mtd: Added fixtrx for brcm63xx imagetag. This allows brcm63xx boards which experience a CRC on second boot due to the JFFS2 creation / DEADC0DE deletion to work correctly when mtd fixtrx is run on first boot

Signed-off-by: Daniel Dickinson <daniel@cshore.neomailbox.net>

SVN-Revision: 24835

package/mtd/src/Makefile

@@ -4,6 +4,7 @@ CFLAGS += -Wall
 obj = mtd.o jffs2.o crc32.o
 obj.brcm = trx.o
 obj.brcm47xx = $(obj.brcm)
+obj.brcm63xx = imagetag.o
 
 ifdef FIS_SUPPORT
   obj += fis.o

package/mtd/src/bcm_tag.h

@@ -0,0 +1 @@
+../../../target/linux/brcm63xx/files/arch/mips/include/asm/mach-bcm63xx/bcm_tag.h

package/mtd/src/imagetag.c

@@ -0,0 +1,244 @@
+/*
+ * imagetag.c
+ *
+ * Copyright (C) 2005 Mike Baker
+ * Copyright (C) 2008 Felix Fietkau <nbd@openwrt.org>
+ * Copyrigth (C) 2010 Daniel Dickinson <openwrt@cshore.neomailbox.net>
+ *
+ * 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.
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <stddef.h>
+#include <unistd.h>
+#include <fcntl.h>
+#include <sys/mman.h>
+#include <sys/stat.h>
+#include <string.h>
+#include <errno.h>
+
+#include <sys/ioctl.h>
+#include "mtd-api.h"
+#include "mtd.h"
+#include "crc32.h"
+#include "bcm_tag.h"
+
+ssize_t pread(int fd, void *buf, size_t count, off_t offset);
+ssize_t pwrite(int fd, const void *buf, size_t count, off_t offset);
+
+#define CRC_START 0xFFFFFFFF
+
+static uint32_t strntoul(char *str, char **endptr, int base, size_t len) {
+  char *newstr;
+  uint32_t res = 0;
+
+  newstr = calloc(len + 1, sizeof(char));
+  if (newstr) {
+	strncpy(newstr, str, len); 
+	res = strtoul(newstr, endptr, base);
+	free(newstr);
+  }
+  return res;
+}
+
+uint32_t compute_crc32(uint32_t crc, off_t start, size_t compute_len, int fd)
+{
+	uint8_t readbuf[1024];
+	ssize_t res;
+	off_t offset = start;
+
+	/* Read a buffer's worth of bytes  */
+	while (fd && (compute_len >= sizeof(readbuf))) {
+		res = pread(fd, readbuf, sizeof(readbuf), offset);
+		crc = crc32(crc, readbuf, res);
+		compute_len = compute_len - res;
+		offset += res;
+	}
+
+	/* Less than buffer-size bytes remains, read compute_len bytes */
+	if (fd && (compute_len > 0)) {
+	  res = pread(fd, readbuf, compute_len, offset);
+	  crc = crc32(crc, readbuf, res);
+	}
+
+	return crc;
+}
+
+int
+trx_check(int imagefd, const char *mtd, char *buf, int *len)
+{
+    struct bcm_tag *tag = (const struct bcm_tag *) buf;
+	int fd;
+	uint32_t headerCRC;
+	uint32_t imageLen;
+
+	if (strcmp(mtd, "linux") != 0)
+		return 1;
+
+	*len = read(imagefd, buf, sizeof(struct bcm_tag));
+	if (*len < sizeof(struct bcm_tag)) {
+		fprintf(stdout, "Could not get image header, file too small (%d bytes)\n", *len);
+		return 0;
+	}
+	headerCRC = crc32buf(buf, offsetof(struct bcm_tag, headerCRC));
+	if (*(uint32_t *)(&tag->headerCRC[0]) != headerCRC) {
+  
+	  if (quiet < 2) {
+		fprintf(stderr, "Bad header CRC got %08lx, calculated %08lx\n",
+				*(uint32_t *)(&tag->headerCRC[0]), headerCRC);
+		fprintf(stderr, "This is not the correct file format; refusing to flash.\n"
+				"Please specify the correct file or use -f to force.\n");
+	  }
+	  return 0;
+	}
+
+	/* check if image fits to mtd device */
+	fd = mtd_check_open(mtd);
+	if(fd < 0) {
+		fprintf(stderr, "Could not open mtd device: %s\n", mtd);
+		exit(1);
+	}
+
+	imageLen = strntoul(&tag->totalLength[0], NULL, 10, IMAGE_LEN);
+	
+	if(mtdsize < imageLen) {
+		fprintf(stderr, "Image too big for partition: %s\n", mtd);
