Hi Graeme,
On Wed, Sep 21, 2011 at 4:18 PM, Simon Glass sjg@chromium.org wrote:
Hi Graeme,
On Thu, Sep 1, 2011 at 3:52 AM, Graeme Russ graeme.russ@gmail.com wrote:
Allow redirection of console output prior to console initialisation to a temporary buffer.
To enable this functionality, the board (or arch) must define:
- CONFIG_PRE_CONSOLE_BUFFER - Enable pre-console buffer
- CONFIG_PRE_CON_BUF_ADDR - Base address of pre-console buffer
- CONFIG_PRE_CON_BUF_SZ - Size of pre-console buffer (in bytes)
The pre-console buffer will buffer the last CONFIG_PRE_CON_BUF_SZ bytes Any earlier characters are silently dropped.
Signed-off-by: Graeme Russ graeme.russ@gmail.com
I tested this on a Tegra2 Seaboard.
Tested-by: Simon Glass sjg@chromium.org
Further to this, I pushed it a little further and managed to get early console output from the AVP (an ARM7) before the Cortex-A9s are fired up on a Tegra20/30. That's pretty early!
This is a great patch and very useful for early bring-up I think. I hope it will be merged this window. Any other comments?
Regards, Simon
Regards, Simon
Grrrr - Repost of V5 with an SoB. There has to be a better way of automating patch updates ;)
Changes since V4
- Fixed typo in README
- Made *pre_console* functions in console.c static
- Slight tweak to commit message - Some may choose to set the
configuration defines at the arch level
Changes since V3
- Fixed blank subject caused by gap between the Cc: list and Date:
Changes since V2
- Cast buffer size to unsigned long to help compilers produce tighter
code
- Use inline stub functions to reduce #ifdef clutter
- Add documentation to README
Changes Since V1
- Implemented circular buffer
- Trivial code styl corrections
README | 14 +++++++++ arch/arm/include/asm/global_data.h | 3 ++ arch/avr32/include/asm/global_data.h | 3 ++ arch/blackfin/include/asm/global_data.h | 3 ++ arch/m68k/include/asm/global_data.h | 3 ++ arch/microblaze/include/asm/global_data.h | 3 ++ arch/mips/include/asm/global_data.h | 3 ++ arch/nios2/include/asm/global_data.h | 3 ++ arch/powerpc/include/asm/global_data.h | 3 ++ arch/sh/include/asm/global_data.h | 3 ++ arch/sparc/include/asm/global_data.h | 3 ++ arch/x86/include/asm/global_data.h | 3 ++ common/console.c | 43
+++++++++++++++++++++++++++-
13 files changed, 88 insertions(+), 2 deletions(-)
diff --git a/README b/README index 0886987..cf6c01f 100644
[snip]