[PATCH] MIPS: IP22/IP28 Disable EARLY_PRINTK on make the system boot

[PATCH] MIPS: IP22/IP28 Disable EARLY_PRINTK on make the system boot

[Ralf Baechle]

From: Martin Michlmayr <tbm@cyrius.com>

Some Debian users have reported that the kernel hangs early during boot on
some IP22 systems.  Thomas Bogendoerfer found that this is due to a "bad
interaction between CONFIG_EARLY_PRINTK and overwritten prom memory during
early boot".  Since there's no fix yet, disable CONFIG_EARLY_PRINTK for now.

Signed-off-by: Martin Michlmayr <tbm@cyrius.com>
Cc: Martin Michlmayr <tbm@cyrius.com>
Cc: linux-mips@linux-mips.org
Cc: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
Cc: Dmitri Vorobiev <dmitri.vorobiev@gmail.com>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
---
This version also disables early printk for IP28.

diff --git a/arch/mips/Kconfig b/arch/mips/Kconfig
index 1aad0d9..ffdd651 100644
--- a/arch/mips/Kconfig
+++ b/arch/mips/Kconfig
@@ -358,7 +358,14 @@ config SGI_IP22
 	select SWAP_IO_SPACE
 	select SYS_HAS_CPU_R4X00
 	select SYS_HAS_CPU_R5000
-	select SYS_HAS_EARLY_PRINTK
+	#
+	# Disable EARLY_PRINTK for now since it leads to overwritten prom
+	# memory during early boot on some machines.
+	#
+	# See http://www.linux-mips.org/cgi-bin/mesg.cgi?a=linux-mips&i=20091119164009.GA15038%40deprecation.cyrius.com
+	# for a more details discussion
+	#
+	# select SYS_HAS_EARLY_PRINTK
 	select SYS_SUPPORTS_32BIT_KERNEL
 	select SYS_SUPPORTS_64BIT_KERNEL
 	select SYS_SUPPORTS_BIG_ENDIAN
@@ -410,7 +417,14 @@ config SGI_IP28
 	select SGI_HAS_ZILOG
 	select SWAP_IO_SPACE
 	select SYS_HAS_CPU_R10000
-	select SYS_HAS_EARLY_PRINTK
+	#
+	# Disable EARLY_PRINTK for now since it leads to overwritten prom
+	# memory during early boot on some machines.
+	#
+	# See http://www.linux-mips.org/cgi-bin/mesg.cgi?a=linux-mips&i=20091119164009.GA15038%40deprecation.cyrius.com
+	# for a more details discussion
+	#
+	# select SYS_HAS_EARLY_PRINTK
 	select SYS_SUPPORTS_64BIT_KERNEL
 	select SYS_SUPPORTS_BIG_ENDIAN
       help