move target/utils to tools/firmware-utils

SVN-Revision: 5702

5 files changed, 1297 insertions, 0 deletions

diff --git a/tools/firmware-utils/src/addpattern.c b/tools/firmware-utils/src/addpattern.c
new file mode 100644
index 0000000000..5f49b921f6
--- /dev/null
+++ b/tools/firmware-utils/src/addpattern.c
@@ -0,0 +1,235 @@
+/*
+ * Copyright (C) 2004  Manuel Novoa III  <mjn3@codepoet.org>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ */
+
+/* July 29, 2004
+ *
+ * This is a hacked replacement for the 'addpattern' utility used to
+ * create wrt54g .bin firmware files.  It isn't pretty, but it does
+ * the job for me.
+ *
+ * Extensions:
+ *  -v allows setting the version string on the command line.
+ *  -{0|1} sets the (currently ignored) hw_ver flag in the header
+ *      to 0 or 1 respectively.
+ */
+
+/* January 12, 2005
+ * 
+ * Modified by rodent at rodent dot za dot net
+ * Support added for the new WRT54G v2.2 and WRT54GS v1.1 "flags"
+ * Without the flags set to 0x7, the above units will refuse to flash.
+ * 
+ * Extensions:
+ *  -{0|1|2} sets {0|1} sets hw_ver flag to 0/1. {2} sets hw_ver to 1
+ *     and adds the new hardware "flags" for the v2.2/v1.1 units
+*/
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <time.h>
+#include <unistd.h>
+#include <sys/stat.h>
+
+/**********************************************************************/
+
+#define CODE_ID		"U2ND"		/* from code_pattern.h */
+#define CODE_PATTERN   "W54S"	/* from code_pattern.h */
+#define PBOT_PATTERN   "PBOT"
+
+#define CYBERTAN_VERSION	"v3.37.2" /* from cyutils.h */
+
+/* WRT54G v2.2 and WRT54GS v1.1 "flags" (from 3.37.32 firmware cyutils.h) */
+#define SUPPORT_4712_CHIP      0x0001
+#define SUPPORT_INTEL_FLASH    0x0002
+#define SUPPORT_5325E_SWITCH   0x0004
+
+struct code_header {			/* from cyutils.h */
+	char magic[4];
+	char res1[4];				/* for extra magic */
+	char fwdate[3];
+	char fwvern[3];
+	char id[4];					/* U2ND */
+	char hw_ver;    			/* 0: for 4702, 1: for 4712 -- new in 2.04.3 */
+	char unused;
+	unsigned char flags[2];       /* SUPPORT_ flags new for 3.37.2 (WRT54G v2.2 and WRT54GS v1.1) */
+	unsigned char res2[10];
+} ;
+
+/**********************************************************************/
+
+void usage(void) __attribute__ (( __noreturn__ ));
+
+void usage(void)
+{
+	fprintf(stderr, "Usage: addpattern [-i trxfile] [-o binfile] [-p pattern] [-g] [-b] [-v v#.#.#] [-{0|1|2|4}]\n");
+	exit(EXIT_FAILURE);
+}
+
+int main(int argc, char **argv)
+{
+	char buf[1024];	/* keep this at 1k or adjust garbage calc below */
+	struct code_header *hdr;
+	FILE *in = stdin;
+	FILE *out = stdout;
+	char *ifn = NULL;
+	char *ofn = NULL;
+	char *pattern = CODE_PATTERN;
+	char *pbotpat = PBOT_PATTERN;
+	char *version = CYBERTAN_VERSION;
+	int gflag = 0;
+	int pbotflag = 0;
+	int c;
+	int v0, v1, v2;
+	size_t off, n;
+	time_t t;
+	struct tm *ptm;
+
+	fprintf(stderr, "mjn3's addpattern replacement - v0.81\n");
+
+	hdr = (struct code_header *) buf;
+	memset(hdr, 0, sizeof(struct code_header));
+
+	while ((c = getopt(argc, argv, "i:o:p:gbv:0124")) != -1) {
+		switch (c) {
+			case 'i':
+				ifn = optarg;
+				break;
+			case 'o':
+				ofn = optarg;
+				break;
+			case 'p':
+				pattern = optarg;
+				break;
+			case 'g':
+				gflag = 1;
+				break;
+			case 'b':
+				pbotflag = 1;
+				break;
+			case 'v':			/* extension to allow setting version */
+				version = optarg;
+				break;
+			case '0':
+				hdr->hw_ver = 0;
+				break;
+			case '1':
+				hdr->hw_ver = 1;
+				break;
+			case '2': 			/* new 54G v2.2 and 54GS v1.1 flags */
+				hdr->hw_ver = 1;
+				hdr->flags[0] |= SUPPORT_4712_CHIP;
+				hdr->flags[0] |= SUPPORT_INTEL_FLASH;
+				hdr->flags[0] |= SUPPORT_5325E_SWITCH;
+				break;
+			case '4':
+				/* V4 firmware sets the flags to 0x1f */
+				hdr->hw_ver = 0;
+				hdr->flags[0] = 0x1f;
+				break;
+
+			default:
+				usage();
+		}
+	}
+
+	if (optind != argc) {
+		fprintf(stderr, "illegal arg \"%s\"\n", argv[optind]);
+		usage();
+	}
+
+	if (strlen(pattern) != 4) {
+		fprintf(stderr, "illegal pattern \"%s\": length != 4\n", pattern);
+		usage();
+	}
+
+	if (ifn && !(in = fopen(ifn, "r"))) {
+		fprintf(stderr, "can not open \"%s\" for reading\n", ifn);
+		usage();
+	}
+
+	if (ofn && !(out = fopen(ofn, "w"))) {
+		fprintf(stderr, "can not open \"%s\" for writing\n", ofn);
+		usage();
+	}
+
+	if (time(&t) == (time_t)(-1)) {
+		fprintf(stderr, "time call failed\n");
+		return EXIT_FAILURE;
+	}
+
+	ptm = localtime(&t);
+
+	if (3 != sscanf(version, "v%d.%d.%d", &v0, &v1, &v2)) {
