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/cmd/fitupd.c

@@ -0,0 +1,34 @@
+/*
+ * (C) Copyright 2011
+ * Andreas Pretzsch, carpe noctem engineering, apr@cn-eng.de
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#include <common.h>
+#include <command.h>
+#include <net.h>
+
+#if !defined(CONFIG_UPDATE_TFTP)
+#error "CONFIG_UPDATE_TFTP required"
+#endif
+
+static int do_fitupd(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
+{
+	ulong addr = 0UL;
+
+	if (argc > 2)
+		return CMD_RET_USAGE;
+
+	if (argc == 2)
+		addr = simple_strtoul(argv[1], NULL, 16);
+
+	return update_tftp(addr, NULL, NULL);
+}
+
+U_BOOT_CMD(fitupd, 2, 0, do_fitupd,
+	"update from FIT image",
+	"[addr]\n"
+	"\t- run update from FIT image at addr\n"
+	"\t  or from tftp 'updatefile'"
+);