cmd/ab_select.c

   1 // SPDX-License-Identifier: BSD-2-Clause
   2 /*
   3  * Copyright (C) 2017 The Android Open Source Project
   4  */
   5
   6 #include <android_ab.h>
   7 #include <command.h>
   8
   9 static int do_ab_select(cmd_tbl_t *cmdtp, int flag, int argc,
  10                         char * const argv[])
  11 {
  12         int ret;
  13         struct blk_desc *dev_desc;
  14         disk_partition_t part_info;
  15         char slot[2];
  16
  17         if (argc != 4)
  18                 return CMD_RET_USAGE;
  19
  20         /* Lookup the "misc" partition from argv[2] and argv[3] */
  21         if (part_get_info_by_dev_and_name_or_num(argv[2], argv[3],
  22                                                  &dev_desc, &part_info) < 0) {
  23                 return CMD_RET_FAILURE;
  24         }
  25
  26         ret = ab_select_slot(dev_desc, &part_info);
  27         if (ret < 0) {
  28                 printf("Android boot failed, error %d.\n", ret);
  29                 return CMD_RET_FAILURE;
  30         }
  31
  32         /* Android standard slot names are 'a', 'b', ... */
  33         slot[0] = BOOT_SLOT_NAME(ret);
  34         slot[1] = '\0';
  35         env_set(argv[1], slot);
  36         printf("ANDROID: Booting slot: %s\n", slot);
  37         return CMD_RET_SUCCESS;
  38 }
  39
  40 U_BOOT_CMD(ab_select, 4, 0, do_ab_select,
  41            "Select the slot used to boot from and register the boot attempt.",
  42            "<slot_var_name> <interface> <dev[:part|#part_name]>\n"
  43            "    - Load the slot metadata from the partition 'part' on\n"
  44            "      device type 'interface' instance 'dev' and store the active\n"
  45            "      slot in the 'slot_var_name' variable. This also updates the\n"
  46            "      Android slot metadata with a boot attempt, which can cause\n"
  47            "      successive calls to this function to return a different result\n"
  48            "      if the returned slot runs out of boot attempts.\n"
  49            "    - If 'part_name' is passed, preceded with a # instead of :, the\n"
  50            "      partition name whose label is 'part_name' will be looked up in\n"
  51            "      the partition table. This is commonly the \"misc\" partition.\n"
  52 );