| .. SPDX-License-Identifier: GPL-2.0+ |
| .. _partitions: |
| |
| Partitions |
| ========== |
| |
| Synopsis |
| -------- |
| |
| :: |
| |
| <command> <interface> [devnum][.hwpartnum][:partnum|#partname] |
| |
| Description |
| ----------- |
| |
| Many U-Boot commands allow specifying partitions (or whole disks) using a |
| generic syntax. |
| |
| interface |
| The interface used to access the partition's device, like ``mmc`` or |
| ``scsi``. For a full list of supported interfaces, consult the |
| ``uclass_idname_str`` array in ``drivers/block/blk-uclass.c`` |
| |
| devnum |
| The device number. This defaults to 0. |
| |
| hwpartnum |
| The hardware partition number. All devices have at least one hardware |
| partition. On most devices, hardware partition 0 specifies the whole |
| device. On eMMC devices, hardware partition 0 is the user partition, |
| hardware partitions 1 and 2 are the boot partitions, hardware partition |
| 3 is the RPMB partition, and further partitions are general-purpose |
| user-created partitions. The default hardware partition number is 0. |
| |
| partnum |
| The partition number, starting from 1. The partition number 0 specifies |
| that the whole device is to be used as one "partition." |
| |
| partname |
| The partition name. This is the partition label for GPT partitions. For |
| MBR partitions, the following syntax is used:: |
| |
| <devtype><devletter><partnum> |
| |
| devtype |
| The devtype field is set in dependence of the device class: |
| |
| ======= =============== |
| devtype device class |
| ======= =============== |
| hd IDE or SATA |
| sd SCSI |
| usbd USB |
| mmcsd eMMC or SD-card |
| xx others |
| ======= =============== |
| |
| See the ``part_set_generic_name`` function in ``disk/part.c`` |
| for the complete list. |
| |
| devletter |
| The device number as an offset from ``a``. For example, device |
| number 2 would have a device letter of ``c``. |
| |
| partnum |
| The partition number. This is the same as above. |
| |
| If neither ``partname`` nor ``partnum`` is specified and there is a partition |
| table, then partition 1 is used. If there is no partition table, then the whole |
| device is used as one "partition." If none of ``devnum``, ``hwpartnum``, |
| ``partnum``, or ``partname`` is specified, or only ``-`` is specified, then |
| ``devnum`` defaults to the value of the ``bootdevice`` environmental variable. |
| |
| Examples |
| -------- |
| |
| List the root directory contents on MMC device 2, hardware partition 1, |
| and partition number 3:: |
| |
| ls mmc 2.1:3 / |
| |
| Load ``/kernel.itb`` to address ``0x80000000`` from SCSI device 0, hardware partition |
| 0, and the partition labeled ``boot``:: |
| |
| load scsi #boot 0x80000000 /kernel.itb |
| |
| Print the partition UUID of the SATA device ``$bootdevice``, hardware partition |
| 0, and partition number 0:: |
| |
| part uuid sata - |