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/board/tcl/sl50/board.h

@@ -0,0 +1,22 @@
+/*
+ * board.h
+ *
+ * TCL SL50 boards information header
+ *
+ * Copyright (C) 2011, Texas Instruments, Incorporated - http://www.ti.com/
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#ifndef _BOARD_H_
+#define _BOARD_H_
+
+void enable_uart0_pin_mux(void);
+void enable_uart1_pin_mux(void);
+void enable_uart2_pin_mux(void);
+void enable_uart3_pin_mux(void);
+void enable_uart4_pin_mux(void);
+void enable_uart5_pin_mux(void);
+void enable_i2c0_pin_mux(void);
+void enable_board_pin_mux(void);
+#endif