From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail.kontron-modular.com (mail.kontron-modular.com [213.179.130.140]) by ozlabs.org (Postfix) with ESMTP id DB8D0DDE0D for ; Thu, 23 Oct 2008 01:19:17 +1100 (EST) Message-ID: <48FF364E.9070701@kontron.com> Date: Wed, 22 Oct 2008 16:18:54 +0200 From: =?ISO-8859-1?Q?R=E9gis_Odey=E9?= MIME-Version: 1.0 To: Matt Sealey Subject: Re: Extended Addressing Mode References: <48FEEB88.6050505@kontron.com> <83735324-C37B-4C57-A50F-FFF0D133E4E3@kernel.crashing.org> <48FF23C4.5030408@kontron.com> <88C8EDEB-C9A5-4876-AF7D-55CBABBE111D@kernel.crashing.org> <48FF2DDE.9060301@genesi-usa.com> In-Reply-To: <48FF2DDE.9060301@genesi-usa.com> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Cc: linuxppc-dev@ozlabs.org List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , 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