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/avr32/lib/memset.S

@@ -0,0 +1,65 @@
+/*
+ * Copyright (C) 2004-2006 Atmel Corporation
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+	/*
+	 * r12:	void *b
+	 * r11:	int c
+	 * r10:	size_t len
+	 *
+	 * Returns b in r12
+	 */
+	.section .text.memset, "ax", @progbits
+
+	.global	memset
+	.type	memset, @function
+	.align	2
+memset:
+	mov	r9, r12
+	mov	r8, r12
+	or	r11, r11, r11 << 8
+	andl	r9, 3, COH
+	brne	1f
+
+2:	or	r11, r11, r11 << 16
+	sub	r10, 4
+	brlt	5f
+
+	/* Let's do some real work */
+4:	st.w	r8++, r11
+	sub	r10, 4
+	brge	4b
+
+	/*
+	 * When we get here, we've got less than 4 bytes to set. r10
+	 * might be negative.
+	 */
+5:	sub	r10, -4
+	reteq	r12
+
+	/* Fastpath ends here, exactly 32 bytes from memset */
+
+	/* Handle unaligned count or pointer */
+	bld	r10, 1
+	brcc	6f
+	st.b	r8++, r11
+	st.b	r8++, r11
+	bld	r10, 0
+	retcc	r12
+6:	st.b	r8++, r11
+	mov	pc, lr
+
+	/* Handle unaligned pointer */
+1:	sub	r10, 4
+	brlt	5b
+	add	r10, r9
+	lsl	r9, 1
+	add	pc, r9
+	st.b	r8++, r11
+	st.b	r8++, r11
+	st.b	r8++, r11
+	rjmp	2b
+
+	.size	memset, . - memset