From: Matt Sealey <matt@genesi-usa•com>
To: Kumar Gala <galak@kernel•crashing.org>
Cc: linuxppc-dev@ozlabs•org, "Régis Odeyé" <regis.odeye@kontron•com>
Subject: Re: Extended Addressing Mode
Date: Wed, 22 Oct 2008 09:22:59 -0500 [thread overview]
Message-ID: <48FF3743.1000007@genesi-usa.com> (raw)
In-Reply-To: <DC24FCF5-F410-47AB-8FC0-592EA0906568@kernel.crashing.org>
Kumar Gala wrote:
>
>
> Your bigger issue is if you can setup the DDR controller for the hole
> you want.
I just remembered;;
~~
The CCSR window always takes precedence over all local access
windows. However, the CCSR window must not overlap an LAW that
maps to the DDR controller. Otherwise, undefined behavior occurs.
~~
So, it's not really possible to map 4GB of RAM in the lower
32-bit area, without interacting badly with the CCSR. This
means you're forced to select a 2GB LAW for DDR, then leave
2GB free, then map the rest above.. using more than 2Gb
therefore absolutely requires non-contiguous memory..?
--
Matt Sealey <matt@genesi-usa•com>
Genesi, Manager, Developer Relations
next prev parent reply other threads:[~2008-10-22 14:23 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 [this message]
2008-10-22 14:59 ` Kumar Gala
2008-10-22 18:25 ` Matt Sealey
2008-10-22 14:18 ` Régis Odeyé
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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