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/cpu/armv7/bcm281xx/reset.c

@@ -0,0 +1,27 @@
+/*
+ * Copyright 2013 Broadcom Corporation.
+ *
+ * SPDX-License-Identifier:      GPL-2.0+
+ */
+
+#include <common.h>
+#include <asm/io.h>
+#include <asm/arch/sysmap.h>
+
+#define EN_MASK		0x08000000	/* Enable timer */
+#define SRSTEN_MASK	0x04000000	/* Enable soft reset */
+#define CLKS_SHIFT	20		/* Clock period shift */
+#define LD_SHIFT	0		/* Reload value shift */
+
+void reset_cpu(ulong ignored)
+{
+	/*
+	 * Set WD enable, RST enable,
+	 * 3.9 msec clock period (8), reload value (8*3.9ms)
+	 */
+	u32 reg = EN_MASK + SRSTEN_MASK + (8 << CLKS_SHIFT) + (8 << LD_SHIFT);
+	writel(reg, SECWD2_BASE_ADDR);
+
+	while (1)
+		;	/* loop forever till reset */
+}