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
  15 int do_read(cmd_tbl_t *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         disk_partition_t 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)simple_strtoul(argv[2], &ep, 16);
  34         if (*ep) {
  35                 if (*ep != ':') {
  36                         printf("Invalid block device %s\n", argv[2]);
  37                         return 1;
  38                 }
  39                 part = (int)simple_strtoul(++ep, NULL, 16);
  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 *)simple_strtoul(argv[3], NULL, 16);
  49         blk = simple_strtoul(argv[4], NULL, 16);
  50         cnt = simple_strtoul(argv[5], NULL, 16);
  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
  77 U_BOOT_CMD(
  78         read,   6,      0,      do_read,
  79         "Load binary data from a partition",
  80         "<interface> <dev[:part]> addr blk# cnt"
  81 );