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/include/logbuff.h

@@ -0,0 +1,49 @@
+/*
+ * (C) Copyright 2002-2007
+ * Detlev Zundel, dzu@denx.de.
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+#ifndef _LOGBUFF_H
+#define _LOGBUFF_H
+
+#ifdef CONFIG_LOGBUFFER
+
+#define LOGBUFF_MAGIC	0xc0de4ced	/* Forced by code, eh!	*/
+#define LOGBUFF_LEN	(16384)	/* Must be 16k right now */
+#define LOGBUFF_MASK	(LOGBUFF_LEN-1)
+#define LOGBUFF_OVERHEAD (4096) /* Logbuffer overhead for extra info */
+#define LOGBUFF_RESERVE (LOGBUFF_LEN+LOGBUFF_OVERHEAD)
+
+/* The mapping used here has to be the same as in setup_ext_logbuff ()
+   in linux/kernel/printk */
+
+typedef struct {
+	union {
+		struct {
+			unsigned long	tag;
+			unsigned long	start;
+			unsigned long	con;
+			unsigned long	end;
+			unsigned long	chars;
+		} v2;
+		struct {
+			unsigned long	dummy;
+			unsigned long	tag;
+			unsigned long	start;
+			unsigned long	size;
+			unsigned long	chars;
+		} v1;
+	};
+	unsigned char	buf[0];
+} logbuff_t;
+
+int drv_logbuff_init (void);
+void logbuff_init_ptrs (void);
+void logbuff_log(char *msg);
+void logbuff_reset (void);
+unsigned long logbuffer_base (void);
+
+#endif /* CONFIG_LOGBUFFER */
+
+#endif /* _LOGBUFF_H */