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