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"Das U-Boot" Source Tree
1.. SPDX-License-Identifier: GPL-2.0+:
2
3.. index::
4 single: bootdev (command)
5
6bootdev command
7===============
8
9Synopsis
10--------
11
12::
13
14 bootdev list [-p] - list all available bootdevs (-p to probe)
15 bootdev hunt [-l|<spec>] - use hunt drivers to find bootdevs
16 bootdev select <bm> - select a bootdev by name
17 bootdev info [-p] - show information about a bootdev
18
19Description
20-----------
21
22The `bootdev` command is used to manage bootdevs. It can list available
23bootdevs, select one and obtain information about it.
24
25See :doc:`/develop/bootstd/index` for more information about bootdevs in general.
26
27
28bootdev list
29~~~~~~~~~~~~
30
31This lists available bootdevs
32
33Scanning with `-p` causes the bootdevs to be probed. This happens automatically
34when they are used.
35
36The list looks something like this:
37
38=== ====== ====== ======== =========================
39Seq Probed Status Uclass Name
40=== ====== ====== ======== =========================
41 0 [ + ] OK mmc mmc@7e202000.bootdev
42 1 [ ] OK mmc sdhci@7e300000.bootdev
43 2 [ ] OK ethernet smsc95xx_eth.bootdev
44=== ====== ====== ======== =========================
45
46
47The fields are as follows:
48
49Seq:
50 Sequence number in the scan, used to reference the bootflow later
51
52Probed:
53 Shows a plus (+) if the device is probed, empty if not.
54
55Status:
56 Shows the status of the device. Typically this is `OK` meaning that there is
57 no error. If you use -p and an error occurs when probing, then this shows
58 the error number. You can look up Linux error codes to find the meaning of
59 the number.
60
61Uclass:
62 Name of the media device's Uclass. This indicates the type of the parent
63 device (e.g. MMC, Ethernet).
64
65Name:
66 Name of the bootdev. This is generated from the media device appended
67 with `.bootdev`
68
69
70bootdev hunt
71~~~~~~~~~~~~
72
73This hunts for new bootdevs, or shows a list of hunters.
74
75Use `-l` to list the available bootdev hunters.
76
77To run hunters, specify the name of the hunter to run, e.g. "mmc". If no
78name is provided, all hunters are run.
79
80
81bootdev select
82~~~~~~~~~~~~~~
83
84Use this to select a particular bootdev. You can select it by the sequence
85number or name, as shown in `bootdev list`.
86
87Once a bootdev is selected, you can use `bootdev info` to look at it or
88`bootflow scan` to scan it.
89
90If no bootdev name or number is provided, then any existing bootdev is
91unselected.
92
93
94bootdev info
95~~~~~~~~~~~~
96
97This shows information on the current bootdev, with the format looking like
98this:
99
100========= =======================
101Name `mmc@7e202000.bootdev`
102Sequence 0
103Status Probed
104Uclass mmc
105Bootflows 1 (1 valid)
106========= =======================
107
108Most of the information is the same as `bootdev list` above. The new fields
109are:
110
111Device
112 Name of the bootdev
113
114Status
115 Shows `Probed` if the device is probed, `OK` if not. If `-p` is used and the
116 device fails to probe, an error code is shown.
117
118Bootflows
119 Indicates the number of bootflows attached to the bootdev. This is 0
120 unless you have used 'bootflow scan' on the bootflow, or on all bootflows.
121
122
123Example
124-------
125
126This example shows listing available bootdev and getting information about
127one of them::
128
129 U-Boot> bootdev list
130 Seq Probed Status Uclass Name
131 --- ------ ------ -------- ------------------
132 0 [ + ] OK mmc mmc@7e202000.bootdev
133 1 [ ] OK mmc sdhci@7e300000.bootdev
134 2 [ ] OK ethernet smsc95xx_eth.bootdev
135 --- ------ ------ -------- ------------------
136 (3 devices)
137 U-Boot> bootdev sel 0
138 U-Boot> bootflow scan
139 U-Boot> bootdev info
140 Name: mmc@7e202000.bootdev
141 Sequence: 0
142 Status: Probed
143 Uclass: mmc
144 Bootflows: 1 (1 valid)
145
146This shows using one of the available hunters, then listing them::
147
148 => bootdev hunt usb
149 Hunting with: usb
150 Bus usb@1: scanning bus usb@1 for devices...
151 3 USB Device(s) found
152 => bootdev hunt -l
153 Prio Used Uclass Hunter
154 ---- ---- --------------- ---------------
155 6 ethernet eth_bootdev
156 1 simple_bus (none)
157 5 ide ide_bootdev
158 2 mmc mmc_bootdev
159 4 nvme nvme_bootdev
160 4 scsi scsi_bootdev
161 4 spi_flash sf_bootdev
162 5 * usb usb_bootdev
163 4 virtio virtio_bootdev
164 (total hunters: 9)
165 => usb stor
166 Device 0: Vendor: sandbox Rev: 1.0 Prod: flash
167 Type: Hard Disk
168 Capacity: 4.0 MB = 0.0 GB (8192 x 512)
169 Device 1: Vendor: sandbox Rev: 1.0 Prod: flash
170 Type: Hard Disk
171 Capacity: 0.0 MB = 0.0 GB (1 x 512)
172 =>
173
174
175Return value
176------------
177
178The return value $? is always 0 (true).