+		fprintf(stderr, "bad version string \"%s\"\n", version);
+		return EXIT_FAILURE;
+	}
+
+	memcpy(&hdr->magic, pattern, 4);
+	if (pbotflag)
+		memcpy(&hdr->res1, pbotpat, 4);
+	hdr->fwdate[0] = ptm->tm_year % 100;
+	hdr->fwdate[1] = ptm->tm_mon + 1;
+	hdr->fwdate[2] = ptm->tm_mday;
+	hdr->fwvern[0] = v0;
+	hdr->fwvern[1] = v1;
+	hdr->fwvern[2] = v2;
+	memcpy(&hdr->id, CODE_ID, strlen(CODE_ID));
+
+	off = sizeof(struct code_header);
+
+	fprintf(stderr, "writing firmware v%d.%d.%d on %d/%d/%d (y/m/d)\n",
+			v0, v1, v2,
+			hdr->fwdate[0], hdr->fwdate[1], hdr->fwdate[2]);
+
+
+	while ((n = fread(buf + off, 1, sizeof(buf)-off, in) + off) > 0) {
+		off = 0;
+		if (n < sizeof(buf)) {
+			if (ferror(in)) {
+			FREAD_ERROR:
+				fprintf(stderr, "fread error\n");
+				return EXIT_FAILURE;
+			}
+			if (gflag) {
+				gflag = sizeof(buf) - n;
+				memset(buf + n, 0xff, gflag);
+				fprintf(stderr, "adding %d bytes of garbage\n", gflag);
+				n = sizeof(buf);
+			}
+		}
+		if (!fwrite(buf, n, 1, out)) {
+		FWRITE_ERROR:
+			fprintf(stderr, "fwrite error\n");
+			return EXIT_FAILURE;
+		}
+	}
+	
+	if (ferror(in)) {
+		goto FREAD_ERROR;
+	}
+
+	if (fflush(out)) {
+		goto FWRITE_ERROR;
+	}
+
+	fclose(in);
+	fclose(out);
+
+	return EXIT_SUCCESS;
+}
diff --git a/tools/firmware-utils/src/dgfirmware.c b/tools/firmware-utils/src/dgfirmware.c
new file mode 100644
index 0000000000..5ff3b69646
--- /dev/null
+++ b/tools/firmware-utils/src/dgfirmware.c
@@ -0,0 +1,376 @@
+#include <stdlib.h>
+#include <stdio.h>
+
+
+#define IMG_SIZE     0x3e0000
+
+#define KERNEL_START 0x020000
+#define KERNEL_SIZE  0x0b0000
+
+#define ROOTFS_START 0x0d0000
+#define ROOTFS_SIZE  0x30ffb2
+
+char* app_name;
+
+
+
+
+void print_usage(void)
+{
+  fprintf(stderr, "usage: dgfirmware [<opts>] <img>\n");
+  fprintf(stderr, "  <img>               firmware image filename\n");
+  fprintf(stderr, "  <opts>  -h          print this message\n");
+  fprintf(stderr, "          -f          fix the checksum\n");
+  fprintf(stderr, "          -x  <file>  extract the rootfs file to <file>\n");
+  fprintf(stderr, "          -xk <file>  extract the kernel to <file>\n");
+  fprintf(stderr, "          -m  <file>  merge in rootfs fil\e from <file>\n");
+  fprintf(stderr, "          -k  <file>  merge in kernel from <file>\n");
+  fprintf(stderr, "          -w  <file>  write back the modified firmware\n");
+}
+
+
+unsigned char* read_img(const char *fname)
+{
+  FILE *fp;
+  int size;
+  unsigned char *img;
+
+  fp = fopen(fname, "rb");
+  if (fp == NULL) {
+    perror(app_name);
+    exit(-1);
+  }
+
+  fseek(fp, 0, SEEK_END);
+  size = ftell(fp);
+  
+  if (size != IMG_SIZE) {
+    fprintf(stderr, "%s: image file has wrong size\n", app_name);
+    fclose(fp);
+    exit(-1);
+  }
+
+  rewind(fp);
+
+  img = malloc(IMG_SIZE);
+  if (img == NULL) {
+    perror(app_name);
+    fclose(fp);
+    exit(-1);
+  }
+
+  if (fread(img, 1, IMG_SIZE, fp) != IMG_SIZE) {
+    fprintf(stderr, "%s: can't read image file\n", app_name);
+    fclose(fp);
+    exit(-1);
+  }
+
+  fclose(fp);
+  return img;
+}
+
+
+void write_img(unsigned char* img, const char *fname)
+{
+  FILE *fp;
+
+  fp = fopen(fname, "wb");
+  if (fp == NULL) {
+    perror(app_name);
+    exit(-1);
+  }
+
+  if (fwrite(img, 1, IMG_SIZE, fp) != IMG_SIZE) {
+    fprintf(stderr, "%s: can't write image file\n", app_name);
+    fclose(fp);
+    exit(-1);
+  }
+}
+
+
+void write_rootfs(unsigned char* img, const char *fname)
+{
+  FILE *fp;
+
+  fp = fopen(fname, "wb");
+  if (fp == NULL) {
+    perror(app_name);
+    exit(-1);
+  }
+  
+  if (fwrite(img+ROOTFS_START, 1, ROOTFS_SIZE, fp) != ROOTFS_SIZE) {
+    fprintf(stderr, "%s: can't write image file\n", app_name);
+    fclose(fp);
+    exit(-1);
+  }
+}
+
+
+void write_kernel(unsigned char* img, const char *fname)
+{
+  FILE *fp;
+
+  fp = fopen(fname, "wb");
+  if (fp == NULL) {
+    perror(app_name);
+    exit(-1);
+  }
+  
+  if (fwrite(img+KERNEL_START, 1, KERNEL_SIZE, fp) != KERNEL_SIZE) {
+    fprintf(stderr, "%s: can't write kernel file\n", app_name);
+    fclose(fp);
+    exit(-1);
+  }
+}
+
+
+unsigned char* read_rootfs(unsigned char* img, const char *fname)
+{
+  FILE *fp;
+  int size;
+  int i;
+
+  for (i=ROOTFS_START; i<ROOTFS_START+ROOTFS_SIZE; i++)
+    img[i] = 0xff;
+
+  fp = fopen(fname, "rb");
+  if (fp == NULL) {
+    perror(app_name);
+    exit(-1);
+  }
+
+  fseek(fp, 0, SEEK_END);
+  size = ftell(fp);
+  
+  if (size > ROOTFS_SIZE) {
+    fprintf(stderr, "%s: rootfs image file is too big\n", app_name);
