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/xusb-padctl-dummy.c

@@ -0,0 +1,39 @@
+/*
+ * Copyright (c) 2014, NVIDIA CORPORATION.  All rights reserved.
+ *
+ * SPDX-License-Identifier: GPL-2.0
+ */
+
+#include <common.h>
+#include <errno.h>
+
+#include <asm/arch-tegra/xusb-padctl.h>
+
+struct tegra_xusb_phy * __weak tegra_xusb_phy_get(unsigned int type)
+{
+	return NULL;
+}
+
+int __weak tegra_xusb_phy_prepare(struct tegra_xusb_phy *phy)
+{
+	return -ENOSYS;
+}
+
+int __weak tegra_xusb_phy_enable(struct tegra_xusb_phy *phy)
+{
+	return -ENOSYS;
+}
+
+int __weak tegra_xusb_phy_disable(struct tegra_xusb_phy *phy)
+{
+	return -ENOSYS;
+}
+
+int __weak tegra_xusb_phy_unprepare(struct tegra_xusb_phy *phy)
+{
+	return -ENOSYS;
+}
+
+void __weak tegra_xusb_padctl_init(const void *fdt)
+{
+}