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This documents the way U-Boot understands partitions specifications. This also updates the fastboot documentation for the changes in the previous commit. Signed-off-by: Sean Anderson <sean.anderson@seco.com> Reviewed-by: Simon Glass <sjg@chromium.org>
80 lines
2.6 KiB
ReStructuredText
80 lines
2.6 KiB
ReStructuredText
.. SPDX-License-Identifier: GPL-2.0+
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.. _partitions:
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Partitions
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==========
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Synopsis
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--------
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::
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<command> <interface> [devnum][.hwpartnum][:partnum|#partname]
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Description
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-----------
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Many U-Boot commands allow specifying partitions (or whole disks) using a
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generic syntax.
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interface
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The interface used to access the partition's device, like ``mmc`` or
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``scsi``. For a full list of supported interfaces, consult the
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``if_typename_str`` array in ``drivers/block/blk-uclass.c``
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devnum
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The device number. This defaults to 0.
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hwpartnum
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The hardware partition number. All devices have at least one hardware
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partition. On most devices, hardware partition 0 specifies the whole
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device. On eMMC devices, hardware partition 0 is the user partition,
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hardware partitions 1 and 2 are the boot partitions, hardware partition
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3 is the RPMB partition, and further partitions are general-purpose
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user-created partitions. The default hardware partition number is 0.
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partnum
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The partition number, starting from 1. The partition number 0 specifies
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that the whole device is to be used as one "partition."
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partname
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The partition name. This is the partition label for GPT partitions. For
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MBR partitions, the following syntax is used::
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<devtype><devletter><partnum>
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devtype
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A device type like ``mmcsd`` or ``hd``. See the
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``part_set_generic_name`` function in ``disk/part.c`` for a
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complete list.
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devletter
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The device number as an offset from ``a``. For example, device
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number 2 would have a device letter of ``c``.
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partnum
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The partition number. This is the same as above.
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If neither ``partname`` nor ``partnum`` is specified and there is a partition
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table, then partition 1 is used. If there is no partition table, then the whole
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device is used as one "partition." If none of ``devnum``, ``hwpartnum``,
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``partnum``, or ``partname`` is specified, or only ``-`` is specified, then
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``devnum`` defaults to the value of the ``bootdevice`` environmental variable.
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Examples
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--------
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List the root directory contents on MMC device 2, hardware partition 1,
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and partition number 3::
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ls mmc 2.1:3 /
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Load ``/kernel.itb`` to address ``0x80000000`` from SCSI device 0, hardware partition
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0, and the partition labeled ``boot``::
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load scsi #boot 0x80000000 /kernel.itb
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Print the partition UUID of the SATA device ``$bootdevice``, hardware partition
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0, and partition number 0::
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part uuid sata -
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