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/x86/lib/cmd_boot.c

@@ -0,0 +1,50 @@
+/*
+ * (C) Copyright 2008-2011
+ * Graeme Russ, <graeme.russ@gmail.com>
+ *
+ * (C) Copyright 2002
+ * Daniel Engström, Omicron Ceti AB, <daniel@omicron.se>
+ *
+ * (C) Copyright 2002
+ * Wolfgang Denk, DENX Software Engineering, <wd@denx.de>
+ *
+ * (C) Copyright 2002
+ * Sysgo Real-Time Solutions, GmbH <www.elinos.com>
+ * Marius Groeger <mgroeger@sysgo.de>
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#include <common.h>
+#include <command.h>
+#include <malloc.h>
+#include <asm/u-boot-x86.h>
+
+DECLARE_GLOBAL_DATA_PTR;
+
+unsigned long do_go_exec(ulong (*entry)(int, char * const []),
+			 int argc, char * const argv[])
+{
+	unsigned long ret = 0;
+	char **argv_tmp;
+
+	/*
+	 * x86 does not use a dedicated register to pass the pointer to
+	 * the global_data, so it is instead passed as argv[-1]. By using
+	 * argv[-1], the called 'Application' can use the contents of
+	 * argv natively. However, to safely use argv[-1] a new copy of
+	 * argv is needed with the extra element
+	 */
+	argv_tmp = malloc(sizeof(char *) * (argc + 1));
+
+	if (argv_tmp) {
+		argv_tmp[0] = (char *)gd;
+
+		memcpy(&argv_tmp[1], argv, (size_t)(sizeof(char *) * argc));
+
+		ret = (entry) (argc, &argv_tmp[1]);
+		free(argv_tmp);
+	}
+
+	return ret;
+}