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/cpu/arm720t/interrupts.c

@@ -0,0 +1,33 @@
+/*
+ * (C) Copyright 2002
+ * Sysgo Real-Time Solutions, GmbH <www.elinos.com>
+ * Marius Groeger <mgroeger@sysgo.de>
+ *
+ * (C) Copyright 2002
+ * Sysgo Real-Time Solutions, GmbH <www.elinos.com>
+ * Alex Zuepke <azu@sysgo.de>
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#include <common.h>
+
+#ifdef CONFIG_USE_IRQ
+void do_irq (struct pt_regs *pt_regs)
+{
+}
+#endif
+
+#if defined(CONFIG_TEGRA)
+static ulong timestamp;
+static ulong lastdec;
+
+int timer_init (void)
+{
+	/* No timer routines for tegra as yet */
+	lastdec = 0;
+	timestamp = 0;
+
+	return 0;
+}
+#endif