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| author | Nicolas Pitre <nicolas.pitre@linaro.org> | 2012-02-22 21:58:03 +0100 |
|---|---|---|
| committer | Russell King <rmk+kernel@arm.linux.org.uk> | 2012-03-24 10:38:55 +0100 |
| commit | 9b5a146a43db3733c731d47022f4f5259e6b31e6 (patch) | |
| tree | 3fc6d02c65c3f373d6408f9c332de183be7230b0 /arch/arm/Kconfig.debug | |
| parent | ARM: use set_current_blocked() and block_sigmask() (diff) | |
| download | linux-9b5a146a43db3733c731d47022f4f5259e6b31e6.tar.xz linux-9b5a146a43db3733c731d47022f4f5259e6b31e6.zip | |
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.debug | 16 |
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 |