/* * linux/arch/unicore32/kernel/early_printk.c * * Code specific to PKUnity SoC and UniCore ISA * * Copyright (C) 2001-2010 GUAN Xue-tao * * 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> #include <linux/string.h> #include <mach/ocd.h> /* On-Chip-Debugger functions */ static void early_ocd_write(struct console *con, const char *s, unsigned n) { while (*s && n-- > 0) { if (*s == '\n') ocd_putc((int)'\r'); ocd_putc((int)*s); s++; } } static struct console early_ocd_console = { .name = "earlyocd", .write = early_ocd_write, .flags = CON_PRINTBUFFER, .index = -1, }; static int __init setup_early_printk(char *buf) { if (!buf || early_console) return 0; early_console = &early_ocd_console; if (strstr(buf, "keep")) early_console->flags &= ~CON_BOOT; else early_console->flags |= CON_BOOT; register_console(early_console); return 0; } early_param("earlyprintk", setup_early_printk);