read.c 1.7 KB

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  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. #include <common.h>
  11. #include <command.h>
  12. #include <part.h>
  13. int do_read(struct cmd_tbl *cmdtp, int flag, int argc, char *const argv[])
  14. {
  15. char *ep;
  16. struct blk_desc *dev_desc = NULL;
  17. int dev;
  18. int part = 0;
  19. struct disk_partition part_info;
  20. ulong offset = 0u;
  21. ulong limit = 0u;
  22. void *addr;
  23. uint blk;
  24. uint cnt;
  25. if (argc != 6) {
  26. cmd_usage(cmdtp);
  27. return 1;
  28. }
  29. dev = (int)hextoul(argv[2], &ep);
  30. if (*ep) {
  31. if (*ep != ':') {
  32. printf("Invalid block device %s\n", argv[2]);
  33. return 1;
  34. }
  35. part = (int)hextoul(++ep, NULL);
  36. }
  37. dev_desc = blk_get_dev(argv[1], dev);
  38. if (dev_desc == NULL) {
  39. printf("Block device %s %d not supported\n", argv[1], dev);
  40. return 1;
  41. }
  42. addr = (void *)hextoul(argv[3], NULL);
  43. blk = hextoul(argv[4], NULL);
  44. cnt = hextoul(argv[5], NULL);
  45. if (part != 0) {
  46. if (part_get_info(dev_desc, part, &part_info)) {
  47. printf("Cannot find partition %d\n", part);
  48. return 1;
  49. }
  50. offset = part_info.start;
  51. limit = part_info.size;
  52. } else {
  53. /* Largest address not available in struct blk_desc. */
  54. limit = ~0;
  55. }
  56. if (cnt + blk > limit) {
  57. printf("Read out of range\n");
  58. return 1;
  59. }
  60. if (blk_dread(dev_desc, offset + blk, cnt, addr) != cnt) {
  61. printf("Error reading blocks\n");
  62. return 1;
  63. }
  64. return 0;
  65. }
  66. U_BOOT_CMD(
  67. read, 6, 0, do_read,
  68. "Load binary data from a partition",
  69. "<interface> <dev[:part]> addr blk# cnt"
  70. );