diff options
Diffstat (limited to 'recipes/linux/linux-2.6.31/pcm043/0021-Early-printk.patch')
| -rw-r--r-- | recipes/linux/linux-2.6.31/pcm043/0021-Early-printk.patch | 106 |
1 files changed, 106 insertions, 0 deletions
diff --git a/recipes/linux/linux-2.6.31/pcm043/0021-Early-printk.patch b/recipes/linux/linux-2.6.31/pcm043/0021-Early-printk.patch new file mode 100644 index 0000000000..24f2264588 --- /dev/null +++ b/recipes/linux/linux-2.6.31/pcm043/0021-Early-printk.patch @@ -0,0 +1,106 @@ +From 286132d92272ffb0ae06ec3ecbe0cb3cfbd611c3 Mon Sep 17 00:00:00 2001 +From: Sascha Hauer <s.hauer@pengutronix.de> +Date: Thu, 29 Jan 2009 16:39:15 +0100 +Subject: [PATCH 021/101] Early printk + +Hi, + +Below is a patch which I have in my repository for some time now. It +adds an early console using the printch function. Unlike the printk +patch this one does not require patching the kernel and you do not get +duplicated kernel output lines. I don't know if this solution starts to +work at a later point than the printk patch, but it has proven useful in +several situations now. What do you think? + +Sascha + +commit 57242f4143c9ce48e3c49ddf3b206f780184991c +Author: Sascha Hauer <s.hauer@pengutronix.de> +Date: Thu Jan 29 16:32:30 2009 +0100 + + [ARM] Add an early debug console + + Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de> + +rebased to 2.6.31.6 +Signed-off-by: Jan Weitzel <J.Weitzel@phytec.de> +--- + arch/arm/Kconfig.debug | 8 ++++++++ + arch/arm/kernel/Makefile | 1 + + arch/arm/kernel/early_printk.c | 38 ++++++++++++++++++++++++++++++++++++++ + 3 files changed, 47 insertions(+), 0 deletions(-) + create mode 100644 arch/arm/kernel/early_printk.c + +Index: linux-2.6.31.6/arch/arm/Kconfig.debug +=================================================================== +--- linux-2.6.31.6.orig/arch/arm/Kconfig.debug 2009-12-07 15:58:21.683889680 +0100 ++++ linux-2.6.31.6/arch/arm/Kconfig.debug 2009-12-07 16:00:33.757198435 +0100 +@@ -70,6 +70,14 @@ + in the kernel. This is helpful if you are debugging code that + executes before the console is initialized. + ++config DEBUG_LL_CONSOLE ++ bool "Kernel early console" ++ depends on DEBUG_LL ++ help ++ Say Y here if you want to have an early console using the Kernel ++ low-level debugging functions. Add earlyprintk to your kernel ++ parameters to enable this console. ++ + config DEBUG_ICEDCC + bool "Kernel low-level debugging via EmbeddedICE DCC channel" + depends on DEBUG_LL +Index: linux-2.6.31.6/arch/arm/kernel/Makefile +=================================================================== +--- linux-2.6.31.6.orig/arch/arm/kernel/Makefile 2009-12-07 15:58:21.673849262 +0100 ++++ linux-2.6.31.6/arch/arm/kernel/Makefile 2009-12-07 16:00:33.757198435 +0100 +@@ -49,5 +49,6 @@ + + head-y := head$(MMUEXT).o + obj-$(CONFIG_DEBUG_LL) += debug.o ++obj-$(CONFIG_DEBUG_LL_CONSOLE) += early_printk.o + + extra-y := $(head-y) init_task.o vmlinux.lds +Index: linux-2.6.31.6/arch/arm/kernel/early_printk.c +=================================================================== +--- /dev/null 1970-01-01 00:00:00.000000000 +0000 ++++ linux-2.6.31.6/arch/arm/kernel/early_printk.c 2009-12-07 16:00:33.757198435 +0100 +@@ -0,0 +1,38 @@ ++/* ++ * linux/arch/arm/kernel/early_printk.c ++ * ++ * Copyright (C) 2009 Sascha Hauer <s.hauer@pengutronix.de> ++ * ++ * This program is free software; you can redistribute it and/or modify ++ * it under the terms of the GNU General Public License version 2 as ++ * published by the Free Software Foundation. ++ */ ++#include <linux/console.h> ++#include <linux/init.h> ++ ++extern void printch(int); ++ ++static void early_serial_write(struct console *con, const char *s, unsigned n) ++{ ++ while (*s && n-- > 0) { ++ if (*s == '\n') ++ printch('\r'); ++ printch(*s); ++ s++; ++ } ++} ++ ++static struct console early_serial_console = { ++ .name = "earlyser", ++ .write = early_serial_write, ++ .flags = CON_PRINTBUFFER | CON_BOOT, ++ .index = -1, ++}; ++ ++static int __init setup_early_printk(char *buf) ++{ ++ register_console(&early_serial_console); ++ return 0; ++} ++ ++early_param("earlyprintk", setup_early_printk); |