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/blackfin/include/asm/delay.h

@@ -0,0 +1,39 @@
+/*
+ * U-Boot - delay.h Routines for introducing delays
+ *
+ * Copyright (c) 2005-2007 Analog Devices Inc.
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#ifndef _BLACKFIN_DELAY_H
+#define _BLACKFIN_DELAY_H
+
+/*
+ * Changes made by akbar.hussain@Lineo.com, for BLACKFIN
+ * Copyright (C) 1994 Hamish Macdonald
+ *
+ * Delay routines, using a pre-computed "loops_per_second" value.
+ */
+
+static __inline__ void __delay(unsigned long loops)
+{
+	__asm__ __volatile__("1:\t%0 += -1;\n\t"
+			     "cc = %0 == 0;\n\t"
+			     "if ! cc jump 1b;\n":"=d"(loops)
+			     :"0"(loops));
+}
+
+/*
+ * Use only for very small delays ( < 1 msec).  Should probably use a
+ * lookup table, really, as the multiplications take much too long with
+ * short delays.  This is a "reasonable" implementation, though (and the
+ * first constant multiplications gets optimized away if the delay is
+ * a constant)
+ */
+static __inline__ void __udelay(unsigned long usecs)
+{
+	__delay(usecs);
+}
+
+#endif