avionic design with actual uboot and tooling

submodule of avionic design uboot bootloader and with included tools to
get you started , read readme.md and readme-tk1-loader.md

u-boot/arch/blackfin/cpu/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)
+
+int bfin_os_log_check(void)
+{
+	if (*OS_LOG_MAGIC_ADDR != OS_LOG_MAGIC)
+		return 0;
+	*OS_LOG_MAGIC_ADDR = 0;
+	return 1;
+}
+
+void bfin_os_log_dump(void)
+{
+	char *log = *OS_LOG_PTR_ADDR;
+	while (*log) {
+		puts(log);
+		log += strlen(log) + 1;
+	}
+}