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 --- cpu/blackfin/Makefile | 2 +- cpu/blackfin/os_log.c | 30 ++++++++++++++++++++++++++++++ include/asm-blackfin/blackfin_local.h | 3 +++ lib_blackfin/board.c | 6 ++++++ 4 files changed, 40 insertions(+), 1 deletions(-) create mode 100644 cpu/blackfin/os_log.c
diff --git a/cpu/blackfin/Makefile b/cpu/blackfin/Makefile index 1378fd1..f684106 100644 --- a/cpu/blackfin/Makefile +++ b/cpu/blackfin/Makefile @@ -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) diff --git a/cpu/blackfin/os_log.c b/cpu/blackfin/os_log.c new file mode 100644 index 0000000..e1c8e29 --- /dev/null +++ b/cpu/blackfin/os_log.c @@ -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; + } +} diff --git a/include/asm-blackfin/blackfin_local.h b/include/asm-blackfin/blackfin_local.h index e17d8a2..8ec7928 100644 --- a/include/asm-blackfin/blackfin_local.h +++ b/include/asm-blackfin/blackfin_local.h @@ -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 *); diff --git a/lib_blackfin/board.c b/lib_blackfin/board.c index 047f164..96ec3bb 100644 --- a/lib_blackfin/board.c +++ b/lib_blackfin/board.c @@ -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();