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/nds32/include/asm/macro.h

@@ -0,0 +1,80 @@
+/*
+ * include/asm-nds32/macro.h
+ *
+ * Copyright (C) 2009 Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
+ * Copyright (C) 2011 Andes Technology Corporation
+ * Macpaul Lin, Andes Technology Corporation <macpaul@andestech.com>
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#ifndef __ASM_NDS_MACRO_H
+#define __ASM_NDS_MACRO_H
+#ifdef __ASSEMBLY__
+
+/*
+ * These macros provide a convenient way to write 8, 16 and 32 bit data
+ * to an "immediate address (address used by periphal)" only.
+ * Registers r4 and r5 are used, any data in these registers are
+ * overwritten by the macros.
+ * The macros are valid for any NDS32 architecture, they do not implement
+ * any memory barriers so caution is recommended when using these when the
+ * caches are enabled or on a multi-core system.
+ */
+
+.macro	write32, addr, data
+	li	$r4, \addr
+	li	$r5, \data
+	swi	$r5, [$r4]
+.endm
+
+.macro	write16, addr, data
+	li	$r4, \addr
+	li	$r5, \data
+	shi	$r5, [$r4]
+.endm
+
+.macro	write8, addr, data
+	li	$r4, \addr
+	li	$r5, \data
+	sbi	$r5, [$r4]
+.endm
+
+/*
+ * This macro read a value from a register, then do OR operation
+ * (set bit fields) to the value, and then store it back to the register.
+ * Note: Instruction 'ori' supports immediate value up to 15 bits.
+ */
+.macro	setbf32, addr, data
+	li	$r4, \addr
+	lwi	$r5, [$r4]
+	li	$r6, \data
+	or	$r5, $r5, $r6
+	swi	$r5, [$r4]
+.endm
+
+.macro	setbf15, addr, data
+	li	$r4, \addr
+	lwi	$r5, [$r4]
+	ori	$r5, $r5, \data
+	swi	$r5, [$r4]
+.endm
+
+/*
+ * This macro generates a loop that can be used for delays in the code.
+ * Register r4 is used, any data in this register is overwritten by the
+ * macro.
+ * The macro is valid for any NDS32 architeture. The actual time spent in the
+ * loop will vary from CPU to CPU though.
+ */
+
+.macro	wait_timer, time
+	li	$r4, \time
+1:
+	nop
+	addi	$r4, $r4, -1
+	bnez    $r4, 1b
+.endm
+
+#endif /* __ASSEMBLY__ */
+#endif /* __ASM_ARM_MACRO_H */