From: Robert Hancock <hancockr@shaw.ca>
To: Mark Lord <liml@rtr.ca>
Cc: Jens Axboe <jens.axboe@oracle.com>,
Allen Martin <AMartin@nvidia.com>, Jeff Garzik <jeff@garzik.org>,
linux-kernel <linux-kernel@vger.kernel.org>,
linux-ide@vger.kernel.org, prakash@punnoor.de
Subject: Re: [RFC PATCH] nForce4 ADMA with NCQ: It's aliiiive..
Date: Mon, 16 Oct 2006 17:40:12 -0600 [thread overview]
Message-ID: <4534185C.9060401@shaw.ca> (raw)
In-Reply-To: <4533B0B3.8070205@rtr.ca>
Mark Lord wrote:
> Robert Hancock wrote:
>>
>> I also noticed that I'm still using the default 64KB libata
>> dma_boundary value, this should be 4GB for ADMA mode (but fixed up
>> back to the default if an ATAPI device is connected, same as with the
>> DMA mask).
>
> Be careful of that. The original PDC hardware for ADMA still had
> the "don't cross a 64KB boundary" requirement.
>
> Cheers
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.
In any case, however, I really doubt the NVIDIA ADMA controller shares
this limitation - they provide 32 bits for the region length (standard
ADMA only has 16 bits), which wouldn't be very useful if you couldn't
cross a 64KB boundary..
--
Robert Hancock Saskatoon, SK, Canada
To email, remove "nospam" from hancockr@nospamshaw.ca
Home Page: http://www.roberthancock.com/
next prev parent reply other threads:[~2006-10-16 23:41 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-10-07 8:08 [RFC PATCH] nForce4 ADMA with NCQ: It's aliiiive Robert Hancock
2006-10-07 9:42 ` Prakash Punnoor
2006-10-07 15:54 ` Robert Hancock
2006-10-10 6:44 ` Allen Martin
2006-10-10 7:52 ` Prakash Punnoor
2006-11-30 16:46 ` Prakash Punnoor
2006-12-01 0:07 ` Robert Hancock
2006-10-07 15:28 ` Jeff Garzik
2006-10-07 23:49 ` Robert Hancock
2006-10-10 6:52 ` Allen Martin
2006-10-11 5:07 ` Robert Hancock
2006-10-11 10:30 ` Jens Axboe
2006-10-13 3:17 ` Robert Hancock
2006-10-13 8:04 ` Jens Axboe
2006-10-17 3:34 ` [PATCH] sata_nv ADMA/NCQ support for nForce4 Robert Hancock
2006-10-17 3:37 ` Mark Lord
2006-10-17 4:24 ` Robert Hancock
2006-10-17 16:22 ` Mark Lord
2006-10-17 17:58 ` Roland Dreier
2006-10-17 20:54 ` Mark Lord
2006-10-16 16:17 ` [RFC PATCH] nForce4 ADMA with NCQ: It's aliiiive Mark Lord
2006-10-16 23:40 ` Robert Hancock [this message]
2006-10-17 0:04 ` Mark Lord
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=4534185C.9060401@shaw.ca \
--to=hancockr@shaw.ca \
--cc=AMartin@nvidia.com \
--cc=jeff@garzik.org \
--cc=jens.axboe@oracle.com \
--cc=liml@rtr.ca \
--cc=linux-ide@vger.kernel.org \
--cc=linux-kernel@vger.kernel.org \
--cc=prakash@punnoor.de \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).