Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751143AbVJBS5c (ORCPT ); Sun, 2 Oct 2005 14:57:32 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1751150AbVJBS5c (ORCPT ); Sun, 2 Oct 2005 14:57:32 -0400 Received: from zproxy.gmail.com ([64.233.162.203]:44869 "EHLO zproxy.gmail.com") by vger.kernel.org with ESMTP id S1751143AbVJBS5c convert rfc822-to-8bit (ORCPT ); Sun, 2 Oct 2005 14:57:32 -0400 DomainKey-Signature: a=rsa-sha1; q=dns; c=nofws; s=beta; d=gmail.com; h=received:message-id:date:from:reply-to:to:subject:in-reply-to:mime-version:content-type:content-transfer-encoding:content-disposition:references; b=HOo8lkQwv10fkpVDGuuP+j0cYInBrb3qNay+TAK8FEUFSK7WSQ4sOuC1WMA/gY5EMQlwIuGLRq5WJmjc5WOmIwM39kAlrUfQLlP/BeElvosxVrwYrnPTBnvOIPucR8zKoVaJ29Kd5ZMQ6QoC00Dfg5SN6/bPGqULk6FHGc1ff4c= Message-ID: <35fb2e590510021157l63f6a270l2810659427a8fa9e@mail.gmail.com> Date: Sun, 2 Oct 2005 19:57:30 +0100 From: Jon Masters Reply-To: jonathan@jonmasters.org To: Linux Kernel Mailing List Subject: Re: Discontiguous memory fun In-Reply-To: <35fb2e5905090110171aa77266@mail.gmail.com> MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7BIT Content-Disposition: inline References: <35fb2e5905090110171aa77266@mail.gmail.com> Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1074 Lines: 26 Replying to my own post... On 9/1/05, Jon Masters wrote: > I've got a hardware platform based on an ARM922, a bit like Excalibur, > which has a nice large hole in memory: > > 0x0000_0000 - 32MB (or whatever) of SDRAM. > 0x8000_0000 - 64MB (or whatever) of SDRAM. I fixed it using a bodge similar to PHYS_OFFSET and disabled the lower bank of memory if the kernel was booted at the higher address since it was extremely difficult to play with the half-support for discontig in old 2.4 ARM kernels (all of the existing boards are just playing a game of luck with their memory/node mappings) without a working BDI. I'd love to know what the state of discontig memory is like on 2.6 series ARM kernels and highmem too for that matter, but I've not had chance to look at it (I'm usually a ppc guy). Jon. - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/