On 2/1/21 5:30 PM, Heinrich Schuchardt wrote:
On 01.02.21 17:43, Sean Anderson wrote:
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
Changes in v3:
- Rebase onto dfu/master
Changes in v2:
Move partition documentation under doc/usage
doc/android/fastboot.rst | 4 ++++ doc/usage/index.rst | 1 + doc/usage/part.rst | 33 +++++++++++++++++++++++++++++++++ 3 files changed, 38 insertions(+) create mode 100644 doc/usage/part.rst
diff --git a/doc/android/fastboot.rst b/doc/android/fastboot.rst index 16b11399b3..ce513a2a0f 100644 --- a/doc/android/fastboot.rst +++ b/doc/android/fastboot.rst @@ -154,6 +154,10 @@ The device index starts from ``a`` and refers to the interface (e.g. USB controller, SD/MMC controller) or disk index. The partition index starts from ``1`` and describes the partition number on the particular device.
+Alternatively, partition types may be specified using :ref:`U-Boot's partition +syntax <partitions>`. This allows specifying partitions like ``0.1``, +``0#boot``, or ``:3``. The interface is always ``mmc``.
Writing Partition Table
diff --git a/doc/usage/index.rst b/doc/usage/index.rst index 83cfbafd90..9b64434cb2 100644 --- a/doc/usage/index.rst +++ b/doc/usage/index.rst @@ -6,6 +6,7 @@ Use U-Boot
fdt_overlays netconsole
part
Shell commands
diff --git a/doc/usage/part.rst b/doc/usage/part.rst
There is a part command. That command should be in doc/usage/part.rst.
How about doc/usage/partitions.rst?
Ok. Perhaps commands should be in a subdirectory of doc/usage then? This will help separate general usage documentation from man pages.
new file mode 100644 index 0000000000..e58b529147 --- /dev/null +++ b/doc/usage/part.rst @@ -0,0 +1,33 @@ +.. SPDX-License-Identifier: GPL-2.0+ +.. _partitions:
+Partitions +==========
+Many U-Boot commands allow specifying partitions like::
- some_command <interface> devnum.hwpartnum:partnum
+or like::
- some_command <interface> <devnum.hwpartnum#partname
From the above it is not clear what is optional and what can go together.
Is this what you meant:
::
<command> <interface> <devnum>[.<hwpartnum>][:<partnum>|#<partname>]
Yes. This will work.
+Where
- ``interface`` is the device interface, like ``mmc`` or ``scsi``.
For a full
- list of supported interfaces, consult the ``if_typename_str`` array in
- ``drivers/block/blk-uclass.c``
- ``devnum`` is the device number. This defaults to 0.
- ``hwpartnum`` is the hardware partition number. This defaults to 0
Could you, please, use a text form like:
interface the device interface like mmc or scsi ...
devnum the device number ...
to match our existing man-pages.
Here interface and devnum will automatically be rendered in bold without adding disturbing mark-up. Cf. https://u-boot.readthedocs.io/en/latest/usage/for.html
(the user
- partition on eMMC devices).
- ``partname`` is the partition name on GPT devices. Partitions do
not have
- names on MBR devices.
- ``partnum`` is the partition number, starting from 1. The partition
number 0
- is special, and specifies that the whole device is to be used as one
- "partition."
+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, then ``devnum`` defaults to the value +of the ``bootdevice`` environmental variable.
Please, add examples with their interpretation.
Ok.
--Sean
A reference to the part command might be of interest.
Best regards
Heinrich