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/include/asm/cachectl.h

@@ -0,0 +1,24 @@
+/*
+ * Copyright (C) 1994, 1995, 1996 by Ralf Baechle
+ *
+ * SPDX-License-Identifier:	GPL-2.0
+ */
+#ifndef	_ASM_CACHECTL
+#define	_ASM_CACHECTL
+
+/*
+ * Options for cacheflush system call
+ */
+#define	ICACHE	(1<<0)		/* flush instruction cache        */
+#define	DCACHE	(1<<1)		/* writeback and flush data cache */
+#define	BCACHE	(ICACHE|DCACHE)	/* flush both caches              */
+
+/*
+ * Caching modes for the cachectl(2) call
+ *
+ * cachectl(2) is currently not supported and returns ENOSYS.
+ */
+#define CACHEABLE	0	/* make pages cacheable */
+#define UNCACHEABLE	1	/* make pages uncacheable */
+
+#endif	/* _ASM_CACHECTL */