2022-05-08 10:39:22 +00:00
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.. SPDX-License-Identifier: GPL-2.0+:
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dm command
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==========
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Synopis
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-------
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::
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dm compat
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dm devres
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dm drivers
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dm static
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2023-01-17 17:47:12 +00:00
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dm tree [-s]
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2022-05-08 10:39:22 +00:00
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dm uclass
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Description
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-----------
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The *dm* command allows viewing information about driver model, including the
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tree of devices and list of available uclasses.
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dm compat
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~~~~~~~~~
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This shows the compatible strings associated with each driver. Often there
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is only one, but multiple strings are shown on their own line. These strings
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can be looked up in the device tree files for each board, to see which driver is
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used for each node.
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dm devres
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~~~~~~~~~
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This shows a list of a `devres` (device resource) records for a device. Some
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drivers use the devres API to allocate memory, so that it can be freed
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automatically (without any code needed in the driver's remove() method) when the
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device is removed.
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This feature is controlled by CONFIG_DEVRES so no useful output is obtained if
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this option is disabled.
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dm drivers
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~~~~~~~~~~
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This shows all the available drivers, their uclass and a list of devices that
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use that driver, each on its own line. Drivers with no devices are shown with
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`<none>` as the driver name.
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dm mem
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~~~~~~
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This subcommand is really just for debugging and exploration. It can be enabled
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with the `CONFIG_DM_STATS` option.
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All output is in hex except that in brackets which is decimal.
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The output consists of a header shows the size of the main device model
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structures (struct udevice, struct driver, struct uclass and struct uc_driver)
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and the count and memory used by each (number of devices, memory used by
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devices, memory used by device names, number of uclasses, memory used by
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uclasses).
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After that is a table of information about each type of data that can be
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attached to a device, showing the number that have non-null data for that type,
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the total size of all that data, the amount of memory used in total, the
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amount that would be used if this type uses tags instead and the amount that
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would be thus saved.
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The `driver_data` line shows the number of devices which have non-NULL driver
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data.
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The `tags` line shows the number of tags and the memory used by those.
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At the bottom is an indication of the total memory usage obtained by undertaking
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various changes, none of which is currently implemented in U-Boot:
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With tags
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Using tags instead of all attached types
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Singly linked
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Using a singly linked list
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driver index
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Using a driver index instead of a pointer
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uclass index
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Using a uclass index instead of a pointer
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Drop device name
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Using empty device names
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dm static
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~~~~~~~~~
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This shows devices bound by platform data, i.e. not from the device tree. There
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are normally none of these, but some boards may use static devices for space
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reasons.
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dm tree
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~~~~~~~
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This shows the full tree of devices including the following fields:
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uclass
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Shows the name of the uclass for the device
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Index
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Shows the index number of the device, within the uclass. This shows the
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ordering within the uclass, but not the sequence number.
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Probed
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Shows `+` if the device is active
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Driver
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Shows the name of the driver that this device uses
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Name
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Shows the device name as well as the tree structure, since child devices are
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shown attached to their parent.
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2023-01-17 17:47:12 +00:00
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If -s is given, the top-level devices (those which are children of the root
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device) are shown sorted in order of uclass ID, so it is easier to find a
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particular device type.
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2022-05-08 10:39:22 +00:00
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dm uclass
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~~~~~~~~~
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This shows each uclass along with a list of devices in that uclass. The uclass
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ID is shown (e.g. uclass 7) and its name.
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For each device, the format is::
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n name @ a, seq s
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where `n` is the index within the uclass, `a` is the address of the device in
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memory and `s` is the sequence number of the device.
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Examples
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--------
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dm compat
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~~~~~~~~~
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This example shows an abridged version of the sandbox output::
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=> dm compat
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Driver Compatible
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--------------------------------
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act8846_reg
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sandbox_adder sandbox,adder
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axi_sandbox_bus sandbox,axi
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blk_partition
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bootcount-rtc u-boot,bootcount-rtc
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...
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rockchip_rk805 rockchip,rk805
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rockchip,rk808
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rockchip,rk809
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rockchip,rk816
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rockchip,rk817
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rockchip,rk818
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root_driver
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rtc-rv8803 microcrystal,rv8803
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epson,rx8803
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epson,rx8900
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...
