Hi Graeme,
On Wed, Aug 31, 2011 at 5:58 AM, Graeme Russ <graeme.r...@gmail.com> wrote:
> Allow redirection of console output prior to console initialisation to a
> temporary buffer.
>
> To enable this functionality, the board configuration file 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.r...@gmail.com>
> ---
> 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..170e67b 100644
> --- a/README
> +++ b/README
> @@ -619,6 +619,20 @@ The following options need to be configured:
> must be defined, to setup the maximum idle timeout for
> the SMC.
>
> +- Pre-Console Buffer:
> + Prior to the console being initialised (i.e. serial UART
> + initialised etc) all console output is silently discarded.
> + Defining CONFIG_PRE_CONSOLE_BUFFER will cause U-Boot to
> + buffer any console messages prior to the console being
> + initialised to a buffer of size CONFIG_PRE_CON_BUF_SZ
> + bytes located at CONFIG_PRE_CON_BUF_ADDR. The buffer is
> + a cicular buffer, so if more than CONFIG_PRE_CON_BUF_SZ
nit: circular. Just a suggestion if you like: you could also offer
guidance for the location of the buffer, something like:
You can place the buffer at the top of memory by adding something like
this in your board config file:
#define CONFIG_PRE_CON_BUF_ADDR (CONFIG_SYS_INIT_RAM_ADDR + \
CONFIG_SYS_INIT_RAM_SIZE - \
CONFIG_PRE_CON_BUF_SZ)
#define CONFIG_SYS_INIT_SP_ADDR (CONFIG_PRE_CON_BUF_ADDR - \
GENERATED_GBL_DATA_SIZE)
> + bytes are output before the console is initialised, the
> + earlier bytes are discarded.
> +
Anyway:
Acked-by: Simon Glass <s...@chromium.org>
Regards,
Simon
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