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/cpu/sh3/Makefile

@@ -0,0 +1,15 @@
+#
+# (C) Copyright 2000-2006
+# Wolfgang Denk, DENX Software Engineering, wd@denx.de.
+#
+# (C) Copyright 2007
+# Nobuhiro Iwamatsu <iwamatsu@nigauri.org>
+#
+# (C) Copyright 2007
+# Yoshihiro Shimoda <shimoda.yoshihiro@renesas.com>
+#
+# SPDX-License-Identifier:	GPL-2.0+
+#
+
+extra-y	= start.o
+obj-y	= cpu.o interrupts.o watchdog.o cache.o

u-boot/arch/sh/cpu/sh3/cache.c

@@ -0,0 +1,96 @@
+/*
+ * (C) Copyright 2007
+ * Yoshihiro Shimoda <shimoda.yoshihiro@renesas.com>
+ *
+ * (C) Copyright 2007
+ * Nobobuhiro Iwamatsu <iwamatsu@nigauri.org>
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#include <common.h>
+#include <command.h>
+#include <asm/processor.h>
+#include <asm/io.h>
+
+/*
+ * Jump to P2 area.
+ * When handling TLB or caches, we need to do it from P2 area.
+ */
+#define jump_to_P2()                    \
+  do {                                    \
+    unsigned long __dummy;		\
+    __asm__ __volatile__(			\
+		"mov.l  1f, %0\n\t"     \
+		"or     %1, %0\n\t"     \
+		"jmp    @%0\n\t"        \
+		" nop\n\t"              \
+		".balign 4\n"           \
+		"1:     .long 2f\n"     \
+		"2:"                    \
+		: "=&r" (__dummy)       \
+		: "r" (0x20000000));    \
+  } while (0)
+
+/*
+ * Back to P1 area.
+ */
+#define back_to_P1()                                    \
+  do {                                                    \
+    unsigned long __dummy;                          \
+    __asm__ __volatile__(                           \
+		"nop;nop;nop;nop;nop;nop;nop\n\t"       \
+		"mov.l  1f, %0\n\t"                     \
+		"jmp    @%0\n\t"                        \
+		" nop\n\t"                              \
+		".balign 4\n"                           \
+		"1:     .long 2f\n"                     \
+		"2:"                                    \
+		: "=&r" (__dummy));                     \
+  } while (0)
+
+#define CACHE_VALID       1
+#define CACHE_UPDATED     2
+
+static inline void cache_wback_all(void)
+{
+	unsigned long addr, data, i, j;
+
+	jump_to_P2();
+	for (i = 0; i < CACHE_OC_NUM_ENTRIES; i++) {
+		for (j = 0; j < CACHE_OC_NUM_WAYS; j++) {
+			addr = CACHE_OC_ADDRESS_ARRAY
+				| (j << CACHE_OC_WAY_SHIFT)
+				| (i << CACHE_OC_ENTRY_SHIFT);
+			data = inl(addr);
+			if (data & CACHE_UPDATED) {
+				data &= ~CACHE_UPDATED;
+				outl(data, addr);
+			}
+		}
+	}
+	back_to_P1();
+}
+
+
+#define CACHE_ENABLE      0
+#define CACHE_DISABLE     1
+
+int cache_control(unsigned int cmd)
+{
+	unsigned long ccr;
+
+	jump_to_P2();
+	ccr = inl(CCR);
+
+	if (ccr & CCR_CACHE_ENABLE)
+		cache_wback_all();
+
+	if (cmd == CACHE_DISABLE)
+		outl(CCR_CACHE_STOP, CCR);
+	else
+		outl(CCR_CACHE_INIT, CCR);
+	back_to_P1();
+
+	return 0;
+}

u-boot/arch/sh/cpu/sh3/config.mk

@@ -0,0 +1,14 @@
+#
+# (C) Copyright 2000-2004
+# Wolfgang Denk, DENX Software Engineering, wd@denx.de.
+#
+# (C) Copyright 2007
+# Nobuhiro Iwamatsu <iwamatsu@nigauri.org>
+#
+# (C) Copyright 2007
+# Yoshihiro Shimoda <shimoda.yoshihiro@renesas.com>
+#
+# SPDX-License-Identifier:	GPL-2.0+
+#
+#
+PLATFORM_CPPFLAGS += -m3

