linux-kernel - Re: [RFC PATCH] nForce4 ADMA with NCQ: It's aliiiive..

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Message-ID: <45341E08.9040100@rtr.ca>
Date:	Mon, 16 Oct 2006 20:04:24 -0400
From:	Mark Lord <lkml@....ca>
To:	Robert Hancock <hancockr@...w.ca>
Cc:	Mark Lord <liml@....ca>, Jens Axboe <jens.axboe@...cle.com>,
	Allen Martin <AMartin@...dia.com>,
	Jeff Garzik <jeff@...zik.org>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	linux-ide@...r.kernel.org, prakash@...noor.de
Subject: Re: [RFC PATCH] nForce4 ADMA with NCQ: It's aliiiive..

Robert Hancock wrote:
> Mark Lord wrote:
>> Robert Hancock wrote:
..
>> Be careful of that.  The original PDC hardware for ADMA still had
>> the "don't cross a 64KB boundary" requirement.
..
> That is part of the ADMA spec - but in that case, how come the 
> pdc_adma.c driver sets the dma_boundary in the SCSI host template to 
> 4GB? That seems wrong.

Ah, you are correct.  My memory is fading of such things.
The PDC parts are good for 2^34 transfer sizes (bytes).

Cheers
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