+		close(fd);
+		return 0;
+	}
+
+	close(fd);
+	return 1;
+}
+
+int
+mtd_fixtrx(const char *mtd, size_t offset)
+{
+	int fd;
+	struct bcm_tag *tag;
+	char *buf;
+	ssize_t res;
+	size_t block_offset;
+	uint32_t cfelen, imagelen, imagestart, rootfslen;
+	uint32_t imagecrc, rootfscrc, headercrc;
+	cfelen = imagelen = imagestart = imagecrc = rootfscrc = headercrc = rootfslen = 0;
+
+	if (quiet < 2)
+		fprintf(stderr, "Trying to fix trx header in %s at 0x%x...\n", mtd, offset);
+
+	block_offset = offset & ~(erasesize - 1);
+	offset -= block_offset;
+
+	fd = mtd_check_open(mtd);
+	if(fd < 0) {
+		fprintf(stderr, "Could not open mtd device: %s\n", mtd);
+		exit(1);
+	}
+
+	if (block_offset + erasesize > mtdsize) {
+		fprintf(stderr, "Offset too large, device size 0x%x\n", mtdsize);
+		exit(1);
+	}
+
+	buf = malloc(erasesize);
+	if (!buf) {
+		perror("malloc");
+		exit(1);
+	}
+
+	res = pread(fd, buf, erasesize, block_offset);
+	if (res != erasesize) {
+		perror("pread");
+		exit(1);
+	}
+
+	tag = (struct bcm_tag *) (buf + offset);
+
+	cfelen = strntoul(&tag->cfeLength[0], NULL, 10, IMAGE_LEN);
+	if (cfelen) {
+	  fprintf(stderr, "Non-zero CFE length.  This is currently unsupported.\n");
+	  exit(1);
+	}
+
+	if (quiet < 2) {
+	  fprintf(stderr, "Verifying we actually have an imagetag.\n");
+	}
+
+	headercrc = compute_crc32(CRC_START, offset, offsetof(struct bcm_tag, headerCRC), fd);
+	if (headercrc != *(uint32_t *)(&tag->headerCRC[0])) {
+		fprintf(stderr, "Tag verify failed.  This may not be a valid image.\n");
+		exit(1);
+	}
+
+	if (quiet < 2) {
+	  fprintf(stderr, "Checking current fixed status.\n");
+	}
+
+	rootfslen = strntoul(&tag->rootLength[0], NULL, 10, IMAGE_LEN);
+	if (rootfslen == 0) {
+	  if (quiet < 2) 
+		fprintf(stderr, "Header already fixed, exiting\n");
+	  close(fd);
+	  return 0;
+	}
+
+	if (quiet < 2) {
+	  fprintf(stderr, "Setting root length to 0.\n");
+	}
+
+	sprintf(&tag->rootLength[0], "%lu", 0);
+	strncpy(&tag->totalLength[0], &tag->kernelLength[0], IMAGE_LEN);
+
+	if (quiet < 2) {
+	  fprintf(stderr, "Recalculating CRCs.\n");
+	}
+
+	imagestart = sizeof(tag);
+	memcpy(&tag->imageCRC[0], &tag->kernelCRC[0], CRC_LEN);
+	memcpy(&tag->fskernelCRC[0], &tag->kernelCRC[0], CRC_LEN);
+	rootfscrc = CRC_START;
+	memcpy(&tag->rootfsCRC[0], &rootfscrc, sizeof(uint32_t));
+	headercrc = crc32(CRC_START, tag, offsetof(struct bcm_tag, headerCRC));
+	memcpy(&tag->headerCRC[0], &headercrc, sizeof(uint32_t));
+
+	if (quiet < 2) {
+	  fprintf(stderr, "Erasing imagetag block\n");
+	}
+
+	if (mtd_erase_block(fd, block_offset)) {
+		fprintf(stderr, "Can't erase block at 0x%x (%s)\n", block_offset, strerror(errno));
+		exit(1);
+	}
+
+	if (quiet < 2) {
+	  fprintf(stderr, "New image crc32: 0x%x, rewriting block\n", 
+			  *(uint32_t *)(&tag->imageCRC[0]));
+	  fprintf(stderr, "New header crc32: 0x%x, rewriting block\n", headercrc);  
+	}
+
+	if (pwrite(fd, buf, erasesize, block_offset) != erasesize) {
+		fprintf(stderr, "Error writing block (%s)\n", strerror(errno));
+		exit(1);
+	}
+
+	if (quiet < 2)
+		fprintf(stderr, "Done.\n");
+
+	close (fd);
+	sync();
+	return 0;
+
+}

package/mtd/src/mtd.c

@@ -598,7 +598,7 @@ int main (int argc, char **argv)
 				break;
 			case 'o':
 			    if (!mtd_fixtrx) {
-				    fprintf(stderr, "-o: Only for brcm47xx\n");
+				    fprintf(stderr, "-o: Only for brcm47xx/brcm63xx\n");
 					usage();
 				}
 				errno = 0;