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authorWill Deacon <will.deacon@arm.com>2011-09-01 18:58:51 +0100
committerRussell King <rmk+kernel@arm.linux.org.uk>2011-10-17 09:03:03 +0100
commit17916b284e6afea210484e4c2688debb8c9641c2 (patch)
tree87a508ef18008e96239b2208bf00d9d41beec1f2 /arch/arm
parentd0a77454c70d0449a5f87087deb8f0cb15145e90 (diff)
ARM: 7072/1: debug: use kconfig choice for selecting DEBUG_LL UART
Enabling CONFIG_DEBUG_LL (which is required for earlyprintk) hardwires the debug UART address into the kernel, so that we can print before the platform is initialised. If the user inadvertently selects multiple platforms with DEBUG_LL enabled, the UART address may not be correct and will likely cause the kernel to hang in the very early stages of boot. This patch, based on a skeleton from Russell, uses a Kconfig choice for selecting the DEBUG_LL UART, therefore allowing the user to make a choice about the supported platform when DEBUG_LL is enabled. Acked-by: Nicolas Pitre <nicolas.pitre@linaro.org> Signed-off-by: Will Deacon <will.deacon@arm.com> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Diffstat (limited to 'arch/arm')
-rw-r--r--arch/arm/Kconfig.debug41
1 files changed, 24 insertions, 17 deletions
diff --git a/arch/arm/Kconfig.debug b/arch/arm/Kconfig.debug
index 81cbe40c159..11604c9e55e 100644
--- a/arch/arm/Kconfig.debug
+++ b/arch/arm/Kconfig.debug
@@ -72,6 +72,30 @@ config DEBUG_LL
in the kernel. This is helpful if you are debugging code that
executes before the console is initialized.
+choice
+ prompt "Kernel low-level debugging port"
+ depends on DEBUG_LL
+
+ config DEBUG_DC21285_PORT
+ bool "Kernel low-level debugging messages via footbridge serial port"
+ depends on FOOTBRIDGE
+ help
+ Say Y here if you want the debug print routines to direct
+ their output to the serial port in the DC21285 (Footbridge).
+ Saying N will cause the debug messages to appear on the first
+ 16550 serial port.
+
+ config DEBUG_CLPS711X_UART2
+ bool "Kernel low-level debugging messages via UART2"
+ depends on ARCH_CLPS711X
+ help
+ Say Y here if you want the debug print routines to direct
+ their output to the second serial port on these devices.
+ Saying N will cause the debug messages to appear on the first
+ serial port.
+
+endchoice
+
config EARLY_PRINTK
bool "Early printk"
depends on DEBUG_LL
@@ -100,23 +124,6 @@ config OC_ETM
buffer driver that will allow you to collect traces of the
kernel code.
-config DEBUG_DC21285_PORT
- bool "Kernel low-level debugging messages via footbridge serial port"
- depends on DEBUG_LL && FOOTBRIDGE
- help
- Say Y here if you want the debug print routines to direct their
- output to the serial port in the DC21285 (Footbridge). Saying N
- will cause the debug messages to appear on the first 16550
- serial port.
-
-config DEBUG_CLPS711X_UART2
- bool "Kernel low-level debugging messages via UART2"
- depends on DEBUG_LL && ARCH_CLPS711X
- help
- Say Y here if you want the debug print routines to direct their
- output to the second serial port on these devices. Saying N will
- cause the debug messages to appear on the first serial port.
-
config DEBUG_S3C_UART
depends on PLAT_SAMSUNG
int "S3C UART to use for low-level debug"