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