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-rockchip/board.c

@@ -0,0 +1,104 @@
+/*
+ * (C) Copyright 2015 Google, Inc
+ *
+ * SPDX-License-Identifier:     GPL-2.0+
+ */
+
+#include <common.h>
+#include <clk.h>
+#include <dm.h>
+#include <ram.h>
+#include <asm/io.h>
+#include <asm/arch/clock.h>
+
+DECLARE_GLOBAL_DATA_PTR;
+
+int board_init(void)
+{
+	return 0;
+}
+
+int dram_init(void)
+{
+	struct ram_info ram;
+	struct udevice *dev;
+	int ret;
+
+	ret = uclass_get_device(UCLASS_RAM, 0, &dev);
+	if (ret) {
+		debug("DRAM init failed: %d\n", ret);
+		return ret;
+	}
+	ret = ram_get_info(dev, &ram);
+	if (ret) {
+		debug("Cannot get DRAM size: %d\n", ret);
+		return ret;
+	}
+	debug("SDRAM base=%lx, size=%x\n", ram.base, ram.size);
+	gd->ram_size = ram.size;
+
+	return 0;
+}
+
+#ifndef CONFIG_SYS_DCACHE_OFF
+void enable_caches(void)
+{
+	/* Enable D-cache. I-cache is already enabled in start.S */
+	dcache_enable();
+}
+#endif
+
+void lowlevel_init(void)
+{
+}
+
+static int do_clock(cmd_tbl_t *cmdtp, int flag, int argc,
+		       char * const argv[])
+{
+	static const struct {
+		char *name;
+		int id;
+	} clks[] = {
+		{ "osc", CLK_OSC },
+		{ "apll", CLK_ARM },
+		{ "dpll", CLK_DDR },
+		{ "cpll", CLK_CODEC },
+		{ "gpll", CLK_GENERAL },
+#ifdef CONFIG_ROCKCHIP_RK3036
+		{ "mpll", CLK_NEW },
+#else
+		{ "npll", CLK_NEW },
+#endif
+	};
+	int ret, i;
+	struct udevice *dev;
+
+	ret = uclass_get_device(UCLASS_CLK, 0, &dev);
+	if (ret) {
+		printf("clk-uclass not found\n");
+		return 0;
+	}
+
+	for (i = 0; i < ARRAY_SIZE(clks); i++) {
+		struct clk clk;
+		ulong rate;
+
+		clk.id = clks[i].id;
+		ret = clk_request(dev, &clk);
+		if (ret < 0)
+			continue;
+
+		rate = clk_get_rate(&clk);
+		printf("%s: %lu\n", clks[i].name, rate);
+
+		clk_free(&clk);
+	}
+
+	return 0;
+}
+
+U_BOOT_CMD(
+	clock, 2, 1, do_clock,
+	"display information about clocks",
+	""
+);