linux-kernel - Re: [2.6 patch] select ATA

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Message-ID: <480DE9E8.2070809@ru.mvista.com>
Date:	Tue, 22 Apr 2008 17:36:40 +0400
From:	Sergei Shtylyov <sshtylyov@...mvista.com>
To:	Tejun Heo <htejun@...il.com>
Cc:	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

Tejun Heo wrote:

>>    ADMA is not SFF-8038i compilant, it's the IDE DMA spec of its own. 
>> And I'm seeing references to libata-sff.c... confusing.

> In libata, SFF is used for controllers which have TF interface

    I can't figure out to which SFF specs this refers then... althought I'm 
not really familiar with them well enough.

> and BMDMA 
> is used for the BMDMA part of SFF-8038i.

    Is there any other part in it? One concerning PCI?

>  I think this is the source of confusion here.

    Yes.

>>    Looks like there's no clean separation within libata-sff.c itself 
>> between SFF-8038i (BMDMA spec) and IDE registers itself -- that 
>> confused me: at first I thought there's a big issue with a patch. :-/

>>    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?

> Thanks.

WBR, Sergei
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