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 <cont...@paulk.fr>
---
common/cmd_part.c | 66 ++++++++++++++++++++++++++++++++++++++++++++++++++++++-
1 file changed, 65 insertions(+), 1 deletion(-)
diff --git a/common/cmd_part.c b/common/cmd_part.c
index 4bdbf90..b33498b 100644
--- a/common/cmd_part.c
+++ b/common/cmd_part.c
@@ -112,6 +112,62 @@ 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 < 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), "0x%x", info.start);
+ setenv(argv[3], 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 < 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), "0x%x", info.size);
+ setenv(argv[3], buf);
+
+ return 0;
+}
+
static int do_part(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
{
if (argc < 2)
@@ -121,6 +177,10 @@ 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 +196,9 @@ 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)"
);
--
1.9.1
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