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/avr32/lib/interrupts.c

@@ -0,0 +1,35 @@
+/*
+ * Copyright (C) 2006 Atmel Corporation
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+#include <common.h>
+
+#include <asm/sysreg.h>
+
+int interrupt_init(void)
+{
+	return 0;
+}
+
+void enable_interrupts(void)
+{
+	asm volatile("csrf	%0" : : "n"(SYSREG_GM_OFFSET));
+}
+
+int disable_interrupts(void)
+{
+	unsigned long sr;
+
+	sr = sysreg_read(SR);
+	asm volatile("ssrf	%0" : : "n"(SYSREG_GM_OFFSET));
+
+#ifdef CONFIG_AT32UC3A0xxx
+	/* Two NOPs are required after masking interrupts on the
+	 * AT32UC3A0512ES. See errata 41.4.5.5. */
+	asm("nop");
+	asm("nop");
+#endif
+
+	return !SYSREG_BFEXT(GM, sr);
+}