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/sh/lib/udivsi3_i4i-Os.S

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+/* Copyright (C) 2006 Free Software Foundation, Inc.
+
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+/* Moderately Space-optimized libgcc routines for the Renesas SH /
+   STMicroelectronics ST40 CPUs.
+   Contributed by J"orn Rennecke joern.rennecke@st.com.  */
+
+/* Size: 186 bytes jointly for udivsi3_i4i and sdivsi3_i4i
+   sh4-200 run times:
+   udiv small divisor: 55 cycles
+   udiv large divisor: 52 cycles
+   sdiv small divisor, positive result: 59 cycles
+   sdiv large divisor, positive result: 56 cycles
+   sdiv small divisor, negative result: 65 cycles (*)
+   sdiv large divisor, negative result: 62 cycles (*)
+   (*): r2 is restored in the rts delay slot and has a lingering latency
+        of two more cycles.  */
+	.balign 4
+	.global	__udivsi3_i4i
+	.global	__udivsi3_i4
+	.set	__udivsi3_i4, __udivsi3_i4i
+	.type	__udivsi3_i4i, @function
+	.type	__sdivsi3_i4i, @function
+__udivsi3_i4i:
+	sts pr,r1
+	mov.l r4,@-r15
+	extu.w r5,r0
+	cmp/eq r5,r0
+	swap.w r4,r0
+	shlr16 r4
+	bf/s large_divisor
+	div0u
+	mov.l r5,@-r15
+	shll16 r5
+sdiv_small_divisor:
+	div1 r5,r4
+	bsr div6
+	div1 r5,r4
+	div1 r5,r4
+	bsr div6
+	div1 r5,r4
+	xtrct r4,r0
+	xtrct r0,r4
+	bsr div7
+	swap.w r4,r4
+	div1 r5,r4
+	bsr div7
+	div1 r5,r4
+	xtrct r4,r0
+	mov.l @r15+,r5
+	swap.w r0,r0
+	mov.l @r15+,r4
+	jmp @r1
+	rotcl r0
+div7:
+	div1 r5,r4
+div6:
+	            div1 r5,r4; div1 r5,r4; div1 r5,r4
+	div1 r5,r4; div1 r5,r4; rts;        div1 r5,r4
+
+divx3:
+	rotcl r0
+	div1 r5,r4
+	rotcl r0
+	div1 r5,r4
+	rotcl r0
+	rts
+	div1 r5,r4
+
+large_divisor:
+	mov.l r5,@-r15
+sdiv_large_divisor:
+	xor r4,r0
+	.rept 4
+	rotcl r0
+	bsr divx3
+	div1 r5,r4
+	.endr
+	mov.l @r15+,r5
+	mov.l @r15+,r4
+	jmp @r1
+	rotcl r0
+
+	.global	__sdivsi3_i4i
+	.global __sdivsi3_i4
+	.global __sdivsi3
+	.set	__sdivsi3_i4, __sdivsi3_i4i
+	.set	__sdivsi3, __sdivsi3_i4i
+__sdivsi3_i4i:
+	mov.l r4,@-r15
+	cmp/pz r5
+	mov.l r5,@-r15
+	bt/s pos_divisor
+	cmp/pz r4
+	neg r5,r5
+	extu.w r5,r0
+	bt/s neg_result
+	cmp/eq r5,r0
+	neg r4,r4
+pos_result:
+	swap.w r4,r0
+	bra sdiv_check_divisor
+	sts pr,r1
+pos_divisor:
+	extu.w r5,r0
+	bt/s pos_result
+	cmp/eq r5,r0
+	neg r4,r4
+neg_result:
+	mova negate_result,r0
+	;
+	mov r0,r1
+	swap.w r4,r0
+	lds r2,macl
+	sts pr,r2
+sdiv_check_divisor:
+	shlr16 r4
+	bf/s sdiv_large_divisor
+	div0u
+	bra sdiv_small_divisor
+	shll16 r5
+	.balign 4
+negate_result:
+	neg r0,r0
+	jmp @r2
+	sts macl,r2