linux-kernel - RE: [PATCH] sata_nv: fix ADMA ATAPI issues with memory over 4GB (v3)

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Message-ID: <BD261180E6D35F4D9D32F3E44FD3D901053E8543@EMPBEDEX.empirix.com>
Date:	Fri, 23 Nov 2007 13:47:01 -0500
From:	"Morrison, Tom" <tmorrison@...irix.com>
To:	"Mark Lord" <liml@....ca>
Cc:	"Robert Hancock" <hancockr@...w.ca>,
	"linux-kernel" <linux-kernel@...r.kernel.org>,
	"ide" <linux-ide@...r.kernel.org>, "Jeff Garzik" <jeff@...zik.org>,
	"Tejun Heo" <htejun@...il.com>
Subject: RE: [PATCH] sata_nv: fix ADMA ATAPI issues with memory over 4GB (v3)

Yes, I believe that - otherwise, this problem would have
been a crisis a LONG time ago...:-)

But I do have some more questions in relationship to how 
things are mapped in your environment. I have a flat memory 
map (i.e.: the full 0x0 -- 0x1_0000_0000 is passed to the 32bit 
Linux kernel without any 'holes' and/or reserved areas).

Does your Intel memory map have this same type of flat memory 
model (and thus allow use of the FULL lower 4Gig) - or does it 
reserve areas of lower 4Gig for devices and such - if not - where 
are these reserved areas - and how do the relate to the I/O memory
map for the device?

In other words, I would be very interested in seeing the memory 
map & the PCI memory mapping to see if any overlap/correspond 
to reserve areas of lower 4 Gig (in a linux 32bit mode)...

Tom

________________________________

From: Mark Lord [mailto:liml@....ca]
Sent: Fri 11/23/2007 12:46 PM
To: Morrison, Tom
Cc: Robert Hancock; linux-kernel; ide; Jeff Garzik; Tejun Heo
Subject: Re: [PATCH] sata_nv: fix ADMA ATAPI issues with memory over 4GB (v3)

Morrison, Tom wrote:
> I am hopeful that the sata_mv has this bug (I proved that the
> problem I was experiencing was due to the sata_mv driver
> with 3.75Gig or more of memory)...
> 
> I am on vacation for a week or more ...or I'd tell you today
> if it did have this bug!
..

Yeah, I kind of had your reports in mind when I asked that.  :)

On a related note, I now have lots of Marvell (sata_mv) hardware here,
and an Intel CPU/chipset box with physical RAM above the 4GB boundary.

Cheers

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