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wdt_gpio linux,wdt-gpio
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wdt_sandbox sandbox,wdt
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dm devres
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~~~~~~~~~
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This example shows an abridged version of the sandbox test output (running
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U-Boot with the -T flag)::
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=> dm devres
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- root_driver
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- demo_shape_drv
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- demo_simple_drv
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- demo_shape_drv
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...
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- h-test
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- devres-test
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00000000130194e0 (100 byte) devm_kmalloc_release BIND
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- another-test
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...
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- syscon@3
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- a-mux-controller
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0000000013025e60 (96 byte) devm_kmalloc_release PROBE
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0000000013025f00 (24 byte) devm_kmalloc_release PROBE
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0000000013026010 (24 byte) devm_kmalloc_release PROBE
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0000000013026070 (24 byte) devm_kmalloc_release PROBE
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00000000130260d0 (24 byte) devm_kmalloc_release PROBE
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- syscon@3
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- a-mux-controller
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0000000013026150 (96 byte) devm_kmalloc_release PROBE
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00000000130261f0 (24 byte) devm_kmalloc_release PROBE
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0000000013026300 (24 byte) devm_kmalloc_release PROBE
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0000000013026360 (24 byte) devm_kmalloc_release PROBE
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00000000130263c0 (24 byte) devm_kmalloc_release PROBE
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- emul-mux-controller
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0000000013025fa0 (32 byte) devm_kmalloc_release PROBE
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- testfdtm0
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- testfdtm1
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...
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- pinmux_spi0_pins
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- pinmux_uart0_pins
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- pinctrl-single-bits
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0000000013229180 (320 byte) devm_kmalloc_release PROBE
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0000000013229300 (40 byte) devm_kmalloc_release PROBE
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0000000013229370 (160 byte) devm_kmalloc_release PROBE
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000000001322c190 (40 byte) devm_kmalloc_release PROBE
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000000001322c200 (32 byte) devm_kmalloc_release PROBE
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- pinmux_i2c0_pins
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...
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- reg@0
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- reg@1
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dm drivers
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~~~~~~~~~~
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This example shows an abridged version of the sandbox output::
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=> dm drivers
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Driver uid uclass Devices
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----------------------------------------------------------
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act8846_reg 087 regulator <none>
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sandbox_adder 021 axi adder
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adder
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axi_sandbox_bus 021 axi axi@0
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...
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da7219 061 misc <none>
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demo_shape_drv 001 demo demo_shape_drv
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demo_shape_drv
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demo_shape_drv
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demo_simple_drv 001 demo demo_simple_drv
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demo_simple_drv
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testfdt_drv 003 testfdt a-test
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b-test
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d-test
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e-test
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f-test
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g-test
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another-test
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chosen-test
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testbus_drv 005 testbus some-bus
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mmio-bus@0
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mmio-bus@1
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dsa-port 039 ethernet lan0
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lan1
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dsa_sandbox 035 dsa dsa-test
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eep_sandbox 121 w1_eeprom <none>
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...
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pfuze100_regulator 087 regulator <none>
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phy_sandbox 077 phy bind-test-child1
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gen_phy@0
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gen_phy@1
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gen_phy@2
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pinconfig 078 pinconfig gpios
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gpio0
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gpio1
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gpio2
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gpio3
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i2c
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groups
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pins
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i2s
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spi
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cs
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pinmux_pwm_pins
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pinmux_spi0_pins
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pinmux_uart0_pins
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pinmux_i2c0_pins
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pinmux_lcd_pins
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pmc_sandbox 017 power-mgr pci@1e,0
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act8846 pmic 080 pmic <none>
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max77686_pmic 080 pmic <none>
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mc34708_pmic 080 pmic pmic@41
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...
