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authorNicolas Pitre <nicolas.pitre@linaro.org>2012-02-22 21:58:03 +0100
committerRussell King <rmk+kernel@arm.linux.org.uk>2012-03-24 09:38:55 +0000
commit9b5a146a43db3733c731d47022f4f5259e6b31e6 (patch)
tree3fc6d02c65c3f373d6408f9c332de183be7230b0 /arch/arm/Kconfig.debug
parent101d9b0dedbc9e560737d3357104bf09db48eb3e (diff)
downloadlinux-9b5a146a43db3733c731d47022f4f5259e6b31e6.tar.bz2
ARM: 7338/1: add support for early console output via semihosting
This is a very simple method for code running in an emulator, or under the supervision of a debugger, to use I/O facilities on the controlling host. Tested with OpenOCD, and ARM's Fast Models. Details on semihosting can be found in chapter 8 of DUI0203I_rvct_developer_guide.pdf from ARM Ltd. Signed-off-by: Nicolas Pitre <nicolas.pitre@linaro.org> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Diffstat (limited to 'arch/arm/Kconfig.debug')
-rw-r--r--arch/arm/Kconfig.debug16
1 files changed, 16 insertions, 0 deletions
diff --git a/arch/arm/Kconfig.debug b/arch/arm/Kconfig.debug
index e0d236d7ff73..755d9fbe3238 100644
--- a/arch/arm/Kconfig.debug
+++ b/arch/arm/Kconfig.debug
@@ -100,6 +100,22 @@ choice
Note that the system will appear to hang during boot if there
is nothing connected to read from the DCC.
+ config DEBUG_SEMIHOSTING
+ bool "Kernel low-level debug output via semihosting I"
+ help
+ Semihosting enables code running on an ARM target to use
+ the I/O facilities on a host debugger/emulator through a
+ simple SVC calls. The host debugger or emulator must have
+ semihosting enabled for the special svc call to be trapped
+ otherwise the kernel will crash.
+
+ This is known to work with OpenOCD, as wellas
+ ARM's Fast Models, or any other controlling environment
+ that implements semihosting.
+
+ For more details about semihosting, please see
+ chapter 8 of DUI0203I_rvct_developer_guide.pdf from ARM Ltd.
+
config AT91_DEBUG_LL_DBGU0
bool "Kernel low-level debugging on rm9200, 9260/9g20, 9261/9g10 and 9rl"
depends on HAVE_AT91_DBGU0