linux-kernel - Re: More than 2Gb problem (dvb related) ?

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Date:	Sat, 28 Apr 2007 01:24:45 +0200
From:	"Markus Rechberger" <mrechberger@...il.com>
To:	"Robert Hancock" <hancockr@...w.ca>
Cc:	"Gregoire Favre" <Gregoire.Favre@...il.com>,
	linux-kernel@...r.kernel.org, linux-dvb@...uxtv.org
Subject: Re: More than 2Gb problem (dvb related) ?

Does this only happen with DVB and not with analogue TV (I know there
are some cx88 hybrid devices out there, I recently got one but
couldn't tested it yet ..)?

Markus

On 4/28/07, Robert Hancock <hancockr@...w.ca> wrote:
> Gregoire Favre wrote:
> > Hello,
> >
> > I have a computer (mother Asus Commando) with 4x1Gb Ram.
> >
> > If I start without the BIOS remap memory, my BIOS and linux just see 2Gb
> > of ram, and DVB apps works just great.
> >
> > When I enable the remapping of the memory, my BIOS and linux just see
> > the whole 4Gb but then, I can tune to any transponder without problem,
> > but I am unable to get a TS...
> >
> > I have tested it with vdr/kaffeine/mplayer.
> >
> > szap/kaffeine/vdr get the lock just well.
> >
> > I had already asked about this on just linux-dvb ml, but maybe I am the
> > first one to try DVB with a system with more than 2 Gb as I didn't
> > receive any further info as someone get it working or not with such
> > amount of ram.
> >
> > Anyone got an idea on what could be done to solve this issue ?
> >
> > PLEASE CC to me all message in lkml as I am not subscribed to this ml :)
>
> Sounds like the cx88 driver is not using the DMA API properly to set up
> proper mappings, this will blow up if it tries to access memory above
> the 4GB mark if the device cannot do >32bit DMA..
>
> --
> Robert Hancock      Saskatoon, SK, Canada
> To email, remove "nospam" from hancockr@...pamshaw.ca
> Home Page: http://www.roberthancock.com/
>
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-- 
Markus Rechberger
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