mirror of
https://github.com/AsahiLinux/u-boot
synced 2024-11-17 02:08:38 +00:00
e7b2ce191e
Add documentation for this feature, including the commands and full devicetree bindings. Signed-off-by: Simon Glass <sjg@chromium.org>
135 lines
3.4 KiB
ReStructuredText
135 lines
3.4 KiB
ReStructuredText
.. SPDX-License-Identifier: GPL-2.0+:
|
|
|
|
bootdev command
|
|
===============
|
|
|
|
Synopis
|
|
-------
|
|
|
|
::
|
|
|
|
bootdev list [-p] - list all available bootdevs (-p to probe)\n"
|
|
bootdev select <bm> - select a bootdev by name\n"
|
|
bootdev info [-p] - show information about a bootdev";
|
|
|
|
Description
|
|
-----------
|
|
|
|
The `bootdev` command is used to manage bootdevs. It can list available
|
|
bootdevs, select one and obtain information about it.
|
|
|
|
See :doc:`../../develop/bootstd` for more information about bootdevs in general.
|
|
|
|
|
|
bootdev list
|
|
~~~~~~~~~~~~
|
|
|
|
This lists available bootdevs
|
|
|
|
Scanning with `-p` causes the bootdevs to be probed. This happens automatically
|
|
when they are used.
|
|
|
|
The list looks something like this:
|
|
|
|
=== ====== ====== ======== =========================
|
|
Seq Probed Status Uclass Name
|
|
=== ====== ====== ======== =========================
|
|
0 [ + ] OK mmc mmc@7e202000.bootdev
|
|
1 [ ] OK mmc sdhci@7e300000.bootdev
|
|
2 [ ] OK ethernet smsc95xx_eth.bootdev
|
|
=== ====== ====== ======== =========================
|
|
|
|
|
|
The fields are as follows:
|
|
|
|
Seq:
|
|
Sequence number in the scan, used to reference the bootflow later
|
|
|
|
Probed:
|
|
Shows a plus (+) if the device is probed, empty if not.
|
|
|
|
Status:
|
|
Shows the status of the device. Typically this is `OK` meaning that there is
|
|
no error. If you use -p and an error occurs when probing, then this shows
|
|
the error number. You can look up Linux error codes to find the meaning of
|
|
the number.
|
|
|
|
Uclass:
|
|
Name of the media device's Uclass. This indicates the type of the parent
|
|
device (e.g. MMC, Ethernet).
|
|
|
|
Name:
|
|
Name of the bootdev. This is generated from the media device appended
|
|
with `.bootdev`
|
|
|
|
|
|
bootdev select
|
|
~~~~~~~~~~~~~~~~~
|
|
|
|
Use this to select a particular bootdev. You can select it by the sequence
|
|
number or name, as shown in `bootdev list`.
|
|
|
|
Once a bootdev is selected, you can use `bootdev info` to look at it or
|
|
`bootflow scan` to scan it.
|
|
|
|
If no bootdev name or number is provided, then any existing bootdev is
|
|
unselected.
|
|
|
|
|
|
bootdev info
|
|
~~~~~~~~~~~~~~~
|
|
|
|
This shows information on the current bootdev, with the format looking like
|
|
this:
|
|
|
|
========= =======================
|
|
Name mmc@7e202000.bootdev
|
|
Sequence 0
|
|
Status Probed
|
|
Uclass mmc
|
|
Bootflows 1 (1 valid)
|
|
========= =======================
|
|
|
|
Most of the information is the same as `bootdev list` above. The new fields
|
|
are:
|
|
|
|
Device
|
|
Name of the bootdev
|
|
|
|
Status
|
|
Shows `Probed` if the device is probed, `OK` if not. If `-p` is used and the
|
|
device fails to probe, an error code is shown.
|
|
|
|
Bootflows
|
|
Indicates the number of bootflows attached to the bootdev. This is 0
|
|
unless you have used 'bootflow scan' on the bootflow, or on all bootflows.
|
|
|
|
|
|
Example
|
|
-------
|
|
|
|
This example shows listing available bootdev and getting information about
|
|
one of them::
|
|
|
|
U-Boot> bootdev list
|
|
Seq Probed Status Uclass Name
|
|
--- ------ ------ -------- ------------------
|
|
0 [ + ] OK mmc mmc@7e202000.bootdev
|
|
1 [ ] OK mmc sdhci@7e300000.bootdev
|
|
2 [ ] OK ethernet smsc95xx_eth.bootdev
|
|
--- ------ ------ -------- ------------------
|
|
(3 devices)
|
|
U-Boot> bootdev sel 0
|
|
U-Boot> bootflow scan
|
|
U-Boot> bootdev info
|
|
Name: mmc@7e202000.bootdev
|
|
Sequence: 0
|
|
Status: Probed
|
|
Uclass: mmc
|
|
Bootflows: 1 (1 valid)
|
|
|
|
|
|
Return value
|
|
------------
|
|
|
|
The return value $? is always 0 (true).
|