linux-kernel - Re: Kernel Summit request for Discussion of future of ATA (libata) and IDE

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Date:	Wed, 06 Aug 2008 15:17:38 +0400
From:	Sergei Shtylyov <sshtylyov@...mvista.com>
To:	Sergei Shtylyov <sshtylyov@...mvista.com>
Cc:	Alan Cox <alan@...rguk.ukuu.org.uk>,
	Robert Hancock <hancockr@...w.ca>,
	Bartlomiej Zolnierkiewicz <bzolnier@...il.com>,
	James Bottomley <James.Bottomley@...senpartnership.com>,
	ksummit-2008-discuss@...ts.linux-foundation.org,
	linux-kernel <linux-kernel@...r.kernel.org>,
	linux-ide <linux-ide@...r.kernel.org>
Subject: Re: Kernel Summit request for Discussion of future of ATA (libata)
 and IDE

Hello, I wrote:

>>>>>> supported. I couldn't track down where that bit was actually 
>>>>>> defined in the first place, all the way back to ATA-1 it seems to 
>>>>>> be indicated as reserved. Actually, I'm not sure why the drive 
>>>>>> cares in the first place, it would seem like a pure host 
>>>>>> controller issue..
>>>>>>             
>>>>> It goes back before IDE into the depths of the original compaq 
>>>>> spec. When
>>>>> you have a device wired basically directly to the ISA bus 
>>>>> (original IDE)
>>>>>         
>>>>    ISA has only 8/16-bit data bus, so it could not have mattered 
>>>> there...     
>>>
>>> Depends what a 32bit I/O looks like on the 16bit bus - timing wise.
>>>   
>>
>>   Two 16-bit reads at addresses 0x1x0 and 0x1x2 with the programmed 
>> recovery time, IIRC... It's just occured to me that in case of the 
>> 16-bit bus it should be how the drive treated the accesses at address 
>> 0x1x2 with IOCS16 asserted that could have mattered. If it honored 
>> them, 32-bit I/O could have worked even on a dumb ISA "controller", 
>> if not -- no way (unless you really had *something* between the ISA 
>> and the IDE cable).
>
>    Oh, -IOCS16 is driven by device, not host. I give up then. :-)
>

   OTOH, it definitely could work if the drive asserted it for the I/O 
port 0x1x2 at least for the data transfer phase (and probably even if it 
always asserted -IOCS16 for this address).
That pre-historic word indeed could have made sense then...

MBR, Sergei


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