From mboxrd@z Thu Jan 1 00:00:00 1970 From: Florian Boelstler Subject: Re: 2.6.26.8-rt16 powerpc and mem=... Date: Wed, 18 Feb 2009 12:48:39 +0100 Message-ID: References: Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-15; format=flowed Content-Transfer-Encoding: 7bit To: linux-rt-users@vger.kernel.org Return-path: Received: from main.gmane.org ([80.91.229.2]:35990 "EHLO ciao.gmane.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750851AbZBRLs4 (ORCPT ); Wed, 18 Feb 2009 06:48:56 -0500 Received: from list by ciao.gmane.org with local (Exim 4.43) id 1LZkv7-00065S-8C for linux-rt-users@vger.kernel.org; Wed, 18 Feb 2009 11:48:53 +0000 Received: from fw-emea.rohde-schwarz.com ([80.246.32.33]) by main.gmane.org with esmtp (Gmexim 0.1 (Debian)) id 1AlnuQ-0007hv-00 for ; Wed, 18 Feb 2009 11:48:53 +0000 Received: from euphoria by fw-emea.rohde-schwarz.com with local (Gmexim 0.1 (Debian)) id 1AlnuQ-0007hv-00 for ; Wed, 18 Feb 2009 11:48:53 +0000 In-Reply-To: Sender: linux-rt-users-owner@vger.kernel.org List-ID: Hi, I did some further tests in the meanwhile. If the memory is reduced to 256M with mem=256M Linux does not make use of highmem, since memory can be completely mapped using a single CAM entry. (Kernel output: Memory CAM mapping: CAM0=256Mb, CAM1=0Mb, CAM2=0Mb residual: 0Mb) In that case the initrd is successfully mounted at all times up to now. When I was starting to play with mem=... on vanilla kernels I was told [1] that it should be trivial to allow more than three levels of CAM mappings. May be this is an intermediate solution. Florian [1] http://ozlabs.org/pipermail/linuxppc-embedded/2008-June/030638.html