From patchwork Sun Jun 9 16:47:45 2013 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Pavel Machek X-Patchwork-Id: 2694491 Return-Path: X-Original-To: patchwork-linux-omap@patchwork.kernel.org Delivered-To: patchwork-process-083081@patchwork2.kernel.org Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by patchwork2.kernel.org (Postfix) with ESMTP id A9D54DF2A1 for ; Sun, 9 Jun 2013 16:48:12 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751023Ab3FIQrv (ORCPT ); Sun, 9 Jun 2013 12:47:51 -0400 Received: from atrey.karlin.mff.cuni.cz ([195.113.26.193]:34450 "EHLO atrey.karlin.mff.cuni.cz" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750822Ab3FIQrv (ORCPT ); Sun, 9 Jun 2013 12:47:51 -0400 Received: by atrey.karlin.mff.cuni.cz (Postfix, from userid 512) id E025B816BD; Sun, 9 Jun 2013 18:47:49 +0200 (CEST) Date: Sun, 9 Jun 2013 18:47:45 +0200 From: Pavel Machek To: Pali =?iso-8859-1?Q?Roh=E1r?= Cc: kernel list , linux-arm-kernel , aaro.koskinen@iki.fi, linux-omap@vger.kernel.org, lauri.leukkunen@nokia.com Subject: Re: N900 device tree conversion: how to do first step Message-ID: <20130609164745.GB16066@amd.pavel.ucw.cz> References: <20130609015944.GA23559@amd.pavel.ucw.cz> <201306091124.41251@pali> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <201306091124.41251@pali> User-Agent: Mutt/1.5.20 (2009-06-14) Sender: linux-omap-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-omap@vger.kernel.org On Sun 2013-06-09 11:24:40, Pali Rohár wrote: > On Sunday 09 June 2013 03:59:44 Pavel Machek wrote: > > Hi! > > > > I'd like to convert Nokia N900 to device tree. > > > > Unfortunately, serial port is not easily available (very > > special cable would be needed, does someone know where to get > > one?) and I don't have BDI (and very special cable would be > > needed, too). > > > > Hello, > > I used serial port only in qemu for debugging. Maybe you can try > to play with qemu first. Qemu has good n900 HW support. Yes, qemu is helpful. For the record: this is how you use it. KERNEL=/data/l/linux-n900/zImage_dtb ./qflasher -m rx51 -x ./xloader-qemu.bin -s ./secondary-qemu.bin -k $KERNEL -o n900.img -p k=6072 > sd-empty ./qemu-system-arm -s -M n900 -mtdblock n900.img -sd sd-empty -serial stdio -clock unix -redir tcp:5555:10.0.2.15:22 ...and this patch is needed to make it past rx51_init. Author: Pavel Date: Sun Jun 9 18:45:39 2013 +0200 Comment out errata workaround that breaks qemu. diff --git a/arch/arm/mach-omap2/board-rx51.c b/arch/arm/mach-omap2/board-rx51.c index 938e46f..0ffd7d3 100644 --- a/arch/arm/mach-omap2/board-rx51.c +++ b/arch/arm/mach-omap2/board-rx51.c @@ -108,11 +108,13 @@ static void __init rx51_init(void) rx51_peripherals_init(); rx51_camera_init(); +#if 0 #ifdef CONFIG_ARM_ERRATA_430973 printk(KERN_INFO "RX-51: Enabling ARM errata 430973 workaround.\n"); /* set IBE to 1 */ rx51_secure_update_aux_cr(1 << 6, 0); #endif +#endif /* Ensure SDRC pins are mux'd for self-refresh */ omap_mux_init_signal("sdrc_cke0", OMAP_PIN_OUTPUT);