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--- a/arch/mips/lantiq/Kconfig
+++ b/arch/mips/lantiq/Kconfig
@@ -33,4 +33,19 @@ endchoice
source "arch/mips/lantiq/falcon/Kconfig"
source "arch/mips/lantiq/xway/Kconfig"
+if EARLY_PRINTK
+choice
+ prompt "Early printk port"
+ default LANTIQ_PROM_ASC1
+ help
+ Choose which serial port is used, until the console driver is loaded
+
+config LANTIQ_PROM_ASC0
+ bool "ASC0"
+
+config LANTIQ_PROM_ASC1
+ bool "ASC1"
+endchoice
+endif
+
endif
--- /dev/null
+++ b/arch/mips/lantiq/early_printk.c
@@ -0,0 +1,68 @@
+/*
+ * 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.
+ *
+ * Copyright (C) 2010 John Crispin <blogic@openwrt.org>
+ */
+
+#include <linux/init.h>
+#include <linux/cpu.h>
+
+#include <lantiq.h>
+
+#ifdef CONFIG_SOC_LANTIQ_XWAY
+#include <xway.h>
+#ifdef CONFIG_LANTIQ_PROM_ASC0
+#define LQ_ASC_BASE KSEG1ADDR(LQ_ASC0_BASE)
+#else
+#define LQ_ASC_BASE KSEG1ADDR(LQ_ASC1_BASE)
+#endif
+
+#elif CONFIG_SOC_LANTIQ_FALCON
+#include <falcon/gpon_reg_base.h>
+#ifdef CONFIG_LANTIQ_PROM_ASC0
+#define LQ_ASC_BASE GPON_ASC0_BASE
+#else
+#define LQ_ASC_BASE GPON_ASC1_BASE
+#endif
+
+#endif
+
+#define ASC_BUF 1024
+#define LQ_ASC_FSTAT 0x0048
+#define LQ_ASC_TBUF 0x0020
+#define TXMASK 0x3F00
+#define TXOFFSET 8
+
+static char buf[ASC_BUF];
+
+void
+prom_putchar(char c)
+{
+ unsigned long flags;
+
+ local_irq_save(flags);
+ while ((lq_r32((u32 *)(LQ_ASC_BASE + LQ_ASC_FSTAT)) & TXMASK) >> TXOFFSET);
+
+ if (c == '\n')
+ lq_w32('\r', (u32 *)(LQ_ASC_BASE + LQ_ASC_TBUF));
+ lq_w32(c, (u32 *)(LQ_ASC_BASE + LQ_ASC_TBUF));
+ local_irq_restore(flags);
+}
+
+void
+early_printf(const char *fmt, ...)
+{
+ va_list args;
+ int l;
+ char *p, *buf_end;
+
+ va_start(args, fmt);
+ l = vsnprintf(buf, ASC_BUF, fmt, args);
+ va_end(args);
+ buf_end = buf + l;
+
+ for (p = buf; p < buf_end; p++)
+ prom_putchar(*p);
+}
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