From: "Régis Odeyé" <regis.odeye@kontron•com>
To: Matt Sealey <matt@genesi-usa•com>
Cc: linuxppc-dev@ozlabs•org
Subject: Re: Extended Addressing Mode
Date: Wed, 22 Oct 2008 16:18:54 +0200 [thread overview]
Message-ID: <48FF364E.9070701@kontron.com> (raw)
In-Reply-To: <48FF2DDE.9060301@genesi-usa.com>
Matt Sealey wrote:
>
> I'd also be interested in any work done to enable non-contiguous
> memory areas. Reading the docs for the MPC8641D though I am not sure
> you can set up LAWs for it?
>
> One thing I wanted to try was installing 4GB in a system and
> "overlapping" IO (since there is very little of it on a stock
> MPC8641DHPCN) in the top ~256MB-512MB, but I am fairly sure this is
> NOT supported because of the way the LAWs work, and also the alignment
> of the LAWs means it is not fine enough granularity to map between 2GB
> and 4GB into a window (you can have 2GB or 4GB but not some more
> arbitrary value?)
>
On my point of view, LAWs sizes are power of 2 and should be aligned to
the window size. But there is 10 LAWs you can combine to achieve quite a
lot of different mappings.
Regards.
--
Régis ODEYE
Kontron Modular Computers SA
150, rue M. Berthelot / ZI Toulon Est / BP 244 / Fr 83078 TOULON Cedex 9
Phone: (33) 4 98 16 34 86 Fax: (33) 4 98 16 34 01
E-mail: regis.odeye@kontron•com Web : www.kontron.com
next prev parent reply other threads:[~2008-10-22 14:19 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-10-22 8:59 Extended Addressing Mode Régis Odeyé
2008-10-22 12:31 ` Kumar Gala
2008-10-22 12:59 ` Régis Odeyé
2008-10-22 13:08 ` Kumar Gala
2008-10-22 13:40 ` Régis Odeyé
2008-10-22 13:42 ` Matt Sealey
2008-10-22 14:06 ` Kumar Gala
2008-10-22 14:19 ` Matt Sealey
2008-10-22 14:58 ` Kumar Gala
2008-10-22 18:11 ` Matt Sealey
2008-10-22 19:59 ` Becky Bruce
2008-10-22 22:18 ` Matt Sealey
2008-10-22 14:22 ` Matt Sealey
2008-10-22 14:59 ` Kumar Gala
2008-10-22 18:25 ` Matt Sealey
2008-10-22 14:18 ` Régis Odeyé [this message]
2008-10-22 22:11 ` Benjamin Herrenschmidt
2008-10-22 22:21 ` Matt Sealey
2008-10-22 22:48 ` Benjamin Herrenschmidt
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