1 // SPDX-License-Identifier: BSD-2-Clause
3 * Copyright (C) 2017 The Android Open Source Project
7 #include <android_ab.h>
12 static int do_ab_select(struct cmd_tbl *cmdtp, int flag, int argc,
16 struct blk_desc *dev_desc;
17 struct disk_partition part_info;
19 bool dec_tries = true;
24 for (int i = 4; i < argc; i++) {
25 if (strcmp(argv[i], "--no-dec") == 0) {
32 /* Lookup the "misc" partition from argv[2] and argv[3] */
33 if (part_get_info_by_dev_and_name_or_num(argv[2], argv[3],
34 &dev_desc, &part_info,
36 return CMD_RET_FAILURE;
40 ret = ab_select_slot(dev_desc, &part_info, dec_tries);
42 printf("Android boot failed, error %d.\n", ret);
43 return CMD_RET_FAILURE;
46 /* Android standard slot names are 'a', 'b', ... */
47 slot[0] = BOOT_SLOT_NAME(ret);
49 env_set(argv[1], slot);
50 printf("ANDROID: Booting slot: %s\n", slot);
51 return CMD_RET_SUCCESS;
54 U_BOOT_CMD(ab_select, 5, 0, do_ab_select,
55 "Select the slot used to boot from and register the boot attempt.",
56 "<slot_var_name> <interface> <dev[:part|#part_name]> [--no-dec]\n"
57 " - Load the slot metadata from the partition 'part' on\n"
58 " device type 'interface' instance 'dev' and store the active\n"
59 " slot in the 'slot_var_name' variable. This also updates the\n"
60 " Android slot metadata with a boot attempt, which can cause\n"
61 " successive calls to this function to return a different result\n"
62 " if the returned slot runs out of boot attempts.\n"
63 " - If 'part_name' is passed, preceded with a # instead of :, the\n"
64 " partition name whose label is 'part_name' will be looked up in\n"
65 " the partition table. This is commonly the \"misc\" partition.\n"
66 " - If '--no-dec' is set, the number of tries remaining will not\n"
67 " decremented for the selected boot slot\n"