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/bootm.c

@@ -0,0 +1,111 @@
+/*
+ * (C) Copyright 2003
+ * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
+ *
+ * (c) Copyright 2008 Nobuhiro Iwamatsu <iwamatsu.nobuhiro@renesas.com>
+ * (c) Copyright 2008 Renesas Solutions Corp.
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#include <common.h>
+#include <command.h>
+#include <asm/byteorder.h>
+#include <asm/zimage.h>
+
+#ifdef CONFIG_SYS_DEBUG
+static void hexdump(unsigned char *buf, int len)
+{
+	int i;
+
+	for (i = 0; i < len; i++) {
+		if ((i % 16) == 0)
+			printf("%s%08x: ", i ? "\n" : "",
+							(unsigned int)&buf[i]);
+		printf("%02x ", buf[i]);
+	}
+	printf("\n");
+}
+#endif
+
+#ifdef CONFIG_SH_SDRAM_OFFSET
+#define GET_INITRD_START(initrd, linux) (initrd - linux + CONFIG_SH_SDRAM_OFFSET)
+#else
+#define GET_INITRD_START(initrd, linux) (initrd - linux)
+#endif
+
+static void set_sh_linux_param(unsigned long param_addr, unsigned long data)
+{
+	*(unsigned long *)(param_addr) = data;
+}
+
+static unsigned long sh_check_cmd_arg(char *cmdline, char *key, int base)
+{
+	unsigned long val = 0;
+	char *p = strstr(cmdline, key);
+	if (p) {
+		p += strlen(key);
+		val = simple_strtol(p, NULL, base);
+	}
+	return val;
+}
+
+int do_bootm_linux(int flag, int argc, char * const argv[], bootm_headers_t *images)
+{
+	/* Linux kernel load address */
+	void (*kernel) (void) = (void (*)(void))images->ep;
+	/* empty_zero_page */
+	unsigned char *param
+		= (unsigned char *)image_get_load(images->legacy_hdr_os);
+	/* Linux kernel command line */
+	char *cmdline = (char *)param + COMMAND_LINE;
+	/* PAGE_SIZE */
+	unsigned long size = images->ep - (unsigned long)param;
+	char *bootargs = getenv("bootargs");
+
+	/*
+	 * allow the PREP bootm subcommand, it is required for bootm to work
+	 */
+	if (flag & BOOTM_STATE_OS_PREP)
+		return 0;
+
+	if ((flag != 0) && (flag != BOOTM_STATE_OS_GO))
+		return 1;
+
+	/* Clear zero page */
+	memset(param, 0, size);
+
+	/* Set commandline */
+	strcpy(cmdline, bootargs);
+
+	/* Initrd */
+	if (images->rd_start || images->rd_end) {
+		unsigned long ramdisk_flags = 0;
+		int val = sh_check_cmd_arg(bootargs, CMD_ARG_RD_PROMPT, 10);
+		if (val == 1)
+				ramdisk_flags |= RD_PROMPT;
+		else
+				ramdisk_flags &= ~RD_PROMPT;
+
+		val = sh_check_cmd_arg(bootargs, CMD_ARG_RD_DOLOAD, 10);
+		if (val == 1)
+				ramdisk_flags |= RD_DOLOAD;
+		else
+				ramdisk_flags &= ~RD_DOLOAD;
+
+		set_sh_linux_param((unsigned long)param + MOUNT_ROOT_RDONLY, 0x0001);
+		set_sh_linux_param((unsigned long)param + RAMDISK_FLAGS, ramdisk_flags);
+		set_sh_linux_param((unsigned long)param + ORIG_ROOT_DEV, 0x0200);
+		set_sh_linux_param((unsigned long)param + LOADER_TYPE, 0x0001);
+		set_sh_linux_param((unsigned long)param + INITRD_START,
+			GET_INITRD_START(images->rd_start, CONFIG_SYS_SDRAM_BASE));
+		set_sh_linux_param((unsigned long)param + INITRD_SIZE,
+			images->rd_end - images->rd_start);
+	}
+
+	/* Boot kernel */
+	kernel();
+
+	/* does not return */
+	return 1;
+}