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/qca/ap143/ap143.c

@@ -0,0 +1,68 @@
+/*
+ * Copyright (C) 2015-2016 Wills Wang <wills.wang@live.com>
+ *
+ * SPDX-License-Identifier: GPL-2.0+
+ */
+
+#include <common.h>
+#include <asm/io.h>
+#include <asm/addrspace.h>
+#include <asm/types.h>
+#include <mach/ar71xx_regs.h>
+#include <mach/ddr.h>
+#include <mach/ath79.h>
+#include <debug_uart.h>
+
+DECLARE_GLOBAL_DATA_PTR;
+
+#ifdef CONFIG_DEBUG_UART_BOARD_INIT
+void board_debug_uart_init(void)
+{
+	void __iomem *regs;
+	u32 val;
+
+	regs = map_physmem(AR71XX_GPIO_BASE, AR71XX_GPIO_SIZE,
+			   MAP_NOCACHE);
+
+	/*
+	 * GPIO9 as input, GPIO10 as output
+	 */
+	val = readl(regs + AR71XX_GPIO_REG_OE);
+	val |= QCA953X_GPIO(9);
+	val &= ~QCA953X_GPIO(10);
+	writel(val, regs + AR71XX_GPIO_REG_OE);
+
+	/*
+	 * Enable GPIO10 as UART0_SOUT
+	 */
+	val = readl(regs + QCA953X_GPIO_REG_OUT_FUNC2);
+	val &= ~QCA953X_GPIO_MUX_MASK(16);
+	val |= QCA953X_GPIO_OUT_MUX_UART0_SOUT << 16;
+	writel(val, regs + QCA953X_GPIO_REG_OUT_FUNC2);
+
+	/*
+	 * Enable GPIO9 as UART0_SIN
+	 */
+	val = readl(regs + QCA953X_GPIO_REG_IN_ENABLE0);
+	val &= ~QCA953X_GPIO_MUX_MASK(8);
+	val |= QCA953X_GPIO_IN_MUX_UART0_SIN << 8;
+	writel(val, regs + QCA953X_GPIO_REG_IN_ENABLE0);
+
+	/*
+	 * Enable GPIO10 output
+	 */
+	val = readl(regs + AR71XX_GPIO_REG_OUT);
+	val |= QCA953X_GPIO(10);
+	writel(val, regs + AR71XX_GPIO_REG_OUT);
+}
+#endif
+
+int board_early_init_f(void)
+{
+#ifdef CONFIG_DEBUG_UART
+	debug_uart_init();
+#endif
+	ddr_init();
+	ath79_eth_reset();
+	return 0;
+}