+    fclose(fp);
+    exit(-1);
+  }
+
+  rewind(fp);
+
+  if (fread(img+ROOTFS_START, 1, size, fp) != size) {
+    fprintf(stderr, "%s: can't read rootfs image file\n", app_name);
+    fclose(fp);
+    exit(-1);
+  }
+
+  fclose(fp);
+  return img;
+}
+
+
+unsigned char* read_kernel(unsigned char* img, const char *fname)
+{
+  FILE *fp;
+  int size;
+  int i;
+
+  for (i=KERNEL_START; i<KERNEL_START+KERNEL_SIZE; i++)
+    img[i] = 0xff;
+
+  fp = fopen(fname, "rb");
+  if (fp == NULL) {
+    perror(app_name);
+    exit(-1);
+  }
+
+  fseek(fp, 0, SEEK_END);
+  size = ftell(fp);
+  
+  if (size > KERNEL_SIZE) {
+    fprintf(stderr, "%s: kernel binary file is too big\n", app_name);
+    fclose(fp);
+    exit(-1);
+  }
+
+  rewind(fp);
+
+  if (fread(img+KERNEL_START, 1, size, fp) != size) {
+    fprintf(stderr, "%s: can't read kernel file\n", app_name);
+    fclose(fp);
+    exit(-1);
+  }
+
+  fclose(fp);
+  return img;
+}
+
+
+int get_checksum(unsigned char* img)
+{
+  short unsigned s;
+
+  s = img[0x3dfffc] + (img[0x3dfffd]<<8);
+
+  return s;
+}
+
+
+void set_checksum(unsigned char*img, unsigned short sum)
+{
+  img[0x3dfffc] = sum & 0xff;
+  img[0x3dfffd] = (sum>>8) & 0xff;
+}
+
+
+int compute_checksum(unsigned char* img)
+{
+  int i;
+  short s=0;
+
+  for (i=0; i<0x3dfffc; i++)
+    s += img[i];
+
+  return s;
+}
+
+
+int main(int argc, char* argv[])
+{
+  char *img_fname     = NULL;
+  char *rootfs_fname  = NULL;
+  char *kernel_fname  = NULL;
+  char *new_img_fname = NULL;
+
+  int do_fix_checksum = 0;
+  int do_write        = 0;
+  int do_write_rootfs = 0;
+  int do_read_rootfs  = 0;
+  int do_write_kernel = 0;
+  int do_read_kernel  = 0;
+
+  int i;
+  unsigned char *img;
+  unsigned short img_checksum;
+  unsigned short real_checksum;
+
+  app_name = argv[0];
+
+  for (i=1; i<argc; i++) {
+    if (!strcmp(argv[i], "-h")) {
+      print_usage();
+      return 0;
+    }
+    else if (!strcmp(argv[i], "-f")) {
+      do_fix_checksum = 1;
+    }
+    else if (!strcmp(argv[i], "-x")) {
+      if (i+1 >= argc) {
+	fprintf(stderr, "%s: missing argument\n", app_name);
+	return -1;
+      }
+      do_write_rootfs = 1;
+      rootfs_fname = argv[i+1];
+      i++;
+    }
+    else if (!strcmp(argv[i], "-xk")) {
+      if (i+1 >= argc) {
+	fprintf(stderr, "%s: missing argument\n", app_name);
+	return -1;
+      }
+      do_write_kernel = 1;
+      kernel_fname = argv[i+1];
+      i++;
+    }
+    else if (!strcmp(argv[i], "-m")) {
+      if (i+1 >= argc) {
+	fprintf(stderr, "%s: missing argument\n", app_name);
+	return -1;
+      }
+      do_read_rootfs = 1;
+      rootfs_fname = argv[i+1];
+      i++;
+    }
+    else if (!strcmp(argv[i], "-k")) {
+      if (i+1 >= argc) {
+	fprintf(stderr, "%s: missing argument\n", app_name);
+	return -1;
+      }
+      do_read_kernel = 1;
+      kernel_fname = argv[i+1];
+      i++;
+    }
+    else if (!strcmp(argv[i], "-w")) {
+      if (i+1 >= argc) {
+	fprintf(stderr, "%s: missing argument\n", app_name);
+	return -1;
+      }
+      do_write = 1;
+      new_img_fname = argv[i+1];
+      i++;
+    }
+    else if (img_fname != 0) {
+      fprintf(stderr, "%s: too many arguments\n", app_name);
+      return -1;
+    }
+    else {
+      img_fname = argv[i];
+    }
+  }
+
+  if (img_fname == NULL) {
+    fprintf(stderr, "%s: missing argument\n", app_name);
+    return -1;
+  }
+
+  if ((do_read_rootfs && do_write_rootfs) ||
+      (do_read_kernel && do_write_kernel)) {
+    fprintf(stderr, "%s: conflictuous options\n", app_name);
+    return -1;
+  }
+
+  printf ("** Read firmware file\n");
+  img = read_img(img_fname);
+
+  printf ("Firmware product: %s\n", img+0x3dffbd);
+  printf ("Firmware version: 1.%02d.%02d\n", (img[0x3dffeb] & 0x7f), img[0x3dffec]);
+
+  if (do_write_rootfs) {
+    printf ("** Write rootfs file\n");
+    write_rootfs(img, rootfs_fname);
+  }
+
+  if (do_write_kernel) {
+    printf ("** Write kernel file\n");
+    write_kernel(img, kernel_fname);
+  }
+
+  if (do_read_rootfs) {
+    printf ("** Read rootfs file\n");
+    read_rootfs(img, rootfs_fname);
+    do_fix_checksum = 1;
+  }
+
+  if (do_read_kernel) {
+    printf ("** Read kernel file\n");
+    read_kernel(img, kernel_fname);
+    do_fix_checksum = 1;
+  }
+
+  img_checksum = get_checksum(img);
+  real_checksum = compute_checksum(img);
+  
+  printf ("image checksum = %04x\n", img_checksum);
+  printf ("real checksum  = %04x\n", real_checksum);
+
+  if (do_fix_checksum) {
+    if (img_checksum != real_checksum) {
+      printf ("** Bad Checksum, fix it\n");
