diff options
author | Will Deacon <will.deacon@arm.com> | 2011-09-01 14:04:44 -0400 |
---|---|---|
committer | Russell King <rmk+kernel@arm.linux.org.uk> | 2011-10-17 04:03:03 -0400 |
commit | 4f5ef9226afab7c9920f1e6c560f046f6aaba89c (patch) | |
tree | ad8f15a9c1ecbad8a7a4e1127b18e2998cbec872 | |
parent | 17916b284e6afea210484e4c2688debb8c9641c2 (diff) |
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>
-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 | |||
65 | 65 | ||
66 | # These options are only for real kernel hackers who want to get their hands dirty. | 66 | # These options are only for real kernel hackers who want to get their hands dirty. |
67 | config DEBUG_LL | 67 | config DEBUG_LL |
68 | bool "Kernel low-level debugging functions" | 68 | bool "Kernel low-level debugging functions (read help!)" |
69 | depends on DEBUG_KERNEL | 69 | depends on DEBUG_KERNEL |
70 | help | 70 | help |
71 | Say Y here to include definitions of printascii, printch, printhex | 71 | Say Y here to include definitions of printascii, printch, printhex |
72 | in the kernel. This is helpful if you are debugging code that | 72 | in the kernel. This is helpful if you are debugging code that |
73 | executes before the console is initialized. | 73 | executes before the console is initialized. |
74 | 74 | ||
75 | Note that selecting this option will limit the kernel to a single | ||
76 | UART definition, as specified below. Attempting to boot the kernel | ||
77 | image on a different platform *will not work*, so this option should | ||
78 | not be enabled for kernels that are intended to be portable. | ||
79 | |||
75 | choice | 80 | choice |
76 | prompt "Kernel low-level debugging port" | 81 | prompt "Kernel low-level debugging port" |
77 | depends on DEBUG_LL | 82 | depends on DEBUG_LL |