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/microblaze/cpu/spl.c

@@ -0,0 +1,52 @@
+/*
+ * (C) Copyright 2013 - 2014 Xilinx, Inc
+ *
+ * Michal Simek <michal.simek@xilinx.com>
+ *
+ * SPDX-License-Identifier:     GPL-2.0+
+ */
+
+#include <common.h>
+#include <image.h>
+#include <spl.h>
+#include <asm/io.h>
+#include <asm/u-boot.h>
+
+DECLARE_GLOBAL_DATA_PTR;
+
+bool boot_linux;
+
+u32 spl_boot_device(void)
+{
+	return BOOT_DEVICE_NOR;
+}
+
+/* Board initialization after bss clearance */
+void spl_board_init(void)
+{
+	/* enable console uart printing */
+	preloader_console_init();
+}
+
+#ifdef CONFIG_SPL_OS_BOOT
+void __noreturn jump_to_image_linux(void *arg)
+{
+	debug("Entering kernel arg pointer: 0x%p\n", arg);
+	typedef void (*image_entry_arg_t)(char *, ulong, ulong)
+		__attribute__ ((noreturn));
+	image_entry_arg_t image_entry =
+		(image_entry_arg_t)spl_image.entry_point;
+
+	image_entry(NULL, 0, (ulong)arg);
+}
+#endif /* CONFIG_SPL_OS_BOOT */
+
+int spl_start_uboot(void)
+{
+#ifdef CONFIG_SPL_OS_BOOT
+	if (boot_linux)
+		return 0;
+#endif
+
+	return 1;
+}