+      set_checksum(img, real_checksum);
+    }
+    else {
+      printf ("** Checksum is correct, good\n");
+    }
+  }
+
+  if (do_write) {
+    printf ("** Write image file\n");
+    write_img(img, new_img_fname);
+  }
+
+  free(img);
+  return 0;
+}
+
diff --git a/tools/firmware-utils/src/motorola-bin.c b/tools/firmware-utils/src/motorola-bin.c
new file mode 100644
index 0000000000..acf856dde6
--- /dev/null
+++ b/tools/firmware-utils/src/motorola-bin.c
@@ -0,0 +1,146 @@
+/*
+ * motorola-bin.c
+ *
+ * Copyright (C) 2005-2006 Mike Baker,
+ *                         Imre Kaloz <kaloz@openwrt.org>
+ *                         OpenWrt.org
+ *
+ * $Id$
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
+ *
+ */
+
+/*
+ * February 1, 2006
+ *
+ * Add support for for creating WA840G and WE800G images
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <fcntl.h>
+#include <sys/mman.h>
+#include <string.h>
+#include <netinet/in.h>
+
+unsigned long *crc32;
+
+void init_crc32()
+{
+    unsigned long crc;
+    unsigned long poly = ntohl(0x2083b8ed);
+    int n, bit;
+    if ((crc32 = (unsigned long *) malloc(256 * sizeof(unsigned long))) == (void *)-1) {
+       perror("malloc");
+       exit(1);
+    }
+    for (n = 0; n < 256; n++) {
+        crc = (unsigned long) n;
+        for (bit = 0; bit < 8; bit++)
+            crc = (crc & 1) ? (poly ^ (crc >> 1)) : (crc >> 1);
+        crc32[n] = crc;
+    }
+}
+
+unsigned int crc32buf(char *buf, size_t len)
+{
+    unsigned int crc = 0xFFFFFFFF;
+    for (; len; len--, buf++)
+        crc = crc32[(crc ^ *buf) & 0xff] ^ (crc >> 8);
+    return crc;
+}
+
+struct motorola {
+	unsigned int crc;	// crc32 of the remainder
+	unsigned int flags;	// unknown, 105770*
+	char *trx;		// standard trx
+};
+
+void usage(void) __attribute__ (( __noreturn__ ));
+
+void usage(void)
+{
+	printf("Usage: motorola-bin [-device] [trxfile] [binfile]\n\n");
+	printf("Known devices: 1 - WR850G | 2 - WA840G | 3 - WE800G\n");
+	exit(1);
+}
+
+int main(int argc, char **argv)
+{
+	unsigned int len;
+	int fd;
+	int c;
+	void *trx;
+	struct motorola *firmware;
+
+	// verify parameters
+
+	if (argc!=4)
+	{
+	usage();
+	}
+
+	// mmap trx file
+	if (((fd = open(argv[2], O_RDONLY))  < 0)
+	|| ((len = lseek(fd, 0, SEEK_END)) < 0)
+	|| ((trx = mmap(0, len, PROT_READ, MAP_SHARED, fd, 0)) == (void *) (-1))
+	|| (close(fd) < 0)) {
+		perror("open/malloc");
+		exit(1);
+	}
+	
+	// create a firmware image in memory
+	// and copy the trx to it
+	firmware = malloc(len+8);
+	memcpy(&firmware->trx,trx,len);
+	munmap(trx,len);
+
+	// setup the motorola headers
+	init_crc32();
+
+	// setup the firmware magic
+
+	while ((c = getopt(argc, argv, "123")) !=-1) {
+		switch (c) {
+			case '1':
+				firmware->flags = ntohl(0x10577050); // Motorola WR850G
+				break;
+			case '2':
+				firmware->flags = ntohl(0x10577040); // Motorola WA840G
+				break;
+			case '3':
+				firmware->flags = ntohl(0x10577000); // Motorola WE800G
+				break;
+			default:
+				usage();
+		}
+	}
+
+	firmware->crc   = htonl(crc32buf((char *)&firmware->flags,len+4));
+
+	// write the firmware
+	if (((fd = open(argv[3], O_CREAT|O_WRONLY,0644)) < 0)
+	|| (write(fd,firmware,len+8) != len+8)
+	|| (close(fd) < 0)) {
+		perror("write");
+		exit(-1);
+	}
+
+	free(firmware);
+
+	return 0;
+}
diff --git a/tools/firmware-utils/src/trx.c b/tools/firmware-utils/src/trx.c
new file mode 100644
index 0000000000..787ffa8946
--- /dev/null
+++ b/tools/firmware-utils/src/trx.c
@@ -0,0 +1,354 @@
+/*
+ * Copyright (C) 2004  Manuel Novoa III  <mjn3@codepoet.org>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ */
+
+/* July 29, 2004
+ *
+ * This is a hacked replacement for the 'trx' utility used to create
+ * wrt54g .trx firmware files.  It isn't pretty, but it does the job
+ * for me.
+ *
+ * As an extension, you can specify a larger maximum length for the
+ * .trx file using '-m'.  It will be rounded up to be a multiple of 4K.
+ * NOTE: This space will be malloc()'d.
+ *
+ * August 16, 2004
+ *
+ * Sigh... Make it endian-neutral.
+ *
+ * TODO: Support '-b' option to specify offsets for each file.
+ *
+ * February 19, 2005 - mbm
+ *
+ * Add -a (align offset) and -b (absolute offset)
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <stddef.h>
+#include <stdint.h>
+#include <string.h>
+#include <errno.h>
+#include <unistd.h>
+
+#if __BYTE_ORDER == __BIG_ENDIAN
+#define STORE32_LE(X)		bswap_32(X)
+#elif __BYTE_ORDER == __LITTLE_ENDIAN
+#define STORE32_LE(X)		(X)
+#else
+#error unkown endianness!
