diff options
| -rw-r--r-- | cmd/gpt.c | 46 | ||||
| -rw-r--r-- | doc/README.gpt | 17 |
2 files changed, 55 insertions, 8 deletions
@@ -350,17 +350,46 @@ static int get_gpt_info(struct blk_desc *dev_desc) } /* a wrapper to test get_gpt_info */ -static int do_get_gpt_info(struct blk_desc *dev_desc) +static int do_get_gpt_info(struct blk_desc *dev_desc, char * const namestr) { - int ret; + int numparts; + + numparts = get_gpt_info(dev_desc); + + if (numparts > 0) { + if (namestr) { + char disk_guid[UUID_STR_LEN + 1]; + char *partitions_list; + int partlistlen; + int ret = -1; + + ret = get_disk_guid(dev_desc, disk_guid); + if (ret < 0) + return ret; + + partlistlen = calc_parts_list_len(numparts); + partitions_list = malloc(partlistlen); + if (!partitions_list) { + del_gpt_info(); + return -ENOMEM; + } + memset(partitions_list, '\0', partlistlen); + + ret = create_gpt_partitions_list(numparts, disk_guid, + partitions_list); + if (ret < 0) + printf("Error: Could not create partition list string!\n"); + else + env_set(namestr, partitions_list); - ret = get_gpt_info(dev_desc); - if (ret > 0) { - print_gpt_info(); + free(partitions_list); + } else { + print_gpt_info(); + } del_gpt_info(); return 0; } - return ret; + return numparts; } #endif @@ -982,7 +1011,7 @@ static int do_gpt(struct cmd_tbl *cmdtp, int flag, int argc, char *const argv[]) ret = do_disk_guid(blk_dev_desc, argv[4]); #ifdef CONFIG_CMD_GPT_RENAME } else if (strcmp(argv[1], "read") == 0) { - ret = do_get_gpt_info(blk_dev_desc); + ret = do_get_gpt_info(blk_dev_desc, (argc == 5) ? argv[4] : NULL); } else if ((strcmp(argv[1], "swap") == 0) || (strcmp(argv[1], "rename") == 0)) { ret = do_rename_gpt_parts(blk_dev_desc, argv[1], argv[4], argv[5]); @@ -1028,8 +1057,9 @@ U_BOOT_CMD(gpt, CONFIG_SYS_MAXARGS, 1, do_gpt, " gpt guid mmc 0 varname\n" #ifdef CONFIG_CMD_GPT_RENAME "gpt partition renaming commands:\n" - " gpt read <interface> <dev>\n" + " gpt read <interface> <dev> [<varname>]\n" " - read GPT into a data structure for manipulation\n" + " - read GPT partitions into environment variable\n" " gpt swap <interface> <dev> <name1> <name2>\n" " - change all partitions named name1 to name2\n" " and vice-versa\n" diff --git a/doc/README.gpt b/doc/README.gpt index ac975f66b8..91e397d06f 100644 --- a/doc/README.gpt +++ b/doc/README.gpt @@ -237,6 +237,23 @@ doc/arch/index.rst: => gpt swap host 0 name othername [ . . . ] +Modifying GPT partition layout from U-Boot: +=========================================== + +The entire GPT partition layout can be exported to an environment +variable and then modified enmasse. Users can change the partition +numbers, offsets, names and sizes. The resulting variable can used to +reformat the device. Here is an example of reading the GPT partitions +into a variable and then modifying them: + +U-BOOT> gpt read mmc 0 current_partitions +U-BOOT> env edit current_partitions +edit: uuid_disk=[...];name=part1,start=0x4000,size=0x4000,uuid=[...]; +name=part2,start=0xc000,size=0xc000,uuid=[...];[ . . . ] + +U-BOOT> gpt write mmc 0 $current_partitions +U-BOOT> gpt verify mmc 0 $current_partitions + Partition type GUID: ==================== |