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common: cmd_part: start and size sub-commands introduction

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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>
This commit is contained in:
Paul Kocialkowski 2015-06-15 21:35:05 +02:00 committed by Tom Rini
parent a78f78ebeb
commit 8607c4f127
1 changed files with 77 additions and 1 deletions
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78
common/cmd_part.c
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@ -112,6 +112,74 @@ static int do_part_list(int argc, char * const argv[])
return 0; 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), LBAF, 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), LBAF, 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[]) static int do_part(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
{ {
if (argc < 2) 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); return do_part_uuid(argc - 2, argv + 2);
else if (!strcmp(argv[1], "list")) else if (!strcmp(argv[1], "list"))
return do_part_list(argc - 2, argv + 2); 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; return CMD_RET_USAGE;
} }
@ -136,5 +208,9 @@ U_BOOT_CMD(
" - print a device's partition table\n" " - print a device's partition table\n"
"part list <interface> <dev> [flags] <varname>\n" "part list <interface> <dev> [flags] <varname>\n"
" - set environment variable to the list of partitions\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)"
); );