+#endif
+
+uint32_t crc32buf(char *buf, size_t len);
+
+/**********************************************************************/
+/* from trxhdr.h */
+
+#define TRX_MAGIC	0x30524448	/* "HDR0" */
+#define TRX_VERSION	1
+#define TRX_MAX_LEN	0x5A0000
+#define TRX_NO_HEADER	1		/* Do not write TRX header */	
+
+struct trx_header {
+	uint32_t magic;			/* "HDR0" */
+	uint32_t len;			/* Length of file including header */
+	uint32_t crc32;			/* 32-bit CRC from flag_version to end of file */
+	uint32_t flag_version;	/* 0:15 flags, 16:31 version */
+	uint32_t offsets[3];	/* Offsets of partitions from start of header */
+};
+
+/**********************************************************************/
+
+void usage(void) __attribute__ (( __noreturn__ ));
+
+void usage(void)
+{
+	fprintf(stderr, "Usage: trx [-o outfile] [-m maxlen] [-a align] [-b offset] [-f file] [-f file [-f file]]\n");
+	exit(EXIT_FAILURE);
+}
+
+int main(int argc, char **argv)
+{
+	FILE *out = stdout;
+	FILE *in;
+	char *ofn = NULL;
+	char *buf;
+	char *e;
+	int c, i;
+	size_t n;
+	uint32_t cur_len;
+	unsigned long maxlen = TRX_MAX_LEN;
+	struct trx_header *p;
+
+	fprintf(stderr, "mjn3's trx replacement - v0.81.1\n");
+
+	if (!(buf = malloc(maxlen))) {
+		fprintf(stderr, "malloc failed\n");
+		return EXIT_FAILURE;
+	}
+
+	p = (struct trx_header *) buf;
+
+	p->magic = STORE32_LE(TRX_MAGIC);
+	cur_len = sizeof(struct trx_header);
+	p->flag_version = STORE32_LE((TRX_VERSION << 16));
+
+	in = NULL;
+	i = 0;
+
+	while ((c = getopt(argc, argv, "-:o:m:a:b:f:")) != -1) {
+		switch (c) {
+			case 'f':
+			case 1:
+				p->offsets[i++] = STORE32_LE(cur_len);
+
+				if (!(in = fopen(optarg, "r"))) {
+					fprintf(stderr, "can not open \"%s\" for reading\n", optarg);
+					usage();
+				}
+				n = fread(buf + cur_len, 1, maxlen - cur_len, in);
+				if (!feof(in)) {
+					fprintf(stderr, "fread failure or file \"%s\" too large\n",optarg);
+					fclose(in);
+					return EXIT_FAILURE;
+				}
+				fclose(in);
+#undef  ROUND
+#define ROUND 4
+				if (n & (ROUND-1)) {
+					memset(buf + cur_len + n, 0, ROUND - (n & (ROUND-1)));
+					n += ROUND - (n & (ROUND-1));
+				}
+				cur_len += n;
+
+				break;
+			case 'o':
+				ofn = optarg;
+				if (ofn && !(out = fopen(ofn, "w"))) {
+					fprintf(stderr, "can not open \"%s\" for writing\n", ofn);
+					usage();
+				}
+
+				break;
+			case 'm':
+				errno = 0;
+				maxlen = strtoul(optarg, &e, 0);
+				if (errno || (e == optarg) || *e) {
+					fprintf(stderr, "illegal numeric string\n");
+					usage();
+				}
+#undef  ROUND
+#define ROUND 0x1000
+				if (maxlen & (ROUND-1)) {
+					maxlen += (ROUND - (maxlen & (ROUND-1)));
+				}
+				if (maxlen < ROUND) {
+					fprintf(stderr, "maxlen too small (or wrapped)\n");
+					usage();
+				}
+				if (maxlen > TRX_MAX_LEN) {
+					fprintf(stderr, "WARNING: maxlen exceeds default maximum!  Beware of overwriting nvram!\n");
+				}
+				if (!(buf = realloc(buf,maxlen))) {
+					fprintf(stderr, "realloc failed");
+					return EXIT_FAILURE;
+				}
+				break;
+			case 'a':
+				errno = 0;
+				n = strtoul(optarg, &e, 0);
+				if (errno || (e == optarg) || *e) {
+					fprintf(stderr, "illegal numeric string\n");
+					usage();
+				}
+				if (cur_len & (n-1)) {
+					n = n - (cur_len & (n-1));
+					memset(buf + cur_len, 0, n);
+					cur_len += n;
+				}
+				break;
+			case 'b':
+				errno = 0;
+				n = strtoul(optarg, &e, 0);
+				if (errno || (e == optarg) || *e) {
+					fprintf(stderr, "illegal numeric string\n");
+					usage();
+				}
+				if (n < cur_len) {
+					fprintf(stderr, "WARNING: current length exceeds -b %d offset\n",n);
+				} else {
+					memset(buf + cur_len, 0, n - cur_len);
+					cur_len = n;
+				}
+				break;
+			default:
+				usage();
+		}
+	}
+
+	if (!in) {
+		fprintf(stderr, "we require atleast one filename\n");
+		usage();
+	}
+
+#undef  ROUND
+#define ROUND 0x1000
+	n = cur_len & (ROUND-1);
+	if (n) {
+		memset(buf + cur_len, 0, ROUND - n);
+		cur_len += ROUND - n;
+	}
+
+	p->crc32 = crc32buf((char *) &p->flag_version,
+						cur_len - offsetof(struct trx_header, flag_version));
+	p->crc32 = STORE32_LE(p->crc32);
+
+	p->len = STORE32_LE(cur_len);
+
+	if (!fwrite(buf, cur_len, 1, out) || fflush(out)) {
+		fprintf(stderr, "fwrite failed\n");
+		return EXIT_FAILURE;
+	}
+
+	fclose(out);
+
+	return EXIT_SUCCESS;
+}
+
+/**********************************************************************/
+/* The following was grabbed and tweaked from the old snippets collection
+ * of public domain C code. */
+
+/**********************************************************************\
