Blackfin: add os log functions
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>
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 @@
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;
+ }
+}