u-boot/arch/sh/cpu/sh3/cpu.c

@@ -0,0 +1,74 @@
+/*
+ * (C) Copyright 2007
+ * Yoshihiro Shimoda <shimoda.yoshihiro@renesas.com>
+ *
+ * (C) Copyright 2007
+ * Nobuhiro Iwamatsu <iwamatsu@nigauri.org>
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#include <common.h>
+#include <command.h>
+#include <asm/processor.h>
+
+int checkcpu(void)
+{
+	puts("CPU: SH3\n");
+	return 0;
+}
+
+int cpu_init(void)
+{
+	return 0;
+}
+
+int cleanup_before_linux(void)
+{
+	disable_interrupts();
+	return 0;
+}
+
+int do_reset(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
+{
+	disable_interrupts();
+	reset_cpu(0);
+	return 0;
+}
+
+void flush_cache(unsigned long addr, unsigned long size)
+{
+
+}
+
+void icache_enable(void)
+{
+}
+
+void icache_disable(void)
+{
+}
+
+int icache_status(void)
+{
+	return 0;
+}
+
+void dcache_enable(void)
+{
+}
+
+void dcache_disable(void)
+{
+}
+
+int dcache_status(void)
+{
+	return 0;
+}
+
+void relocate_code(ulong start_addr_sp, gd_t *new_gd, ulong relocaaddr)
+{
+	/* TODO(sh maintainer): Implement this */
+	while (1);
+}

u-boot/arch/sh/cpu/sh3/interrupts.c

@@ -0,0 +1,26 @@
+/*
+ * (C) Copyright 2007
+ * Yoshihiro Shimoda <shimoda.yoshihiro@renesas.com>
+ *
+ * (C) Copyright 2007
+ * Nobuhiro Iwamatsu <iwamatsu@nigauri.org>
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#include <common.h>
+
+int interrupt_init(void)
+{
+	return 0;
+}
+
+void enable_interrupts(void)
+{
+
+}
+
+int disable_interrupts(void)
+{
+	return 0;
+}

u-boot/arch/sh/cpu/sh3/start.S

@@ -0,0 +1,65 @@
+/*
+ * (C) Copyright 2007
+ * Yoshihiro Shimoda <shimoda.yoshihiro@renesas.com>
+ *
+ * (C) Copyright 2007
+ * Nobuhiro Iwamatsu <iwamatsu@nigauri.org>
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#include <asm-offsets.h>
+#include <config.h>
+
+	.text
+	.align	2
+
+	.global	_start
+_sh_start:
+	mov.l	._lowlevel_init, r0
+100:	bsrf	r0
+	nop
+
+	bsr	1f
+	nop
+1:	sts	pr, r5
+	mov.l	._reloc_dst, r4
+	add	#(_sh_start-1b), r5
+	mov.l	._reloc_dst_end, r6
+
+2:	mov.l	@r5+, r1
+	mov.l	r1, @r4
+	add	#4, r4
+	cmp/hs	r6, r4
+	bf	2b
+
+	mov.l	._bss_start, r4
+	mov.l	._bss_end, r5
+	mov	#0, r1
+
+3:	mov.l	r1, @r4			/* bss clear */
+	add	#4, r4
+	cmp/hs	r5, r4
+	bf	3b
+
+	mov.l	._gd_init, r13		/* global data */
+	mov.l	._stack_init, r15	/* stack */
+
+	#TODO(sh maintainer): Fix this up to call the correct code
+	#mov.l	._sh_generic_init, r0
+	#jsr	@r0
+	nop
+
+loop:
+	bra	loop
+
+	.align	2
+
+._lowlevel_init:	.long	(lowlevel_init - (100b + 4))
+._reloc_dst:		.long	reloc_dst
+._reloc_dst_end:	.long	reloc_dst_end
+._bss_start:		.long	bss_start
+._bss_end:		.long	bss_end
+._gd_init:		.long	(_sh_start - GENERATED_GBL_DATA_SIZE)
+._stack_init:	.long	(_sh_start - GENERATED_GBL_DATA_SIZE - CONFIG_SYS_MALLOC_LEN - 16)
+#._sh_generic_init:	.long	sh_generic_init

u-boot/arch/sh/cpu/sh3/watchdog.c

@@ -0,0 +1,27 @@
+/*
+ * (C) Copyright 2010
+ * Nobuhiro Iwamatsu <nobuhiro.iwamatsu.yj@renesas.com>
+ *
+ * (C) Copyright 2007
+ * Yoshihiro Shimoda <shimoda.yoshihiro@renesas.com>
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#include <common.h>
+#include <asm/processor.h>
+#include <asm/system.h>
+
+int watchdog_init(void)
+{
+	return 0;
+}
+
+void reset_cpu(unsigned long ignored)
+{
+	/* Address error with SR.BL=1 first. */
+	trigger_address_error();
+
+	while (1)
+		;
+}