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/common/exports.c

@@ -0,0 +1,30 @@
+#include <common.h>
+#include <exports.h>
+#include <spi.h>
+#include <i2c.h>
+
+DECLARE_GLOBAL_DATA_PTR;
+
+__attribute__((unused)) static void dummy(void)
+{
+}
+
+unsigned long get_version(void)
+{
+	return XF_VERSION;
+}
+
+#define EXPORT_FUNC(f, a, x, ...)  gd->jt->x = f;
+
+#ifndef CONFIG_PHY_AQUANTIA
+# define mdio_get_current_dev		dummy
+# define phy_find_by_mask		dummy
+# define mdio_phydev_for_ethname	dummy
+# define miiphy_set_current_dev		dummy
+#endif
+
+void jumptable_init(void)
+{
+	gd->jt = malloc(sizeof(struct jt_funcs));
+#include <_exports.h>
+}