837ec2d56c
Allow hardware errors to be caught during early portions of booting, and leave something in the shadow console that people can use to debug their system with (to be printed out by the bootloader on next reset). This enables the hardare error interrupts in head.S, allowing us to find hardware errors when they happen (well, as much as you can with a hardware error) and prints out the trace if it is enabled. This will catch errors (like booting the wrong image on a 533) which previously resulted in a infinite loop/hang, as well as random hardware errors before before setup_arch(). To disable this debug only feature - turn off EARLY_PRINTK. Signed-off-by: Robin Getz <robin.getz@analog.com> Signed-off-by: Mike Frysinger <vapier@gentoo.org>
52 lines
1.8 KiB
C
52 lines
1.8 KiB
C
/*
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* File: include/asm-blackfin/early_printk.h
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* Author: Robin Getz <rgetz@blackfin.uclinux.org
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*
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* Created: 14Aug2007
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* Description: function prototpyes for early printk
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*
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* Modified:
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* Copyright 2004-2007 Analog Devices Inc.
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*
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* Bugs: Enter bugs at http://blackfin.uclinux.org/
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#ifndef __ASM_EARLY_PRINTK_H__
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#define __ASM_EARLY_PRINTK_H__
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#ifdef CONFIG_EARLY_PRINTK
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/* For those that don't include it already */
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#include <linux/console.h>
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extern int setup_early_printk(char *);
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extern void enable_shadow_console(void);
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extern int shadow_console_enabled(void);
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extern void mark_shadow_error(void);
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extern void early_shadow_reg(unsigned long reg, unsigned int n);
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extern void early_shadow_write(struct console *con, const char *s,
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unsigned int n) __attribute__((nonnull(2)));
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#define early_shadow_puts(str) early_shadow_write(NULL, str, strlen(str))
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#define early_shadow_stamp() \
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do { \
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early_shadow_puts(__FILE__ " : " __stringify(__LINE__) " ["); \
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early_shadow_puts(__func__); \
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early_shadow_puts("]\n"); \
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} while (0)
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#else
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#define setup_early_printk(fmt) do { } while (0)
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#define enable_shadow_console(fmt) do { } while (0)
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#define early_shadow_stamp() do { } while (0)
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#endif /* CONFIG_EARLY_PRINTK */
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#endif /* __ASM_EARLY_PRINTK_H__ */
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