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/include/usb/lin_gadget_compat.h

@@ -0,0 +1,40 @@
+/*
+ * Copyright (c) 2011 Samsung Electronics
+ * Lukasz Majewski <l.majewski@samsung.com>
+ *
+ * This is a Linux kernel compatibility layer for USB Gadget
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#ifndef __LIN_COMPAT_H__
+#define __LIN_COMPAT_H__
+
+#include <linux/compat.h>
+
+/* common */
+#define ENOTSUPP	524	/* Operation is not supported */
+
+#define BITS_PER_BYTE				8
+#define BITS_TO_LONGS(nr) \
+	DIV_ROUND_UP(nr, BITS_PER_BYTE * sizeof(long))
+#define DECLARE_BITMAP(name, bits) \
+	unsigned long name[BITS_TO_LONGS(bits)]
+
+#define small_const_nbits(nbits) \
+	(__builtin_constant_p(nbits) && (nbits) <= BITS_PER_LONG)
+
+static inline void bitmap_zero(unsigned long *dst, int nbits)
+{
+	if (small_const_nbits(nbits))
+		*dst = 0UL;
+	else {
+		int len = BITS_TO_LONGS(nbits) * sizeof(unsigned long);
+		memset(dst, 0, len);
+	}
+}
+
+#define dma_cache_maint(addr, size, mode) cache_flush()
+void cache_flush(void);
+
+#endif /* __LIN_COMPAT_H__ */