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/bcmcygnus/Makefile

@@ -0,0 +1,7 @@
+#
+# Copyright 2014 Broadcom Corporation.
+#
+# SPDX-License-Identifier:	GPL-2.0+
+#
+
+obj-y	+= reset.o

u-boot/arch/arm/cpu/armv7/bcmcygnus/reset.c

@@ -0,0 +1,20 @@
+/*
+ * Copyright 2014 Broadcom Corporation.
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#include <common.h>
+#include <asm/io.h>
+
+#define CRMU_MAIL_BOX1		0x03024028
+#define CRMU_SOFT_RESET_CMD	0xFFFFFFFF
+
+void reset_cpu(ulong ignored)
+{
+	/* Send soft reset command via Mailbox. */
+	writel(CRMU_SOFT_RESET_CMD, CRMU_MAIL_BOX1);
+
+	while (1)
+		;	/* loop forever till reset */
+}