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/avr32/include/asm/global_data.h

@@ -0,0 +1,18 @@
+/*
+ * Copyright (C) 2004-2006 Atmel Corporation
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+#ifndef __ASM_GLOBAL_DATA_H__
+#define __ASM_GLOBAL_DATA_H__
+
+/* Architecture-specific global data */
+struct arch_global_data {
+	unsigned long cpu_hz;		/* cpu core clock frequency */
+};
+
+#include <asm-generic/global_data.h>
+
+#define DECLARE_GLOBAL_DATA_PTR register gd_t *gd asm("r5")
+
+#endif /* __ASM_GLOBAL_DATA_H__ */