diff options
| author | Will Deacon <will.deacon@arm.com> | 2011-09-01 20:04:44 +0200 |
|---|---|---|
| committer | Russell King <rmk+kernel@arm.linux.org.uk> | 2011-10-17 10:03:03 +0200 |
| commit | 4f5ef9226afab7c9920f1e6c560f046f6aaba89c (patch) | |
| tree | ad8f15a9c1ecbad8a7a4e1127b18e2998cbec872 /arch | |
| parent | ARM: 7072/1: debug: use kconfig choice for selecting DEBUG_LL UART (diff) | |
| download | linux-4f5ef9226afab7c9920f1e6c560f046f6aaba89c.tar.xz linux-4f5ef9226afab7c9920f1e6c560f046f6aaba89c.zip | |
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')
| -rw-r--r-- | arch/arm/Kconfig.debug | 7 |
1 files changed, 6 insertions, 1 deletions
diff --git a/arch/arm/Kconfig.debug b/arch/arm/Kconfig.debug index 11604c9e55e0..60d184677955 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 |