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/arm/include/asm/arch-rockchip/uart.h

@@ -0,0 +1,44 @@
+/*
+ * (C) Copyright 2015 Rockchip Electronics Co., Ltd
+ *
+ * SPDX-License-Identifier:     GPL-2.0+
+ */
+
+#ifndef __ASM_ARCH_UART_H
+#define __ASM_ARCH_UART_H
+struct rk_uart {
+	unsigned int rbr; /* Receive buffer register. */
+	unsigned int ier; /* Interrupt enable register. */
+	unsigned int fcr; /* FIFO control register. */
+	unsigned int lcr; /* Line control register. */
+	unsigned int mcr; /* Modem control register. */
+	unsigned int lsr; /* Line status register. */
+	unsigned int msr; /* Modem status register. */
+	unsigned int scr;
+	unsigned int reserved1[(0x30 - 0x20) / 4];
+	unsigned int srbr[(0x70 - 0x30) / 4];
+	unsigned int far;
+	unsigned int tfr;
+	unsigned int rfw;
+	unsigned int usr;
+	unsigned int tfl;
+	unsigned int rfl;
+	unsigned int srr;
+	unsigned int srts;
+	unsigned int sbcr;
+	unsigned int sdmam;
+	unsigned int sfe;
+	unsigned int srt;
+	unsigned int stet;
+	unsigned int htx;
+	unsigned int dmasa;
+	unsigned int reserver2[(0xf4 - 0xac) / 4];
+	unsigned int cpr;
+	unsigned int ucv;
+	unsigned int ctr;
+};
+
+void rk_uart_init(void *base);
+void print_hex(unsigned int n);
+void print(char *s);
+#endif