From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail.innovsys.com (smtp.innovsys.com [66.115.232.196]) by ozlabs.org (Postfix) with ESMTP id 2A21DDF6BB for ; Thu, 22 May 2008 07:01:24 +1000 (EST) MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Subject: RE: 1 GB lowmem Date: Wed, 21 May 2008 15:55:59 -0500 Message-ID: In-Reply-To: References: From: "Rune Torgersen" To: List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Rune Torgersen wrote: > linuxppc-dev-bounces+runet=3Dinnovsys.com@ozlabs.org wrote: >> Hi >>=20 >> I am trying to enable 1 GB of lowmem on a Freescale 8280. >> In arch/ppc this was easilly done by: >> CONFIG_ADVANCED_OPTIONS=3Dy >> CONFIG_HIGHMEM_START=3D0xfe000000 >> CONFIG_LOWMEM_SIZE_BOOL=3Dy >> CONFIG_LOWMEM_SIZE=3D0x40000000 >> CONFIG_KERNEL_START_BOOL=3Dy >> CONFIG_KERNEL_START=3D0xa0000000 >>=20 >> This does not work in arch/powerpc. CPU hangs as soon as init starts. >> Any ideas what to look at, what to change? >>=20 >> The reason I want to do this is because I cannot get highmem support >> to work when using CONFIG_PREEMPT_RT. >> (hitting a bug_on in kmap_atomic) >=20 > Scratch that. 1 GB lowmem works with vanilla 2.6.25.4, but > not at all with 2.6.25.4-rt[13] Argh... Found it. Had to set CONFIG_TASK_SIZE to 0x80000000. Now it works in both vaniulla an d RT kernel. Highmem still doesn't work.