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authorWill Deacon <will.deacon@arm.com>2011-09-01 19:04:44 +0100
committerRussell King <rmk+kernel@arm.linux.org.uk>2011-10-17 09:03:03 +0100
commit4f5ef9226afab7c9920f1e6c560f046f6aaba89c (patch)
treead8f15a9c1ecbad8a7a4e1127b18e2998cbec872 /arch/arm/Kconfig.debug
parent17916b284e6afea210484e4c2688debb8c9641c2 (diff)
downloadop-kernel-dev-4f5ef9226afab7c9920f1e6c560f046f6aaba89c.zip
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ARM: 7073/1: debug: augment DEBUG_LL Kconfig help to clarify behaviour
Enabled DEBUG_LL hardcodes the UART address into the kernel and results in a non-portable kernel image. Since this option is only intended for use when debugging early boot failures, supporting multiple platforms in such a configuration is not the intended use-case. This patch documents this limitation in the DEBUG_LL Kconfig help text, so that users are aware of the portability restrictions that are associated with enabling low-level debugging support. Reported-by: Sascha Hauer <s.hauer@pengutronix.de> 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/Kconfig.debug')
-rw-r--r--arch/arm/Kconfig.debug7
1 files changed, 6 insertions, 1 deletions
diff --git a/arch/arm/Kconfig.debug b/arch/arm/Kconfig.debug
index 11604c9..60d1846 100644
--- a/arch/arm/Kconfig.debug
+++ b/arch/arm/Kconfig.debug
@@ -65,13 +65,18 @@ config DEBUG_USER
# These options are only for real kernel hackers who want to get their hands dirty.
config DEBUG_LL
- bool "Kernel low-level debugging functions"
+ bool "Kernel low-level debugging functions (read help!)"
depends on DEBUG_KERNEL
help
Say Y here to include definitions of printascii, printch, printhex
in the kernel. This is helpful if you are debugging code that
executes before the console is initialized.
+ Note that selecting this option will limit the kernel to a single
+ UART definition, as specified below. Attempting to boot the kernel
+ image on a different platform *will not work*, so this option should
+ not be enabled for kernels that are intended to be portable.
+
choice
prompt "Kernel low-level debugging port"
depends on DEBUG_LL
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