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

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Message-ID: <F72FA20C31DD4F4C997B91C5B3690A09505598@hqemmail07.nvidia.com>
Date:	Thu, 3 Jan 2008 16:41:52 -0800
From:	"Allen Martin" <AMartin@...dia.com>
To:	"Robert Hancock" <hancockr@...w.ca>, "Mark Lord" <lkml@....ca>
Cc:	"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

 
> > 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.
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