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wdt_gpio 122 watchdog gpio-wdt
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wdt_sandbox 122 watchdog wdt@0
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=>
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dm mem
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~~~~~~
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This example shows the sandbox output::
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> dm mem
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Struct sizes: udevice b0, driver 80, uclass 30, uc_driver 78
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Memory: device fe:aea0, device names a16, uclass 5e:11a0
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Attached type Count Size Cur Tags Save
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--------------- ----- ----- ----- ----- -----
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plat 45 a8f aea0 a7c4 6dc (1756)
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parent_plat 1a 3b8 aea0 a718 788 (1928)
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uclass_plat 3d 6b4 aea0 a7a4 6fc (1788)
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priv 8a 68f3 aea0 a8d8 5c8 (1480)
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parent_priv 8 38a0 aea0 a6d0 7d0 (2000)
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uclass_priv 4e 14a6 aea0 a7e8 6b8 (1720)
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driver_data f 0 aea0 a6ec 7b4 (1972)
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uclass 6 20
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Attached total 191 cb54 3164 (12644)
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tags 0 0
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Total size: 18b94 (101268)
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With tags: 15a30 (88624)
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- singly-linked: 14260 (82528)
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- driver index: 13b6e (80750)
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- uclass index: 1347c (78972)
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Drop device name (not SRAM): a16 (2582)
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=>
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dm static
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~~~~~~~~~
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This example shows the sandbox output::
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=> dm static
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Driver Address
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---------------------------------
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demo_shape_drv 0000562edab8dca0
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demo_simple_drv 0000562edab8dca0
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demo_shape_drv 0000562edab8dc90
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demo_simple_drv 0000562edab8dc80
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demo_shape_drv 0000562edab8dc80
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test_drv 0000562edaae8840
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test_drv 0000562edaae8848
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test_drv 0000562edaae8850
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sandbox_gpio 0000000000000000
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mod_exp_sw 0000000000000000
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sandbox_test_proc 0000562edabb5330
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qfw_sandbox 0000000000000000
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sandbox_timer 0000000000000000
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sandbox_serial 0000562edaa8ed00
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sysreset_sandbox 0000000000000000
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dm tree
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-------
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This example shows the abridged sandbox output::
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=> dm tree
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Class Index Probed Driver Name
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-----------------------------------------------------------
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root 0 [ + ] root_driver root_driver
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demo 0 [ ] demo_shape_drv |-- demo_shape_drv
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demo 1 [ ] demo_simple_drv |-- demo_simple_drv
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demo 2 [ ] demo_shape_drv |-- demo_shape_drv
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demo 3 [ ] demo_simple_drv |-- demo_simple_drv
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demo 4 [ ] demo_shape_drv |-- demo_shape_drv
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test 0 [ ] test_drv |-- test_drv
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test 1 [ ] test_drv |-- test_drv
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test 2 [ ] test_drv |-- test_drv
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..
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sysreset 0 [ ] sysreset_sandbox |-- sysreset_sandbox
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bootstd 0 [ ] bootstd_drv |-- bootstd
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bootmeth 0 [ ] bootmeth_distro | |-- syslinux
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bootmeth 1 [ ] bootmeth_efi | `-- efi
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reboot-mod 0 [ ] reboot-mode-gpio |-- reboot-mode0
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reboot-mod 1 [ ] reboot-mode-rtc |-- reboot-mode@14
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...
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ethernet 7 [ + ] dsa-port | `-- lan1
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pinctrl 0 [ + ] sandbox_pinctrl_gpio |-- pinctrl-gpio
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gpio 1 [ + ] sandbox_gpio | |-- base-gpios
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nop 0 [ + ] gpio_hog | | |-- hog_input_active_low
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nop 1 [ + ] gpio_hog | | |-- hog_input_active_high
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nop 2 [ + ] gpio_hog | | |-- hog_output_low
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nop 3 [ + ] gpio_hog | | `-- hog_output_high
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gpio 2 [ ] sandbox_gpio | |-- extra-gpios
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gpio 3 [ ] sandbox_gpio | `-- pinmux-gpios
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i2c 0 [ + ] sandbox_i2c |-- i2c@0
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i2c_eeprom 0 [ ] i2c_eeprom | |-- eeprom@2c
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i2c_eeprom 1 [ ] i2c_eeprom_partition | | `-- bootcount@10
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rtc 0 [ ] sandbox_rtc | |-- rtc@43
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rtc 1 [ + ] sandbox_rtc | |-- rtc@61
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i2c_emul_p 0 [ + ] sandbox_i2c_emul_par | |-- emul
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i2c_emul 0 [ ] sandbox_i2c_eeprom_e | | |-- emul-eeprom
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i2c_emul 1 [ ] sandbox_i2c_rtc_emul | | |-- emul0
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i2c_emul 2 [ + ] sandbox_i2c_rtc_emul | | |-- emull
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i2c_emul 3 [ ] sandbox_i2c_pmic_emu | | |-- pmic-emul0
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i2c_emul 4 [ ] sandbox_i2c_pmic_emu | | `-- pmic-emul1
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pmic 0 [ ] sandbox_pmic | |-- sandbox_pmic
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regulator 0 [ ] sandbox_buck | | |-- buck1
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regulator 1 [ ] sandbox_buck | | |-- buck2
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regulator 2 [ ] sandbox_ldo | | |-- ldo1
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regulator 3 [ ] sandbox_ldo | | |-- ldo2
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regulator 4 [ ] sandbox_buck | | `-- no_match_by_nodename
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pmic 1 [ ] mc34708_pmic | `-- pmic@41
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bootcount 0 [ + ] bootcount-rtc |-- bootcount@0
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bootcount 1 [ ] bootcount-i2c-eeprom |-- bootcount
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...
