first commit

.gitignore

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+bsd-ce
+nk.bin
+nk-dump
+u-boot.bin

Makefile

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+all:	bsd-ce nk-dump
+
+bsd-ce:	bsd-ce.c
+	$(CC) -o bsd-ce bsd-ce.c
+
+nk-dump: nk-dump.c
+	$(CC) -o nk-dump nk-dump.c
+
+clean:
+	rm -f bsd-ce nk-dump

README

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+This is a nk.bin maker which contains U-Boot
+Based on bsd-ce(https://rink.nu/projects/bsd-ce.html)
+
+動作原理:
+SHARP BrainはOSとしてWindows CE 6.0を搭載している
+Brainに搭載されているWindows CE用のブートローダー(EBOOT)はSDカードから所定の名前のOSイメージを読み込み
+仮想アドレス0xA0200000(物理アドレス0x40200000)へとジャンプする
+ここでBSDカーネルをWindows CEのブートローダーから起動するためのnk.binを生成するプログラムを流用し
+0xA0200000へU-Bootを読み込むようにパックしたnk.binを生成するのが本プログラムである

bsd-ce.c

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+#include <sys/types.h>
+#include <fcntl.h>
+#include <unistd.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <stdint.h>
+
+char*	outfile    = "nk.bin";
+int	verbose = 0;
+FILE*	fout = NULL;
+FILE*	kfile = NULL;
+FILE* lfile = NULL;
+char* loader = NULL;
+unsigned int loader_size = 0;
+
+#define WRITE(arg,size) \
+	if(!fwrite(arg, size, 1, fout)) \
+		errx(1,"fwrite");
+
+unsigned char  magic[7] = "B000FF\n";
+unsigned int start = 0xa0200000;
+unsigned int len   = 0;
+
+void
+usage(){
+	fprintf(stderr, "usage: bsd-ce [-h] [-o outfile] u-boot.bin\n");
+	fprintf(stderr, "\n");
+	fprintf(stderr, "    -h                 this help\n");
+	fprintf(stderr, "    -o outfile         write output to [outfile]\n");
+	fprintf(stderr, "                       default: %s\n", outfile);
+}
+
+int
+main(int argc, char* argv[]){
+	int n, i;
+	unsigned int i32, cksum, ch;
+	long len;
+	
+	while((i = getopt(argc, argv, "hvo:l:")) != -1) {
+		switch(i) {
+			case 'o':
+				outfile = optarg;
+				break;
+			case 'h':
+			default:
+				usage();
+				return 1;
+		}
+	}
+	argc -= optind; argv += optind;
+	if (argc != 1) {
+		fprintf(stderr, "missing kernel name\n");
+		usage();
+		return 1;
+	}
+
+
+	/* load the loader (err...) */
+	if ((lfile = fopen(argv[0], "rb")) == NULL)
+		errx(1, "unable to open '%s'", argv[0]);
+	fseek(lfile, 0, SEEK_END);
+	loader_size = ftell(lfile);
+	fseek(lfile, 0, SEEK_SET);
+	if ((loader = (char*)malloc(loader_size)) == NULL)
+		errx(1, "can't allocate %u bytes for loader", loader_size);
+	if (!fread(loader, loader_size, 1, lfile))
+		errx(1, "can't read loader file");
+	fclose(lfile);
+	
+	// next, try to create the output file
+	if ((fout = fopen(outfile, "wb")) == NULL)
+		errx(1, "unable to create '%s'", outfile);
+
+	/*
+   * Write NK.BIN header - this is a magic identifier, the first address
+	 * data is stored, and the total length
+	 */
+	WRITE(magic,  sizeof(magic));
+	WRITE(&start, sizeof(start));
+	WRITE(&loader_size,  sizeof(loader_size));
+
+
+	/* Calculate the loader checksum */
+	cksum = 0;
+	for (len = 0; len < loader_size; len++) {
+		ch = (unsigned char)loader[len]; cksum += ch;
+	}
+	i32 = start;
+	WRITE(&i32, sizeof(unsigned int));
+	
+	i32 = loader_size;
+	WRITE(&i32, sizeof(unsigned int));
+	
+	i32 = cksum;
+	WRITE(&i32, sizeof(unsigned int));
+
+	/* Put the loader in place */
+	for (len = 0; len < loader_size; len++) {
+		putc(loader[len], fout);
+	}
+
+	/*
+   * Write NK.BIN footer - this is just a series of 3x uint32_t indicating
+	 * a file of zero length, starting at our init code.
+	 */
+	i32 = 0;       WRITE(&i32, sizeof(i32));
+	i32 = start;   WRITE(&i32, sizeof(i32));
+	i32 = 0;       WRITE(&i32, sizeof(i32));
+
+	free(loader);
+	fclose(fout);
+	return 0;
+}

nk-dump.c

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+#include <sys/types.h>
+#include <fcntl.h>
+#include <gelf.h>
+#include <unistd.h>
+#include <stdio.h>
+#include <stdlib.h>
+
+uint8_t  magic[7] = "B000FF\n";
+
+#define READ(buf,len) \
+	if (!fread(buf,len,1,f)) \
+		err(1, "read error");
+
+int
+main(int argc, char* argv[])
+{
+	FILE* f;
+	uint8_t marker[7];
+	uint32_t i32, addr, cksum, len, i;
+	int n, ch, c;
+
+	if (argc != 2) {
+		fprintf(stderr,"usage: nk-dump filename\n");
+		return 1;
+	}
+
+	if ((f = fopen(argv[1], "rb")) == NULL)
+		err(1, "can't open %s", argv[1]);
+
+	READ(marker, sizeof(marker));
+	if (memcmp(magic, marker, sizeof(magic)))
+		errx(1, "signature does not match");
+	READ(&i32, sizeof(i32));
+	printf("addr      %08x\n", i32);
+	READ(&i32, sizeof(i32));
+	printf("length    %08x\n", i32);
+	n = 0;
+	while (!feof(f)) {
+		READ(&addr,  sizeof(addr));
+		READ(&len,   sizeof(len));
+		READ(&cksum, sizeof(cksum));
+
+		printf("image %u\n", n);
+		c = 0;
+		for (i = 0; i < len; i++) {
+			ch = getc(f); c += ch;
+		}
+		printf("  addr      %08x\n", addr);
+		printf("  len       %08x\n", len);
+		printf("  cksum     %08x", cksum);
+		if (cksum == c) {
+			printf(" [ok]\n");
+		} else {
+			printf(" != calculated cksum %08x\n", c);
+		}
+
+		n++;
+		
+	}
+	fclose(f);
+
+	return 0;
+}
+
+/* vim:set ts=2 sw=2: */