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/cpu.h

@@ -0,0 +1,23 @@
+/*
+ *  U-Boot - cpu.h
+ *
+ *  Copyright (c) 2005-2007 Analog Devices Inc.
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#ifndef _CPU_H_
+#define _CPU_H_
+
+#include <command.h>
+
+void board_reset(void) __attribute__((__weak__));
+void bfin_dump(struct pt_regs *reg);
+void bfin_panic(struct pt_regs *reg);
+void dump(struct pt_regs *regs);
+
+asmlinkage void trap(void);
+asmlinkage void evt_nmi(void);
+asmlinkage void evt_default(void);
+
+#endif