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CONFIG_USB_GADGET_DUMMY_HCD: Dummy HCD (DEVELOPMENT)

General informations

The Linux kernel configuration item CONFIG_USB_GADGET_DUMMY_HCD:

Help text

This host controller driver emulates USB, looping all data transfer requests back to a USB "gadget driver" in the same host. The host side is the master; the gadget side is the slave. Gadget drivers can be high, full, or low speed; and they have access to endpoints like those from NET2280, PXA2xx, or SA1100 hardware.

This may help in some stages of creating a driver to embed in a Linux device, since it lets you debug several parts of the gadget driver without its hardware or drivers being involved.

Since such a gadget side driver needs to interoperate with a host side Linux-USB device driver, this may help to debug both sides of a USB protocol stack.

Say "y" to link the driver statically, or "m" to build a dynamically linked module called "dummy_hcd" and force all gadget drivers to also be dynamically linked.

Hardware

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