u-boot/common/cmd_part.c
Stephen Warren 5cf41dccff cmd_part: add partition-related command
This implements the following:

part uuid mmc 0:1
  -> print partition UUID
part uuid mmc 0:1 uuid
  -> set environment variable to partition UUID
part list mmc 0
  -> list the partitions on the specified device

"part uuid" can be useful when writing a bootcmd which searches all
known devices for something bootable, and then wants the kernel to
use the same partition as the root device, e.g.:

part uuid ${devtype} ${devnum}:${rootpart} uuid
setenv bootargs root=PARTUUID=${uuid} ...

Signed-off-by: Stephen Warren <swarren@nvidia.com>
2012-09-25 15:05:47 -07:00

106 lines
2.5 KiB
C

/*
* Copyright (c) 2012, NVIDIA CORPORATION. All rights reserved.
*
* made from cmd_ext2, which was:
*
* (C) Copyright 2004
* esd gmbh <www.esd-electronics.com>
* Reinhard Arlt <reinhard.arlt@esd-electronics.com>
*
* made from cmd_reiserfs by
*
* (C) Copyright 2003 - 2004
* Sysgo Real-Time Solutions, AG <www.elinos.com>
* Pavel Bartusek <pba@sysgo.com>
*
* See file CREDITS for list of people who contributed to this
* project.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 2 of
* the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <common.h>
#include <config.h>
#include <command.h>
#include <part.h>
#include <vsprintf.h>
#ifndef CONFIG_PARTITION_UUIDS
#error CONFIG_PARTITION_UUIDS must be enabled for CONFIG_CMD_PART to be enabled
#endif
int do_part_uuid(int argc, char * const argv[])
{
int part;
block_dev_desc_t *dev_desc;
disk_partition_t info;
if (argc < 2)
return CMD_RET_USAGE;
if (argc > 3)
return CMD_RET_USAGE;
part = get_device_and_partition(argv[0], argv[1], &dev_desc, &info, 0);
if (part < 0)
return 1;
if (argc > 2)
setenv(argv[2], info.uuid);
else
printf("%s\n", info.uuid);
return 0;
}
int do_part_list(int argc, char * const argv[])
{
int ret;
block_dev_desc_t *desc;
if (argc != 2)
return CMD_RET_USAGE;
ret = get_device(argv[0], argv[1], &desc);
if (ret < 0)
return 1;
print_part(desc);
return 0;
}
int do_part(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
{
if (argc < 2)
return CMD_RET_USAGE;
if (!strcmp(argv[1], "uuid"))
return do_part_uuid(argc - 2, argv + 2);
else if (!strcmp(argv[1], "list"))
return do_part_list(argc - 2, argv + 2);
return CMD_RET_USAGE;
}
U_BOOT_CMD(
part, 5, 1, do_part,
"disk partition related commands",
"part uuid <interface> <dev>:<part>\n"
" - print partition UUID\n"
"part uuid <interface> <dev>:<part> <varname>\n"
" - set environment variable to partition UUID\n"
"part list <interface> <dev>\n"
" - print a device's partition table"
);