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Blackfin: add os log functions

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Part of the mini Blackfin ABI with operating systems is that they can use
0x4f0-0x4f8 to pass log buffers to/from bootloaders.  So add support to
U-Boot for reading the log buffer.

Signed-off-by: Mike Frysinger <vapier@gentoo.org>
This commit is contained in:
Mike Frysinger 2009-07-09 01:15:05 -04:00
parent d39041fcad
commit 909878fd3f
4 changed files with 40 additions and 1 deletions
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2
cpu/blackfin/Makefile
View File

@ -17,7 +17,7 @@ EXTRA :=
CEXTRA := initcode.o
SEXTRA := start.o
SOBJS := interrupt.o cache.o
COBJS-y := cpu.o traps.o interrupts.o reset.o serial.o watchdog.o
COBJS-y := cpu.o traps.o interrupts.o os_log.o reset.o serial.o watchdog.o
COBJS-$(CONFIG_JTAG_CONSOLE) += jtag-console.o
ifeq ($(CONFIG_BFIN_BOOT_MODE),BFIN_BOOT_BYPASS)

30
cpu/blackfin/os_log.c Normal file
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@ -0,0 +1,30 @@
/*
* functions for handling OS log buffer
*
* Copyright (c) 2009 Analog Devices Inc.
*
* Licensed under the 2-clause BSD.
*/
#include <common.h>
#define OS_LOG_MAGIC 0xDEADBEEF
#define OS_LOG_MAGIC_ADDR ((unsigned long *)0x4f0)
#define OS_LOG_PTR_ADDR ((char **)0x4f4)
bool bfin_os_log_check(void)
{
if (*OS_LOG_MAGIC_ADDR != OS_LOG_MAGIC)
return false;
*OS_LOG_MAGIC_ADDR = 0;
return true;
}
void bfin_os_log_dump(void)
{
char *log = *OS_LOG_PTR_ADDR;
while (*log) {
puts(log);
log += strlen(log) + 1;
}
}

3
include/asm-blackfin/blackfin_local.h
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@ -61,6 +61,9 @@ extern u_long get_sclk(void);
# define bfin_revid() (*pCHIPID >> 28)
extern bool bfin_os_log_check(void);
extern void bfin_os_log_dump(void);
extern void blackfin_icache_flush_range(const void *, const void *);
extern void blackfin_dcache_flush_range(const void *, const void *);
extern void blackfin_icache_dcache_flush_range(const void *, const void *);

6
lib_blackfin/board.c
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@ -384,6 +384,12 @@ void board_init_r(gd_t * id, ulong dest_addr)
post_run(NULL, POST_RAM | post_bootmode_get(0));
#endif
if (bfin_os_log_check()) {
puts("\nLog buffer from operating system:\n");
bfin_os_log_dump();
puts("\n");
}
/* main_loop() can return to retry autoboot, if so just run it again. */
for (;;)
main_loop();