMDMA or otherwise), so it covers and
>> defines all the common bits of the IDE interface on PCI (and in defining
>> the legacy interface conveniently documents the extended ST-412 interface
>> used by ATA and "pre-ATA" IDE/EIDE controllers).
>
> If you mean SFF-8038i (which can indeed be named "SFF/Intel"), it
> documents *only* BMDMA. If you mean something else, please be more
> precise.
..
The "Intel PCI IDE Controller Specification Revision 1.0 3/4/94" doesn't mention
bmdma at all, but does document the taskfile register addresses.
It defers to ATA-1 for actual taskfile descriptions/functionality, though.
There's nothing particularly bad about the current naming we use, though.
Cheers
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