| Sean Anderson | 21e8476 | 2021-02-05 09:39:02 -0500 | [diff] [blame] | 1 | .. SPDX-License-Identifier: GPL-2.0+ |
| 2 | .. _partitions: |
| 3 | |
| 4 | Partitions |
| 5 | ========== |
| 6 | |
| 7 | Synopsis |
| 8 | -------- |
| 9 | |
| 10 | :: |
| 11 | |
| 12 | <command> <interface> [devnum][.hwpartnum][:partnum|#partname] |
| 13 | |
| 14 | Description |
| 15 | ----------- |
| 16 | |
| 17 | Many U-Boot commands allow specifying partitions (or whole disks) using a |
| 18 | generic syntax. |
| 19 | |
| 20 | interface |
| 21 | The interface used to access the partition's device, like ``mmc`` or |
| 22 | ``scsi``. For a full list of supported interfaces, consult the |
| 23 | ``if_typename_str`` array in ``drivers/block/blk-uclass.c`` |
| 24 | |
| 25 | devnum |
| 26 | The device number. This defaults to 0. |
| 27 | |
| 28 | hwpartnum |
| 29 | The hardware partition number. All devices have at least one hardware |
| 30 | partition. On most devices, hardware partition 0 specifies the whole |
| 31 | device. On eMMC devices, hardware partition 0 is the user partition, |
| 32 | hardware partitions 1 and 2 are the boot partitions, hardware partition |
| 33 | 3 is the RPMB partition, and further partitions are general-purpose |
| 34 | user-created partitions. The default hardware partition number is 0. |
| 35 | |
| 36 | partnum |
| 37 | The partition number, starting from 1. The partition number 0 specifies |
| 38 | that the whole device is to be used as one "partition." |
| 39 | |
| 40 | partname |
| 41 | The partition name. This is the partition label for GPT partitions. For |
| 42 | MBR partitions, the following syntax is used:: |
| 43 | |
| 44 | <devtype><devletter><partnum> |
| 45 | |
| 46 | devtype |
| 47 | A device type like ``mmcsd`` or ``hd``. See the |
| 48 | ``part_set_generic_name`` function in ``disk/part.c`` for a |
| 49 | complete list. |
| 50 | |
| 51 | devletter |
| 52 | The device number as an offset from ``a``. For example, device |
| 53 | number 2 would have a device letter of ``c``. |
| 54 | |
| 55 | partnum |
| 56 | The partition number. This is the same as above. |
| 57 | |
| 58 | If neither ``partname`` nor ``partnum`` is specified and there is a partition |
| 59 | table, then partition 1 is used. If there is no partition table, then the whole |
| 60 | device is used as one "partition." If none of ``devnum``, ``hwpartnum``, |
| 61 | ``partnum``, or ``partname`` is specified, or only ``-`` is specified, then |
| 62 | ``devnum`` defaults to the value of the ``bootdevice`` environmental variable. |
| 63 | |
| 64 | Examples |
| 65 | -------- |
| 66 | |
| 67 | List the root directory contents on MMC device 2, hardware partition 1, |
| 68 | and partition number 3:: |
| 69 | |
| 70 | ls mmc 2.1:3 / |
| 71 | |
| 72 | Load ``/kernel.itb`` to address ``0x80000000`` from SCSI device 0, hardware partition |
| 73 | 0, and the partition labeled ``boot``:: |
| 74 | |
| 75 | load scsi #boot 0x80000000 /kernel.itb |
| 76 | |
| 77 | Print the partition UUID of the SATA device ``$bootdevice``, hardware partition |
| 78 | 0, and partition number 0:: |
| 79 | |
| 80 | part uuid sata - |