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/include/asm/arch-tegra20/flow.h

@@ -0,0 +1,20 @@
+/*
+ * (C) Copyright 2010, 2011
+ * NVIDIA Corporation <www.nvidia.com>
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#ifndef _FLOW_H_
+#define _FLOW_H_
+
+struct flow_ctlr {
+	u32	halt_cpu_events;
+	u32	halt_cop_events;
+	u32	cpu_csr;
+	u32	cop_csr;
+	u32	halt_cpu1_events;
+	u32	cpu1_csr;
+};
+
+#endif