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 17:13:43 +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]:42732 "EHLO ciao.gmane.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752070AbZBRQOF (ORCPT ); Wed, 18 Feb 2009 11:14:05 -0500 Received: from list by ciao.gmane.org with local (Exim 4.43) id 1LZp3c-0000JB-5n for linux-rt-users@vger.kernel.org; Wed, 18 Feb 2009 16:13:56 +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 16:13:56 +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 16:13:56 +0000 In-Reply-To: Sender: linux-rt-users-owner@vger.kernel.org List-ID: Hi again, I adapted the kernel to allow a four-level CAM mapping. If the memory is reduced to 448M (i.e. result is CAM0=256Mb, CAM1=64Mb, CAM2=64Mb CAM3=64Mb residual: 0Mb) there will be no highmem assigned by the kernel at all. In that case the U-Boot boot loader is set to initrd_high=0x1C000000, i.e. it will put the initrd right at the "upper end" of available memory. linux-rt doesn't fail to mount the initrd. I tend to believe that the issue is related to the use of highmem in linux-rt (OK, pretty vague:). Florian