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common: cmd_part: start and size sub-commands introduction
This introduces the part start and part size sub-commands. The purpose of these is to store the start block and size of a partition in a variable, given the device and partition number. This allows reading raw data that fits a single partition more easily. For instance, this could be used to figure out the start block and size of a kernel partition when a partition table is present, given the partition number. Signed-off-by: Paul Kocialkowski <contact@paulk.fr> Acked-by: Stephen Warren <swarren@nvidia.com> [trini: Change "%lx" to LBAF] Signed-off-by: Tom Rini <trini@konsulko.com>
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1 changed files with 77 additions and 1 deletions
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@ -112,6 +112,74 @@ static int do_part_list(int argc, char * const argv[])
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return 0;
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}
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static int do_part_start(int argc, char * const argv[])
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{
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block_dev_desc_t *desc;
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disk_partition_t info;
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char buf[512] = { 0 };
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int part;
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int err;
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int ret;
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if (argc < 3)
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return CMD_RET_USAGE;
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if (argc > 4)
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return CMD_RET_USAGE;
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part = simple_strtoul(argv[2], NULL, 0);
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ret = get_device(argv[0], argv[1], &desc);
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if (ret < 0)
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return 1;
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err = get_partition_info(desc, part, &info);
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if (err)
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return 1;
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snprintf(buf, sizeof(buf), LBAF, info.start);
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if (argc > 3)
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setenv(argv[3], buf);
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else
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printf("%s\n", buf);
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return 0;
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}
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static int do_part_size(int argc, char * const argv[])
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{
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block_dev_desc_t *desc;
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disk_partition_t info;
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char buf[512] = { 0 };
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int part;
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int err;
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int ret;
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if (argc < 3)
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return CMD_RET_USAGE;
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if (argc > 4)
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return CMD_RET_USAGE;
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part = simple_strtoul(argv[2], NULL, 0);
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ret = get_device(argv[0], argv[1], &desc);
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if (ret < 0)
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return 1;
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err = get_partition_info(desc, part, &info);
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if (err)
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return 1;
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snprintf(buf, sizeof(buf), LBAF, info.size);
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if (argc > 3)
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setenv(argv[3], buf);
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else
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printf("%s\n", buf);
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return 0;
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}
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static int do_part(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
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{
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if (argc < 2)
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@ -121,6 +189,10 @@ static int do_part(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
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return do_part_uuid(argc - 2, argv + 2);
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else if (!strcmp(argv[1], "list"))
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return do_part_list(argc - 2, argv + 2);
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else if (!strcmp(argv[1], "start"))
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return do_part_start(argc - 2, argv + 2);
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else if (!strcmp(argv[1], "size"))
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return do_part_size(argc - 2, argv + 2);
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return CMD_RET_USAGE;
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}
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@ -136,5 +208,9 @@ U_BOOT_CMD(
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" - print a device's partition table\n"
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"part list <interface> <dev> [flags] <varname>\n"
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" - set environment variable to the list of partitions\n"
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" flags can be -bootable (list only bootable partitions)"
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" flags can be -bootable (list only bootable partitions)\n"
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"part start <interface> <dev> <part> <varname>\n"
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" - set environment variable to the start of the partition (in blocks)\n"
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"part size <interface> <dev> <part> <varname>\n"
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" - set environment variable to the size of the partition (in blocks)"
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);
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