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/arm/lib/eabi_compat.c

@@ -0,0 +1,38 @@
+/*
+ * Utility functions needed for (some) EABI conformant tool chains.
+ *
+ * (C) Copyright 2009 Wolfgang Denk <wd@denx.de>
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#include <common.h>
+
+int raise (int signum)
+{
+	/* Even if printf() is available, it's large. Punt it for SPL builds */
+#if !defined(CONFIG_SPL_BUILD)
+	printf("raise: Signal # %d caught\n", signum);
+#endif
+	return 0;
+}
+
+/* Dummy function to avoid linker complaints */
+void __aeabi_unwind_cpp_pr0(void)
+{
+}
+
+void __aeabi_unwind_cpp_pr1(void)
+{
+}
+
+/* Copy memory like memcpy, but no return value required.  */
+void __aeabi_memcpy(void *dest, const void *src, size_t n)
+{
+	(void) memcpy(dest, src, n);
+}
+
+void __aeabi_memset(void *dest, size_t n, int c)
+{
+	(void) memset(dest, c, n);
+}