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/mach-zynq/lowlevel_init.S

@@ -0,0 +1,26 @@
+/*
+ * Copyright (C) 2013 Xilinx, Inc. All rights reserved.
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#include <asm-offsets.h>
+#include <config.h>
+#include <linux/linkage.h>
+
+ENTRY(lowlevel_init)
+
+	/* Enable the the VFP */
+	mrc	p15, 0, r1, c1, c0, 2
+	orr	r1, r1, #(0x3 << 20)
+	orr	r1, r1, #(0x3 << 20)
+	mcr	p15, 0, r1, c1, c0, 2
+	isb
+	fmrx	r1, FPEXC
+	orr	r1,r1, #(1<<30)
+	fmxr	FPEXC, r1
+
+	/* Move back to caller */
+	mov	pc, lr
+
+ENDPROC(lowlevel_init)