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-tegra/lowlevel_init.S

@@ -0,0 +1,40 @@
+/*
+ * SoC-specific setup info
+ *
+ * (C) Copyright 2010,2011
+ * NVIDIA Corporation <www.nvidia.com>
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#include <config.h>
+#include <linux/linkage.h>
+
+#ifdef CONFIG_ARM64
+	.align	5
+ENTRY(reset_cpu)
+	/* get address for global reset register */
+	ldr	x1, =PRM_RSTCTRL
+	ldr	w3, [x1]
+	/* force reset */
+	orr	w3, w3, #0x10
+	str	w3, [x1]
+	mov	w0, w0
+1:
+	b	1b
+ENDPROC(reset_cpu)
+#else
+	.align	5
+ENTRY(reset_cpu)
+	ldr	r1, rstctl			@ get addr for global reset
+						@ reg
+	ldr	r3, [r1]
+	orr	r3, r3, #0x10
+	str	r3, [r1]			@ force reset
+	mov	r0, r0
+_loop_forever:
+	b	_loop_forever
+rstctl:
+	.word	PRM_RSTCTRL
+ENDPROC(reset_cpu)
+#endif