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clk 4 [ ] fixed_clock |-- osc
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firmware 0 [ ] sandbox_firmware |-- sandbox-firmware
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scmi_agent 0 [ ] sandbox-scmi_agent `-- scmi
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clk 5 [ ] scmi_clk |-- protocol@14
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reset 2 [ ] scmi_reset_domain |-- protocol@16
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nop 8 [ ] scmi_voltage_domain `-- regulators
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regulator 5 [ ] scmi_regulator |-- reg@0
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regulator 6 [ ] scmi_regulator `-- reg@1
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=>
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dm uclass
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~~~~~~~~~
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This example shows the abridged sandbox output::
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=> dm uclass
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uclass 0: root
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0 * root_driver @ 03015460, seq 0
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uclass 1: demo
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0 demo_shape_drv @ 03015560, seq 0
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1 demo_simple_drv @ 03015620, seq 1
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2 demo_shape_drv @ 030156e0, seq 2
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3 demo_simple_drv @ 030157a0, seq 3
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4 demo_shape_drv @ 03015860, seq 4
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uclass 2: test
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0 test_drv @ 03015980, seq 0
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1 test_drv @ 03015a60, seq 1
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2 test_drv @ 03015b40, seq 2
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...
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uclass 20: audio-codec
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0 audio-codec @ 030168e0, seq 0
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uclass 21: axi
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0 adder @ 0301db60, seq 1
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1 adder @ 0301dc40, seq 2
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2 axi@0 @ 030217d0, seq 0
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uclass 22: blk
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0 mmc2.blk @ 0301ca00, seq 0
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1 mmc1.blk @ 0301cee0, seq 1
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2 mmc0.blk @ 0301d380, seq 2
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uclass 23: bootcount
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0 * bootcount@0 @ 0301b3f0, seq 0
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1 bootcount @ 0301b4b0, seq 1
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2 bootcount_4@0 @ 0301b570, seq 2
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3 bootcount_2@0 @ 0301b630, seq 3
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uclass 24: bootdev
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0 mmc2.bootdev @ 0301cbb0, seq 0
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1 mmc1.bootdev @ 0301d050, seq 1
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2 mmc0.bootdev @ 0301d4f0, seq 2
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...
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uclass 78: pinconfig
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0 gpios @ 03022410, seq 0
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1 gpio0 @ 030224d0, seq 1
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2 gpio1 @ 03022590, seq 2
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3 gpio2 @ 03022650, seq 3
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4 gpio3 @ 03022710, seq 4
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5 i2c @ 030227d0, seq 5
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6 groups @ 03022890, seq 6
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7 pins @ 03022950, seq 7
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8 i2s @ 03022a10, seq 8
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9 spi @ 03022ad0, seq 9
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10 cs @ 03022b90, seq 10
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11 pinmux_pwm_pins @ 03022e10, seq 11
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12 pinmux_spi0_pins @ 03022ed0, seq 12
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13 pinmux_uart0_pins @ 03022f90, seq 13
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14 * pinmux_i2c0_pins @ 03023130, seq 14
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15 * pinmux_lcd_pins @ 030231f0, seq 15
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...
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uclass 119: virtio
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0 sandbox_virtio1 @ 030220d0, seq 0
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1 sandbox_virtio2 @ 03022190, seq 1
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uclass 120: w1
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uclass 121: w1_eeprom
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uclass 122: watchdog
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0 * gpio-wdt @ 0301c070, seq 0
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1 * wdt@0 @ 03021710, seq 1
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=>
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