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debug_ll: Add some usage comments 

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
This commit is contained in:
Sascha Hauer 2012-11-23 10:03:20 +01:00
parent 9fe8679d3b
commit 4845ffaf0f
2 changed files with 17 additions and 1 deletions
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2
common/Kconfig
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@ -667,6 +667,8 @@ config DEBUG_LL
prompt "low level debug messages"
help
Enable this to get low level debug messages during barebox initialization.
This requires SoC specific support. Most SoCs require the debug UART to be
initialized by a debugger or first stage bootloader.
endmenu

16
include/debug_ll.h
View File

@ -1,4 +1,5 @@
/* debug_ll.h
/*
* debug_ll.h
*
* written by Marc Singer
* 12 Feb 2005
@ -20,6 +21,14 @@
#define __INCLUDE_DEBUG_LL_H__
#if defined (CONFIG_DEBUG_LL)
/*
* mach/debug_ll.h should implement PUTC_LL. This can be a macro or a static
* inline function. Note that several SoCs expect the UART to be initialized
* by a debugger or a first stage bootloader. You won't see anything without
* this initialization. Depending on the PUTC_LL implementation the board might
* also hang in PUTC_LL without proper initialization.
*/
# include <mach/debug_ll.h>
# define PUTHEX_LL(value) ({ unsigned long v = (unsigned long) (value); \
@ -29,6 +38,11 @@
ch += (ch >= 10) ? 'a' - 10 : '0';\
PUTC_LL (ch); }})
/*
* Be careful with PUTS_LL, it only works if the binary is running at the
* link address which often is not the case during early startup. If in doubt
* don't use it.
*/
static __inline__ void PUTS_LL(const char * str)
{
while (*str) {