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 --- common/cmd_part.c | 78 ++++++++++++++++++++++++++++++++++++++++++++++++++++++- 1 file changed, 77 insertions(+), 1 deletion(-)

diff --git a/common/cmd_part.c b/common/cmd_part.c index 4bdbf90..8085d26 100644 --- a/common/cmd_part.c +++ b/common/cmd_part.c @@ -112,6 +112,74 @@ static int do_part_list(int argc, char * const argv[]) return 0; }

+static int do_part_start(int argc, char * const argv[]) +{ + block_dev_desc_t *desc; + disk_partition_t info; + char buf[512] = { 0 }; + int part; + int err; + int ret; + + if (argc < 3) + return CMD_RET_USAGE; + if (argc > 4) + return CMD_RET_USAGE; + + part = simple_strtoul(argv[2], NULL, 0); + + ret = get_device(argv[0], argv[1], &desc); + if (ret < 0) + return 1; + + err = get_partition_info(desc, part, &info); + if (err) + return 1; + + snprintf(buf, sizeof(buf), "%lx", info.start); + + if (argc > 3) + setenv(argv[3], buf); + else + printf("%s\n", buf); + + return 0; +} + +static int do_part_size(int argc, char * const argv[]) +{ + block_dev_desc_t *desc; + disk_partition_t info; + char buf[512] = { 0 }; + int part; + int err; + int ret; + + if (argc < 3) + return CMD_RET_USAGE; + if (argc > 4) + return CMD_RET_USAGE; + + part = simple_strtoul(argv[2], NULL, 0); + + ret = get_device(argv[0], argv[1], &desc); + if (ret < 0) + return 1; + + err = get_partition_info(desc, part, &info); + if (err) + return 1; + + snprintf(buf, sizeof(buf), "%lx", info.size); + + if (argc > 3) + setenv(argv[3], buf); + else + printf("%s\n", buf); + + return 0; +} + static int do_part(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[]) { if (argc < 2) @@ -121,6 +189,10 @@ static int do_part(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[]) return do_part_uuid(argc - 2, argv + 2); else if (!strcmp(argv[1], "list")) return do_part_list(argc - 2, argv + 2); + else if (!strcmp(argv[1], "start")) + return do_part_start(argc - 2, argv + 2); + else if (!strcmp(argv[1], "size")) + return do_part_size(argc - 2, argv + 2);

return CMD_RET_USAGE; } @@ -136,5 +208,9 @@ U_BOOT_CMD( " - print a device's partition table\n" "part list <interface> <dev> [flags] <varname>\n" " - set environment variable to the list of partitions\n" - " flags can be -bootable (list only bootable partitions)" + " flags can be -bootable (list only bootable partitions)\n" + "part start <interface> <dev> <part> <varname>\n" + " - set environment variable to the start of the partition (in blocks)\n" + "part size <interface> <dev> <part> <varname>\n" + " - set environment variable to the size of the partition (in blocks)" );