+|* Demonstration program to compute the 32-bit CRC used as the frame  *|
+|* check sequence in ADCCP (ANSI X3.66, also known as FIPS PUB 71     *|
+|* and FED-STD-1003, the U.S. versions of CCITT's X.25 link-level     *|
+|* protocol).  The 32-bit FCS was added via the Federal Register,     *|
+|* 1 June 1982, p.23798.  I presume but don't know for certain that   *|
+|* this polynomial is or will be included in CCITT V.41, which        *|
+|* defines the 16-bit CRC (often called CRC-CCITT) polynomial.  FIPS  *|
+|* PUB 78 says that the 32-bit FCS reduces otherwise undetected       *|
+|* errors by a factor of 10^-5 over 16-bit FCS.                       *|
+\**********************************************************************/
+
+/* Copyright (C) 1986 Gary S. Brown.  You may use this program, or
+   code or tables extracted from it, as desired without restriction.*/
+
+/* First, the polynomial itself and its table of feedback terms.  The  */
+/* polynomial is                                                       */
+/* X^32+X^26+X^23+X^22+X^16+X^12+X^11+X^10+X^8+X^7+X^5+X^4+X^2+X^1+X^0 */
+/* Note that we take it "backwards" and put the highest-order term in  */
+/* the lowest-order bit.  The X^32 term is "implied"; the LSB is the   */
+/* X^31 term, etc.  The X^0 term (usually shown as "+1") results in    */
+/* the MSB being 1.                                                    */
+
+/* Note that the usual hardware shift register implementation, which   */
+/* is what we're using (we're merely optimizing it by doing eight-bit  */
+/* chunks at a time) shifts bits into the lowest-order term.  In our   */
+/* implementation, that means shifting towards the right.  Why do we   */
+/* do it this way?  Because the calculated CRC must be transmitted in  */
+/* order from highest-order term to lowest-order term.  UARTs transmit */
+/* characters in order from LSB to MSB.  By storing the CRC this way,  */
+/* we hand it to the UART in the order low-byte to high-byte; the UART */
+/* sends each low-bit to hight-bit; and the result is transmission bit */
+/* by bit from highest- to lowest-order term without requiring any bit */
+/* shuffling on our part.  Reception works similarly.                  */
+
+/* The feedback terms table consists of 256, 32-bit entries.  Notes:   */
+/*                                                                     */
+/*  1. The table can be generated at runtime if desired; code to do so */
+/*     is shown later.  It might not be obvious, but the feedback      */
+/*     terms simply represent the results of eight shift/xor opera-    */
+/*     tions for all combinations of data and CRC register values.     */
+/*                                                                     */
+/*  2. The CRC accumulation logic is the same for all CRC polynomials, */
+/*     be they sixteen or thirty-two bits wide.  You simply choose the */
+/*     appropriate table.  Alternatively, because the table can be     */
+/*     generated at runtime, you can start by generating the table for */
+/*     the polynomial in question and use exactly the same "updcrc",   */
+/*     if your application needn't simultaneously handle two CRC       */
+/*     polynomials.  (Note, however, that XMODEM is strange.)          */
+/*                                                                     */
+/*  3. For 16-bit CRCs, the table entries need be only 16 bits wide;   */
+/*     of course, 32-bit entries work OK if the high 16 bits are zero. */
+/*                                                                     */
+/*  4. The values must be right-shifted by eight bits by the "updcrc"  */
+/*     logic; the shift must be unsigned (bring in zeroes).  On some   */
+/*     hardware you could probably optimize the shift in assembler by  */
+/*     using byte-swap instructions.                                   */
+
+static const uint32_t crc_32_tab[] = { /* CRC polynomial 0xedb88320 */
+0x00000000, 0x77073096, 0xee0e612c, 0x990951ba, 0x076dc419, 0x706af48f,
+0xe963a535, 0x9e6495a3, 0x0edb8832, 0x79dcb8a4, 0xe0d5e91e, 0x97d2d988,
+0x09b64c2b, 0x7eb17cbd, 0xe7b82d07, 0x90bf1d91, 0x1db71064, 0x6ab020f2,
+0xf3b97148, 0x84be41de, 0x1adad47d, 0x6ddde4eb, 0xf4d4b551, 0x83d385c7,
+0x136c9856, 0x646ba8c0, 0xfd62f97a, 0x8a65c9ec, 0x14015c4f, 0x63066cd9,
+0xfa0f3d63, 0x8d080df5, 0x3b6e20c8, 0x4c69105e, 0xd56041e4, 0xa2677172,
+0x3c03e4d1, 0x4b04d447, 0xd20d85fd, 0xa50ab56b, 0x35b5a8fa, 0x42b2986c,
+0xdbbbc9d6, 0xacbcf940, 0x32d86ce3, 0x45df5c75, 0xdcd60dcf, 0xabd13d59,
+0x26d930ac, 0x51de003a, 0xc8d75180, 0xbfd06116, 0x21b4f4b5, 0x56b3c423,
+0xcfba9599, 0xb8bda50f, 0x2802b89e, 0x5f058808, 0xc60cd9b2, 0xb10be924,
