LXR uboot/cmd/read.c

   1/*
   2 * Copyright (c) 2011 The Chromium OS Authors. All rights reserved.
   3 * Use of this source code is governed by a BSD-style license that can be
   4 * found in the LICENSE file.
   5 *
   6 * Alternatively, this software may be distributed under the terms of the
   7 * GNU General Public License ("GPL") version 2 as published by the Free
   8 * Software Foundation.
   9 */
  10
  11#include <common.h>
  12#include <command.h>
  13#include <part.h>
  14
  15int do_read(struct cmd_tbl *cmdtp, int flag, int argc, char *const argv[])
  16{
  17        char *ep;
  18        struct blk_desc *dev_desc = NULL;
  19        int dev;
  20        int part = 0;
  21        struct disk_partition part_info;
  22        ulong offset = 0u;
  23        ulong limit = 0u;
  24        void *addr;
  25        uint blk;
  26        uint cnt;
  27
  28        if (argc != 6) {
  29                cmd_usage(cmdtp);
  30                return 1;
  31        }
  32
  33        dev = (int)hextoul(argv[2], &ep);
  34        if (*ep) {
  35                if (*ep != ':') {
  36                        printf("Invalid block device %s\n", argv[2]);
  37                        return 1;
  38                }
  39                part = (int)hextoul(++ep, NULL);
  40        }
  41
  42        dev_desc = blk_get_dev(argv[1], dev);
  43        if (dev_desc == NULL) {
  44                printf("Block device %s %d not supported\n", argv[1], dev);
  45                return 1;
  46        }
  47
  48        addr = (void *)hextoul(argv[3], NULL);
  49        blk = hextoul(argv[4], NULL);
  50        cnt = hextoul(argv[5], NULL);
  51
  52        if (part != 0) {
  53                if (part_get_info(dev_desc, part, &part_info)) {
  54                        printf("Cannot find partition %d\n", part);
  55                        return 1;
  56                }
  57                offset = part_info.start;
  58                limit = part_info.size;
  59        } else {
  60                /* Largest address not available in struct blk_desc. */
  61                limit = ~0;
  62        }
  63
  64        if (cnt + blk > limit) {
  65                printf("Read out of range\n");
  66                return 1;
  67        }
  68
  69        if (blk_dread(dev_desc, offset + blk, cnt, addr) != cnt) {
  70                printf("Error reading blocks\n");
  71                return 1;
  72        }
  73
  74        return 0;
  75}
  76
  77U_BOOT_CMD(
  78        read,   6,      0,      do_read,
  79        "Load binary data from a partition",
  80        "<interface> <dev[:part]> addr blk# cnt"
  81);
  82