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/mips/cpu/time.c

@@ -0,0 +1,19 @@
+/*
+ * (C) Copyright 2003
+ * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#include <common.h>
+#include <asm/mipsregs.h>
+
+unsigned long notrace timer_read_counter(void)
+{
+	return read_c0_count();
+}
+
+ulong notrace get_tbclk(void)
+{
+	return CONFIG_SYS_MIPS_TIMER_FREQ;
+}