+0x2f6f7c87, 0x58684c11, 0xc1611dab, 0xb6662d3d, 0x76dc4190, 0x01db7106,
+0x98d220bc, 0xefd5102a, 0x71b18589, 0x06b6b51f, 0x9fbfe4a5, 0xe8b8d433,
+0x7807c9a2, 0x0f00f934, 0x9609a88e, 0xe10e9818, 0x7f6a0dbb, 0x086d3d2d,
+0x91646c97, 0xe6635c01, 0x6b6b51f4, 0x1c6c6162, 0x856530d8, 0xf262004e,
+0x6c0695ed, 0x1b01a57b, 0x8208f4c1, 0xf50fc457, 0x65b0d9c6, 0x12b7e950,
+0x8bbeb8ea, 0xfcb9887c, 0x62dd1ddf, 0x15da2d49, 0x8cd37cf3, 0xfbd44c65,
+0x4db26158, 0x3ab551ce, 0xa3bc0074, 0xd4bb30e2, 0x4adfa541, 0x3dd895d7,
+0xa4d1c46d, 0xd3d6f4fb, 0x4369e96a, 0x346ed9fc, 0xad678846, 0xda60b8d0,
+0x44042d73, 0x33031de5, 0xaa0a4c5f, 0xdd0d7cc9, 0x5005713c, 0x270241aa,
+0xbe0b1010, 0xc90c2086, 0x5768b525, 0x206f85b3, 0xb966d409, 0xce61e49f,
+0x5edef90e, 0x29d9c998, 0xb0d09822, 0xc7d7a8b4, 0x59b33d17, 0x2eb40d81,
+0xb7bd5c3b, 0xc0ba6cad, 0xedb88320, 0x9abfb3b6, 0x03b6e20c, 0x74b1d29a,
+0xead54739, 0x9dd277af, 0x04db2615, 0x73dc1683, 0xe3630b12, 0x94643b84,
+0x0d6d6a3e, 0x7a6a5aa8, 0xe40ecf0b, 0x9309ff9d, 0x0a00ae27, 0x7d079eb1,
+0xf00f9344, 0x8708a3d2, 0x1e01f268, 0x6906c2fe, 0xf762575d, 0x806567cb,
+0x196c3671, 0x6e6b06e7, 0xfed41b76, 0x89d32be0, 0x10da7a5a, 0x67dd4acc,
+0xf9b9df6f, 0x8ebeeff9, 0x17b7be43, 0x60b08ed5, 0xd6d6a3e8, 0xa1d1937e,
+0x38d8c2c4, 0x4fdff252, 0xd1bb67f1, 0xa6bc5767, 0x3fb506dd, 0x48b2364b,
+0xd80d2bda, 0xaf0a1b4c, 0x36034af6, 0x41047a60, 0xdf60efc3, 0xa867df55,
+0x316e8eef, 0x4669be79, 0xcb61b38c, 0xbc66831a, 0x256fd2a0, 0x5268e236,
+0xcc0c7795, 0xbb0b4703, 0x220216b9, 0x5505262f, 0xc5ba3bbe, 0xb2bd0b28,
+0x2bb45a92, 0x5cb36a04, 0xc2d7ffa7, 0xb5d0cf31, 0x2cd99e8b, 0x5bdeae1d,
+0x9b64c2b0, 0xec63f226, 0x756aa39c, 0x026d930a, 0x9c0906a9, 0xeb0e363f,
+0x72076785, 0x05005713, 0x95bf4a82, 0xe2b87a14, 0x7bb12bae, 0x0cb61b38,
+0x92d28e9b, 0xe5d5be0d, 0x7cdcefb7, 0x0bdbdf21, 0x86d3d2d4, 0xf1d4e242,
+0x68ddb3f8, 0x1fda836e, 0x81be16cd, 0xf6b9265b, 0x6fb077e1, 0x18b74777,
+0x88085ae6, 0xff0f6a70, 0x66063bca, 0x11010b5c, 0x8f659eff, 0xf862ae69,
+0x616bffd3, 0x166ccf45, 0xa00ae278, 0xd70dd2ee, 0x4e048354, 0x3903b3c2,
+0xa7672661, 0xd06016f7, 0x4969474d, 0x3e6e77db, 0xaed16a4a, 0xd9d65adc,
+0x40df0b66, 0x37d83bf0, 0xa9bcae53, 0xdebb9ec5, 0x47b2cf7f, 0x30b5ffe9,
+0xbdbdf21c, 0xcabac28a, 0x53b39330, 0x24b4a3a6, 0xbad03605, 0xcdd70693,
+0x54de5729, 0x23d967bf, 0xb3667a2e, 0xc4614ab8, 0x5d681b02, 0x2a6f2b94,
+0xb40bbe37, 0xc30c8ea1, 0x5a05df1b, 0x2d02ef8d
+};
+
+#define UPDC32(octet,crc) (crc_32_tab[((crc) ^ (octet)) & 0xff] ^ ((crc) >> 8))
+
+uint32_t crc32buf(char *buf, size_t len)
+{
+      uint32_t crc;
+
+      crc = 0xFFFFFFFF;
+
+      for ( ; len; --len, ++buf)
+      {
+            crc = UPDC32(*buf, crc);
+      }
+
+      return crc;
+}
diff --git a/tools/firmware-utils/src/trx2usr.c b/tools/firmware-utils/src/trx2usr.c
new file mode 100644
index 0000000000..96c0ab285e
--- /dev/null
+++ b/tools/firmware-utils/src/trx2usr.c
@@ -0,0 +1,186 @@
+/*
+ * trx2usr - Convert a TRX firmware image to a U.S. Robotics firmware
+ *           image by prepending a 28-byte header.
+ *
+ * This program was modeled after the usr-hdr.c program from the GPL'ed
+ * firmware for the U.S. Robotics Wireless MAXg Router (USR5461). The
+ * output file of this program can be uploaded via the web interface
+ * of the original U.S. Robotics firmware. Note that this program only
+ * works on a little-endian host platform.
+ *
+ * Copyright (C) 2006 Dick Streefland
+ *
+ * This is free software, licensed under the terms of the GNU General
+ * Public License as published by the Free Software Foundation.
+ */
+
+#include <stdio.h>
+#include <unistd.h>
+#include <stdlib.h>
+#include <string.h>
+#include <errno.h>
+
+#define	TRX_MAGIC		"HDR0"
+
+#define	USR_MAGIC		0x30525355	// "USR0"
+#define	EPI_VERSION		0x06235d03
+#define	COMPAT_ID		1		// USR5461
+#define	HARDWARE_REV		1
+
+#define	CRC32_INIT		0xffffffff
+#define	CHUNK			(64*1024)
+
+typedef	unsigned char		uint8;
+typedef	unsigned short		uint16;
+typedef	unsigned int		uint32;
+
+struct	usr_header
+{
+	uint32	magic;			// "USR0" 
+	uint32	len;			// file length without this header 
+	uint32	crc32;			// CRC32 of the file without header 
+	uint32	version;		// EPI_VERSION
+	uint16	compatibility_id;	// COMPAT_ID
+	uint16	hardware_revision;	// HARDWARE_REV
+	uint32	reserved[2];
+};
+	
+static	const	uint32		crc_32_tab [] =	// CRC polynomial 0xedb88320
+{
+	0x00000000, 0x77073096, 0xee0e612c, 0x990951ba, 0x076dc419, 0x706af48f,
+	0xe963a535, 0x9e6495a3, 0x0edb8832, 0x79dcb8a4, 0xe0d5e91e, 0x97d2d988,
+	0x09b64c2b, 0x7eb17cbd, 0xe7b82d07, 0x90bf1d91, 0x1db71064, 0x6ab020f2,
+	0xf3b97148, 0x84be41de, 0x1adad47d, 0x6ddde4eb, 0xf4d4b551, 0x83d385c7,
