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https://github.com/brain-hackers/u-boot-brain
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![Mike Dunn](/assets/img/avatar_default.png)
This adds a userspace linux utility that writes the u-boot image to an mtd partition on the docg4 nand flash. A special utility is required to do this because u-boot is partially loaded by an initial program loader (IPL) that is permanently programmed to the boot region of the flash. This IPL expects the image to be written in a unique format. The characteristics of this format can be summarized as follows: - Flash blocks to be loaded must have a magic number in the oob bytes of the first page of the block. - Each page must be written redundantly in the subsequent page. - The integrated flash controller's "reliable mode" is used, requiring that alternate 2k regions (4 pages) are skipped when writing. For these reasons, a u-boot image can not be written using nandwrite from mtd-utils. Signed-off-by: Mike Dunn <mikedunn@newsguy.com>
178 lines
4.6 KiB
C
178 lines
4.6 KiB
C
/*
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* Copyright (C) 2013 Mike Dunn <mikedunn@newsguy.com>
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*
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* This file is released under the terms of GPL v2 and any later version.
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* See the file COPYING in the root directory of the source tree for details.
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*
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*
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* This is a userspace Linux utility that, when run on the Treo 680, will
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* program u-boot to flash. The docg4 driver *must* be loaded with the
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* reliable_mode and ignore_badblocks parameters enabled:
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*
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* modprobe docg4 ignore_badblocks=1 reliable_mode=1
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*
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* This utility writes the concatenated spl + u-boot image to the start of the
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* mtd device in the format expected by the IPL/SPL. The image file and mtd
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* device node are passed to the utility as arguments. The blocks must have
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* been erased beforehand.
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*
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* When you compile this, note that it links to libmtd from mtd-utils, so ensure
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* that your include and lib paths include this.
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#include <string.h>
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#include <sys/types.h>
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#include <unistd.h>
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#include <errno.h>
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#include <mtd/mtd-user.h>
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#include "libmtd.h"
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#define RELIABLE_BLOCKSIZE 0x10000 /* block capacity in reliable mode */
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#define STANDARD_BLOCKSIZE 0x40000 /* block capacity in normal mode */
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#define PAGESIZE 512
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#define PAGES_PER_BLOCK 512
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#define OOBSIZE 7 /* available to user (16 total) */
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uint8_t ff_oob[OOBSIZE] = {0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff};
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/* this is the magic number the IPL looks for (ASCII "BIPO") */
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uint8_t page0_oob[OOBSIZE] = {'B', 'I', 'P', 'O', 0xff, 0xff, 0xff};
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int main(int argc, char * const argv[])
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{
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int devfd, datafd, num_blocks, block;
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off_t file_size;
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libmtd_t mtd_desc;
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struct mtd_dev_info devinfo;
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uint8_t *blockbuf;
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char response[8];
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if (argc != 3) {
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printf("usage: %s <image file> <mtd dev node>\n", argv[0]);
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return -EINVAL;
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}
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mtd_desc = libmtd_open();
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if (mtd_desc == NULL) {
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int errsv = errno;
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fprintf(stderr, "can't initialize libmtd\n");
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return -errsv;
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}
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/* open the spl image file and mtd device */
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datafd = open(argv[1], O_RDONLY);
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if (datafd == -1) {
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int errsv = errno;
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perror(argv[1]);
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return -errsv;
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}
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devfd = open(argv[2], O_WRONLY);
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if (devfd == -1) {
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int errsv = errno;
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perror(argv[2]);
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return -errsv;
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}
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if (mtd_get_dev_info(mtd_desc, argv[2], &devinfo) < 0) {
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int errsv = errno;
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perror(argv[2]);
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return -errsv;
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}
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/* determine the number of blocks needed by the image */
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file_size = lseek(datafd, 0, SEEK_END);
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if (file_size == (off_t)-1) {
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int errsv = errno;
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perror("lseek");
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return -errsv;
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}
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num_blocks = (file_size + RELIABLE_BLOCKSIZE - 1) / RELIABLE_BLOCKSIZE;
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file_size = lseek(datafd, 0, SEEK_SET);
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if (file_size == (off_t)-1) {
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int errsv = errno;
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perror("lseek");
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return -errsv;
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}
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printf("The mtd partition contains %d blocks\n", devinfo.eb_cnt);
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printf("U-boot will occupy %d blocks\n", num_blocks);
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if (num_blocks > devinfo.eb_cnt) {
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fprintf(stderr, "Insufficient blocks on partition\n");
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return -EINVAL;
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}
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printf("IMPORTANT: These blocks must be in an erased state!\n");
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printf("Do you want to proceed?\n");
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scanf("%s", response);
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if ((response[0] != 'y') && (response[0] != 'Y')) {
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printf("Exiting\n");
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close(devfd);
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close(datafd);
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return 0;
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}
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blockbuf = calloc(RELIABLE_BLOCKSIZE, 1);
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if (blockbuf == NULL) {
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int errsv = errno;
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perror("calloc");
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return -errsv;
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}
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for (block = 0; block < num_blocks; block++) {
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int ofs, page;
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uint8_t *pagebuf = blockbuf, *buf = blockbuf;
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uint8_t *oobbuf = page0_oob; /* magic num in oob of 1st page */
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size_t len = RELIABLE_BLOCKSIZE;
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int ret;
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/* read data for one block from file */
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while (len) {
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ssize_t read_ret = read(datafd, buf, len);
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if (read_ret == -1) {
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int errsv = errno;
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if (errno == EINTR)
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continue;
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perror("read");
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return -errsv;
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} else if (read_ret == 0) {
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break; /* EOF */
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}
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len -= read_ret;
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buf += read_ret;
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}
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printf("Block %d: writing\r", block + 1);
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fflush(stdout);
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for (page = 0, ofs = 0;
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page < PAGES_PER_BLOCK;
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page++, ofs += PAGESIZE) {
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if (page & 0x04) /* Odd-numbered 2k page */
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continue; /* skipped in reliable mode */
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ret = mtd_write(mtd_desc, &devinfo, devfd, block, ofs,
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pagebuf, PAGESIZE, oobbuf, OOBSIZE,
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MTD_OPS_PLACE_OOB);
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if (ret) {
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fprintf(stderr,
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"\nmtd_write returned %d on block %d, ofs %x\n",
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ret, block + 1, ofs);
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return -EIO;
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}
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oobbuf = ff_oob; /* oob for subsequent pages */
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if (page & 0x01) /* odd-numbered subpage */
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pagebuf += PAGESIZE;
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}
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}
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printf("\nDone\n");
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close(devfd);
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close(datafd);
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free(blockbuf);
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return 0;
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}
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