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part: Allow setting the partition-table type

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Some devices have multiple partition types available on the same media.
It is sometimes useful to see these to check that everything is working
correctly.

Provide a way to manually set the partition-table type, avoiding the
auto-detection process.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
This commit is contained in:
Simon Glass 2023-07-15 21:38:47 -06:00 • committed by Bin Meng
parent b279f5170a
commit 125194e6a1
4 changed files with 133 additions and 0 deletions
cmd
part.c
disk
part.c
doc/usage/cmd
part.rst
include
part.h

34
cmd/part.c
View file

@ -182,6 +182,36 @@ static int do_part_number(int argc, char *const argv[])
return do_part_info(argc, argv, CMD_PART_INFO_NUMBER);
}
static int do_part_set(int argc, char *const argv[])
{
const char *devname, *partstr, *typestr;
struct blk_desc *desc;
int dev;
if (argc < 3)
return CMD_RET_USAGE;
/* Look up the device */
devname = argv[0];
partstr = argv[1];
typestr = argv[2];
dev = blk_get_device_by_str(devname, partstr, &desc);
if (dev < 0) {
printf("** Bad device specification %s %s **\n", devname,
partstr);
return CMD_RET_FAILURE;
}
desc->part_type = part_get_type_by_name(typestr);
if (!desc->part_type) {
printf("Unknown partition type '%s'\n", typestr);
return CMD_RET_FAILURE;
}
part_print(desc);
return 0;
}
#ifdef CONFIG_PARTITION_TYPE_GUID
static int do_part_type(int argc, char *const argv[])
{
@ -245,6 +275,8 @@ static int do_part(struct cmd_tbl *cmdtp, int flag, int argc,
return do_part_number(argc - 2, argv + 2);
else if (!strcmp(argv[1], "types"))
return do_part_types(argc - 2, argv + 2);
else if (!strcmp(argv[1], "set"))
return do_part_set(argc - 2, argv + 2);
#ifdef CONFIG_PARTITION_TYPE_GUID
else if (!strcmp(argv[1], "type"))
return do_part_type(argc - 2, argv + 2);
@ -279,6 +311,8 @@ U_BOOT_CMD(
#endif
"part type <interface> <dev>:<part> <varname>\n"
" - set environment variable to partition type\n"
"part set <interface> <dev> type\n"
" - set partition type for a device\n"
"part types\n"
" - list supported partition table types"
);

16
disk/part.c
View file

@ -54,6 +54,22 @@ static struct part_driver *part_driver_lookup_type(struct blk_desc *dev_desc)
return NULL;
}
int part_get_type_by_name(const char *name)
{
struct part_driver *drv =
ll_entry_start(struct part_driver, part_driver);
const int n_ents = ll_entry_count(struct part_driver, part_driver);
struct part_driver *entry;
for (entry = drv; entry != drv + n_ents; entry++) {
if (!strcasecmp(name, entry->name))
return entry->part_type;
}
/* Not found */
return PART_TYPE_UNKNOWN;
}
static struct blk_desc *get_dev_hwpart(const char *ifname, int dev, int hwpart)
{
struct blk_desc *dev_desc;

74
doc/usage/cmd/part.rst
View file

@ -13,6 +13,7 @@ Synopis
part start <interface> <dev> <part> <varname>
part size <interface> <dev> <part> <varname>
part number <interface> <dev> <part> <varname>
part set <interface> <dev> <part> <type>
part type <interface> <dev>:<part> [varname]
part types
@ -82,6 +83,18 @@ part must be specified as partition name.
varname
a variable to store the current partition number value into
The 'part set' command sets the type of a partition. This is useful when
autodetection fails or does not do the correct thing:
interface
interface for accessing the block device (mmc, sata, scsi, usb, ....)
dev
device number
part
partition number
type
partition type to use (see 'part types') to check available types
The 'part type' command prints or sets an environment variable to the partition type UUID.
interface
@ -147,6 +160,67 @@ Examples
=> part types
Supported partition tables: EFI, AMIGA, DOS, ISO, MAC
This shows looking at a device with multiple partition tables::
=> virtio scan
=> part list virtio 0
Partition Map for VirtIO device 0 -- Partition Type: EFI
Part Start LBA End LBA Name
Attributes
Type GUID
Partition GUID
1 0x00000040 0x0092b093 "ISO9660"
attrs: 0x1000000000000001
type: ebd0a0a2-b9e5-4433-87c0-68b6b72699c7
guid: a0891d7e-b930-4513-94d8-f629dbd637b2
2 0x0092b094 0x0092d7e7 "Appended2"
attrs: 0x0000000000000000
type: c12a7328-f81f-11d2-ba4b-00a0c93ec93b
guid: a0891d7e-b930-4513-94db-f629dbd637b2
3 0x0092d7e8 0x0092da3f "Gap1"
attrs: 0x1000000000000001
type: ebd0a0a2-b9e5-4433-87c0-68b6b72699c7
guid: a0891d7e-b930-4513-94da-f629dbd637b2
=> ls virtio 0:3
=> part types
Supported partition tables: EFI, DOS, ISO
=> part set virtio 0 dos
Partition Map for VirtIO device 0 -- Partition Type: DOS
Part Start Sector Num Sectors UUID Type
1 1 9624191 00000000-01 ee
=> part set virtio 0 iso
Partition Map for VirtIO device 0 -- Partition Type: ISO
Part Start Sect x Size Type
1 3020 4 512 U-Boot
2 9613460 10068 512 U-Boot
=> part set virtio 0 efi
Partition Map for VirtIO device 0 -- Partition Type: EFI
Part Start LBA End LBA Name
Attributes
Type GUID
Partition GUID
1 0x00000040 0x0092b093 "ISO9660"
attrs: 0x1000000000000001
type: ebd0a0a2-b9e5-4433-87c0-68b6b72699c7
guid: a0891d7e-b930-4513-94d8-f629dbd637b2
2 0x0092b094 0x0092d7e7 "Appended2"
attrs: 0x0000000000000000
type: c12a7328-f81f-11d2-ba4b-00a0c93ec93b
guid: a0891d7e-b930-4513-94db-f629dbd637b2
3 0x0092d7e8 0x0092da3f "Gap1"
attrs: 0x1000000000000001
type: ebd0a0a2-b9e5-4433-87c0-68b6b72699c7
guid: a0891d7e-b930-4513-94da-f629dbd637b2
=>
Return value
------------

9
include/part.h
View file

@ -598,6 +598,15 @@ static inline struct part_driver *part_driver_get_first(void)
return ll_entry_start(struct part_driver, part_driver);
}
/**
* part_get_type_by_name() - Get partition type by name
*
* @name: Name of partition type to look up (not case-sensitive)
* Returns: Corresponding partition type (PART_TYPE_...) or PART_TYPE_UNKNOWN if
* not known
*/
int part_get_type_by_name(const char *name);
#else
static inline int part_driver_get_count(void)
{ return 0; }