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>
diff --git a/common/cmd_part.c b/common/cmd_part.c
new file mode 100644
index 0000000..d997597
--- /dev/null
+++ b/common/cmd_part.c
@@ -0,0 +1,105 @@
+/*
+ * 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"
+);