58 lines
1.2 KiB
ReStructuredText
58 lines
1.2 KiB
ReStructuredText
.. SPDX-License-Identifier: GPL-2.0+
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ums command
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===========
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Synopsis
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--------
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::
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ums <dev> [<interface>] <devnum[:partnum]>
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Description
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-----------
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Use the USB Mass Storage class (also known as UMS) to make accessible an U-Boot
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block device (fully or with :ref:`U-Boot's partition syntax <partitions>`)
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to a USB host and to enable file transfers. U-Boot, the USB device, acts as a
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simple external hard drive plugged on the host USB port.
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This command "ums" stays in the USB's treatment loop until user enters Ctrl-C.
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dev
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USB gadget device number
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interface
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interface for accessing the block device (mmc, sata, scsi, usb, ....)
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defaults is "mmc"
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devnum
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device number for selected interface
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partnum
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partition number or 0 to expose all partitions, defaults to 0
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Example
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-------
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::
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=> ums 0 mmc 0
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=> ums 0 usb 1:2
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Configuration
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-------------
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The ums command is only available if CONFIG_CMD_USB_MASS_STORAGE=y
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and depends on CONFIG_USB_USB_GADGET and CONFIG_BLK.
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Return value
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------------
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The return value $? is set to 0 (true) when the USB stack was successfully
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started and interrupted, with Ctrl-C or after USB cable issue (detection
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timeout or cable removal).
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If an error occurs, the return value $? is set to 1 (false).
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