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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 09:38:55 +0000 |
| commit | 9b5a146a43db3733c731d47022f4f5259e6b31e6 (patch) | |
| tree | 3fc6d02c65c3f373d6408f9c332de183be7230b0 /arch/arm/kernel/head.S | |
| parent | 101d9b0dedbc9e560737d3357104bf09db48eb3e (diff) | |
| download | linux-9b5a146a43db3733c731d47022f4f5259e6b31e6.tar.gz linux-9b5a146a43db3733c731d47022f4f5259e6b31e6.tar.bz2 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/kernel/head.S')
| -rw-r--r-- | arch/arm/kernel/head.S | 8 |
1 files changed, 4 insertions, 4 deletions
diff --git a/arch/arm/kernel/head.S b/arch/arm/kernel/head.S index a2e9694a68ee..3bf0c7f8b043 100644 --- a/arch/arm/kernel/head.S +++ b/arch/arm/kernel/head.S @@ -265,7 +265,7 @@ __create_page_tables: str r6, [r3] #ifdef CONFIG_DEBUG_LL -#ifndef CONFIG_DEBUG_ICEDCC +#if !defined(CONFIG_DEBUG_ICEDCC) && !defined(CONFIG_DEBUG_SEMIHOSTING) /* * Map in IO space for serial debugging. * This allows debug messages to be output @@ -297,10 +297,10 @@ __create_page_tables: cmp r0, r6 blo 1b -#else /* CONFIG_DEBUG_ICEDCC */ - /* we don't need any serial debugging mappings for ICEDCC */ +#else /* CONFIG_DEBUG_ICEDCC || CONFIG_DEBUG_SEMIHOSTING */ + /* we don't need any serial debugging mappings */ ldr r7, [r10, #PROCINFO_IO_MMUFLAGS] @ io_mmuflags -#endif /* !CONFIG_DEBUG_ICEDCC */ +#endif #if defined(CONFIG_ARCH_NETWINDER) || defined(CONFIG_ARCH_CATS) /* |