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/board/gaisler/grsim_leon2/grsim_leon2.c

@@ -0,0 +1,27 @@
+/*
+ * GRSIM/TSIM board
+ *
+ * (C) Copyright 2007
+ * Daniel Hellstrom, Gaisler Research, daniel@gaisler.com.
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#include <common.h>
+#include <asm/leon.h>
+
+phys_size_t initdram(int board_type)
+{
+	return 1;
+}
+
+int checkboard(void)
+{
+	puts("Board: GRSIM/TSIM LEON2\n");
+	return 0;
+}
+
+int misc_init_r(void)
+{
+	return 0;
+}