part: let list put the list in an environment variable

Add an optional third argument to the "part list" command which puts a
space seperated list of valid partitions into the given environment
variable. This is useful for allowing boot scripts to iterate of all
partitions of a device.

Signed-off-by: Sjoerd Simons <sjoerd.simons@collabora.co.uk>
Reviewed-by: Stephen Warren <swarren@nvidia.com>

diff --git a/common/cmd_part.c b/common/cmd_part.c
index 39e8666b774a4b0d45c2a0f9b06295ac975a20b5..c99f52735f057c92b556bf49a7c0559f1ef66575 100644 (file)
--- a/common/cmd_part.c
+++ b/common/cmd_part.c
@@ -54,13 +54,31 @@ static int do_part_list(int argc, char * const argv[])
        int ret;
        block_dev_desc_t *desc;
 
-       if (argc != 2)
+       if (argc < 2 || argc > 3)
                return CMD_RET_USAGE;
 
        ret = get_device(argv[0], argv[1], &desc);
        if (ret < 0)
                return 1;
 
+       if (argc == 3) {
+               int p;
+               char str[512] = { 0, };
+         disk_partition_t info;
+
+               for (p = 1; p < 128; p++) {
+                       int r = get_partition_info(desc, p, &info);
+
+                       if (r == 0) {
+                               char t[5];
+                               sprintf(t, "%s%d", str[0] ? " " : "", p);
+                               strcat(str, t);
+                       }
+               }
+               setenv(argv[2], str);
+               return 0;
+       }
+
        print_part(desc);
 
        return 0;
@@ -87,5 +105,7 @@ U_BOOT_CMD(
        "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"
+       "    - print a device's partition table\n"
+       "part list <interface> <dev> <varname>\n"
+       "    - set environment variable to the list of partitions"
 );