linux-kernel - Re: sata_nv + ADMA + Samsung disk problem

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Message-id: <477D9F4D.5030807@shaw.ca>
Date:	Thu, 03 Jan 2008 20:51:57 -0600
From:	Robert Hancock <hancockr@...w.ca>
To:	Allen Martin <AMartin@...dia.com>
Cc:	Mark Lord <lkml@....ca>, Jeff Garzik <jeff@...zik.org>,
	Tejun Heo <htejun@...il.com>, Gabor Gombas <gombasg@...aki.hu>,
	linux-kernel@...r.kernel.org, linux-ide@...r.kernel.org,
	Kuan Luo <kluo@...dia.com>, Peer Chen <pchen@...dia.com>
Subject: Re: sata_nv + ADMA + Samsung disk problem

Allen Martin wrote:
>  
>>> Dunno about the NVidia version.
>> Theirs works rather differently - the GO bit is there, but there's 
>> another append register which is used to tell the controller 
>> that a new 
>> tag has been added to the CPB list.
>>
>> The only thing we currently use the GO bit for is to switch 
>> between ADMA 
>> and port register mode. Could be there's something we need to 
>> do there, 
>> though, who knows..
>>
> 
> You shouldn't ever need to touch GO other than the ADMA / legacy mode
> switch as you say.
> 
> The NVIDIA ADMA hw is not based on the Pacific Digital core.

That answers that question, I guess. Still guessing at why the 
controller would get stuck in IDLE state with no interrupt raised, then..
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