+	0x136c9856, 0x646ba8c0, 0xfd62f97a, 0x8a65c9ec, 0x14015c4f, 0x63066cd9,
+	0xfa0f3d63, 0x8d080df5, 0x3b6e20c8, 0x4c69105e, 0xd56041e4, 0xa2677172,
+	0x3c03e4d1, 0x4b04d447, 0xd20d85fd, 0xa50ab56b, 0x35b5a8fa, 0x42b2986c,
+	0xdbbbc9d6, 0xacbcf940, 0x32d86ce3, 0x45df5c75, 0xdcd60dcf, 0xabd13d59,
+	0x26d930ac, 0x51de003a, 0xc8d75180, 0xbfd06116, 0x21b4f4b5, 0x56b3c423,
+	0xcfba9599, 0xb8bda50f, 0x2802b89e, 0x5f058808, 0xc60cd9b2, 0xb10be924,
+	0x2f6f7c87, 0x58684c11, 0xc1611dab, 0xb6662d3d, 0x76dc4190, 0x01db7106,
+	0x98d220bc, 0xefd5102a, 0x71b18589, 0x06b6b51f, 0x9fbfe4a5, 0xe8b8d433,
+	0x7807c9a2, 0x0f00f934, 0x9609a88e, 0xe10e9818, 0x7f6a0dbb, 0x086d3d2d,
+	0x91646c97, 0xe6635c01, 0x6b6b51f4, 0x1c6c6162, 0x856530d8, 0xf262004e,
+	0x6c0695ed, 0x1b01a57b, 0x8208f4c1, 0xf50fc457, 0x65b0d9c6, 0x12b7e950,
+	0x8bbeb8ea, 0xfcb9887c, 0x62dd1ddf, 0x15da2d49, 0x8cd37cf3, 0xfbd44c65,
+	0x4db26158, 0x3ab551ce, 0xa3bc0074, 0xd4bb30e2, 0x4adfa541, 0x3dd895d7,
+	0xa4d1c46d, 0xd3d6f4fb, 0x4369e96a, 0x346ed9fc, 0xad678846, 0xda60b8d0,
+	0x44042d73, 0x33031de5, 0xaa0a4c5f, 0xdd0d7cc9, 0x5005713c, 0x270241aa,
+	0xbe0b1010, 0xc90c2086, 0x5768b525, 0x206f85b3, 0xb966d409, 0xce61e49f,
+	0x5edef90e, 0x29d9c998, 0xb0d09822, 0xc7d7a8b4, 0x59b33d17, 0x2eb40d81,
+	0xb7bd5c3b, 0xc0ba6cad, 0xedb88320, 0x9abfb3b6, 0x03b6e20c, 0x74b1d29a,
+	0xead54739, 0x9dd277af, 0x04db2615, 0x73dc1683, 0xe3630b12, 0x94643b84,
+	0x0d6d6a3e, 0x7a6a5aa8, 0xe40ecf0b, 0x9309ff9d, 0x0a00ae27, 0x7d079eb1,
+	0xf00f9344, 0x8708a3d2, 0x1e01f268, 0x6906c2fe, 0xf762575d, 0x806567cb,
+	0x196c3671, 0x6e6b06e7, 0xfed41b76, 0x89d32be0, 0x10da7a5a, 0x67dd4acc,
+	0xf9b9df6f, 0x8ebeeff9, 0x17b7be43, 0x60b08ed5, 0xd6d6a3e8, 0xa1d1937e,
+	0x38d8c2c4, 0x4fdff252, 0xd1bb67f1, 0xa6bc5767, 0x3fb506dd, 0x48b2364b,
+	0xd80d2bda, 0xaf0a1b4c, 0x36034af6, 0x41047a60, 0xdf60efc3, 0xa867df55,
+	0x316e8eef, 0x4669be79, 0xcb61b38c, 0xbc66831a, 0x256fd2a0, 0x5268e236,
+	0xcc0c7795, 0xbb0b4703, 0x220216b9, 0x5505262f, 0xc5ba3bbe, 0xb2bd0b28,
+	0x2bb45a92, 0x5cb36a04, 0xc2d7ffa7, 0xb5d0cf31, 0x2cd99e8b, 0x5bdeae1d,
+	0x9b64c2b0, 0xec63f226, 0x756aa39c, 0x026d930a, 0x9c0906a9, 0xeb0e363f,
+	0x72076785, 0x05005713, 0x95bf4a82, 0xe2b87a14, 0x7bb12bae, 0x0cb61b38,
+	0x92d28e9b, 0xe5d5be0d, 0x7cdcefb7, 0x0bdbdf21, 0x86d3d2d4, 0xf1d4e242,
+	0x68ddb3f8, 0x1fda836e, 0x81be16cd, 0xf6b9265b, 0x6fb077e1, 0x18b74777,
+	0x88085ae6, 0xff0f6a70, 0x66063bca, 0x11010b5c, 0x8f659eff, 0xf862ae69,
+	0x616bffd3, 0x166ccf45, 0xa00ae278, 0xd70dd2ee, 0x4e048354, 0x3903b3c2,
+	0xa7672661, 0xd06016f7, 0x4969474d, 0x3e6e77db, 0xaed16a4a, 0xd9d65adc,
+	0x40df0b66, 0x37d83bf0, 0xa9bcae53, 0xdebb9ec5, 0x47b2cf7f, 0x30b5ffe9,
+	0xbdbdf21c, 0xcabac28a, 0x53b39330, 0x24b4a3a6, 0xbad03605, 0xcdd70693,
+	0x54de5729, 0x23d967bf, 0xb3667a2e, 0xc4614ab8, 0x5d681b02, 0x2a6f2b94,
+	0xb40bbe37, 0xc30c8ea1, 0x5a05df1b, 0x2d02ef8d,
+};
+
+static	char	buf[CHUNK];
+
+static	uint32	crc32(uint32 crc, uint8* p, size_t n)
+{
+	while (n--)
+	{
+		crc = crc_32_tab[(crc ^ *p++) & 0xff] ^ (crc >> 8);
+	}
+	return crc;
+}
+
+static	int	trx2usr(FILE* trx, FILE* usr)
+{
+	struct usr_header	hdr;
+	size_t			n;
+
+	hdr.magic		= USR_MAGIC;
+	hdr.len			= 0;
+	hdr.crc32		= CRC32_INIT;
+	hdr.version		= EPI_VERSION;
+	hdr.compatibility_id	= COMPAT_ID;
+	hdr.hardware_revision	= HARDWARE_REV;
+	hdr.reserved[0]		= 0;
+	hdr.reserved[1]		= 0;
+	fwrite(& hdr, sizeof(hdr), 1, usr);
+	while ((n = fread(buf, 1, CHUNK, trx)))
+	{
+		if (hdr.len == 0 && strncmp(buf, TRX_MAGIC, strlen(TRX_MAGIC)) != 0)
+		{
+			break;
+		}
+		fwrite(& buf, 1, n, usr);
+		hdr.len += n;
+		hdr.crc32 = crc32( hdr.crc32, (uint8 *) & buf, n);
+	}
+	fseek(usr, 0L, SEEK_SET);
+	fwrite(& hdr, sizeof(hdr), 1, usr);
+	if (n != 0)
+	{
+		fprintf(stderr, "Input is not a TRX file\n");
+		return 1;
+	}
+	if (hdr.len == 0)
+	{
+		fprintf(stderr, "Empty input\n");
+		return 1;
+	}
+	if (ferror(trx))
+	{
+		fprintf(stderr, "Read error\n");
+		return 1;
+	}
+	if (ferror(usr))
+	{
+		fprintf(stderr, "Write error\n");
+		return 1;
+	}
+	return 0;
+}
+
+extern	int	main(int argc, char *argv[])
+{
+	FILE*	in;
+	FILE*	out;
+	int	ret;
+
+	if (argc != 3)
+	{
+		fprintf(stderr, "Usage: trx2usr <trx input> <usr output>\n");
+		exit(2);
+	}
+	in  = fopen(argv[1], "rb");
+	if (!in)
+	{
+		fprintf(stderr, "Cannot open \"%s\": %s\n", argv[1], strerror(errno));
+		exit(1);
+	}
+	out = fopen(argv[2], "wb");
+	if (!out)
+	{
+		fprintf(stderr, "Cannot create \"%s\": %s\n", argv[2], strerror(errno));
+		exit(1);
+	}
+	ret = trx2usr(in, out);
+	fclose(in);
+	fclose(out);
+	if (ret)
+	{
+		unlink(argv[2]);
+	}
+	return ret;
+}