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/gpu.c

@@ -0,0 +1,52 @@
+/*
+ * Copyright (c) 2014-2015, NVIDIA CORPORATION.  All rights reserved.
+ *
+ * SPDX-License-Identifier:	GPL-2.0
+ */
+
+/* Tegra vpr routines */
+
+#include <common.h>
+#include <asm/io.h>
+#include <asm/arch/tegra.h>
+#include <asm/arch/mc.h>
+
+#include <fdt_support.h>
+
+static bool _configured;
+
+void tegra_gpu_config(void)
+{
+	struct mc_ctlr *mc = (struct mc_ctlr *)NV_PA_MC_BASE;
+
+	/* Turn VPR off */
+	writel(0, &mc->mc_video_protect_size_mb);
+	writel(TEGRA_MC_VIDEO_PROTECT_REG_WRITE_ACCESS_DISABLED,
+	       &mc->mc_video_protect_reg_ctrl);
+	/* read back to ensure the write went through */
+	readl(&mc->mc_video_protect_reg_ctrl);
+
+	debug("configured VPR\n");
+
+	_configured = true;
+}
+
+#if defined(CONFIG_OF_LIBFDT)
+
+int tegra_gpu_enable_node(void *blob, const char *compat)
+{
+	int offset;
+
+	if (!_configured)
+		return 0;
+
+	offset = fdt_node_offset_by_compatible(blob, -1, compat);
+	while (offset != -FDT_ERR_NOTFOUND) {
+		fdt_status_okay(blob, offset);
+		offset = fdt_node_offset_by_compatible(blob, offset, compat);
+	}
+
+	return 0;
+}
+
+#endif