linux-kernel - Re: What's in libata-dev.git

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Date:	Mon, 11 Sep 2006 19:05:11 +0400
From:	Sergei Shtylyov <sshtylyov@...mvista.com>
To:	Jeff Garzik <jeff@...zik.org>
Cc:	Alan Cox <alan@...rguk.ukuu.org.uk>, linux-ide@...r.kernel.org,
	linux-kernel@...r.kernel.org, Andrew Morton <akpm@...l.org>,
	Linus Torvalds <torvalds@...l.org>
Subject: Re: What's in libata-dev.git

Hello.

Jeff Garzik wrote:
>> Ar Llu, 2006-09-11 am 17:47 +0400, ysgrifennodd Sergei Shtylyov:

>>>     It's not likely I'll be able to try it. But I'm absolutely sure 
>>> that drive aborted the read commands with the sector count of 0 (i.e. 
>>> 256 actually). The exact model was IBM DHEA-34331.

>> Several people reported this problem when we tried 256 years ago in
>> drivers/ide. You might want to do 256 for SATA Jeff but please don't do
>> 256 for PATA. Reading specs is too hard for some people ;)

>> Some drives abort the xfer, some just choked.

> Where in drivers/ide is it limited to 255?

    Hm, indeed, it's 256 there...
    But the changelog in ide-probe.c suggests the were limited to 255 once 
upon a time. Also, hd.c still has this limit, and changelog talling why it was 
so...

WBR, Sergei
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