Re: Making flash appear as USB device

On Fri, 19 Oct 2007, Midhun A wrote:

> Hi All,
> 
>    I have i.MX21 based kit and it has a USB device port. I want the
> kit's flash to be seen as a USB storage device when I connect it to my
> PC though the USB device port. As the kit has a NOR flash only, I
> plugged in a flash drive into the kit (sda1) - hoping to access it
> though the device port from my PC.
> 
>   So I compiled the 2.6.22 kernel with USB_GADGET and
> USB_FILE_STORAGE. The config file is as follows:
> 
> #
> # USB Gadget Support
> #
> CONFIG_USB_GADGET=m
> # CONFIG_USB_GADGET_DEBUG_FILES is not set
> CONFIG_USB_GADGET_SELECTED=y
> # CONFIG_USB_GADGET_FSL_USB2 is not set
> # CONFIG_USB_GADGET_NET2280 is not set
> # CONFIG_USB_GADGET_PXA2XX is not set
> # CONFIG_USB_GADGET_GOKU is not set
> # CONFIG_USB_GADGET_LH7A40X is not set
> # CONFIG_USB_GADGET_OMAP is not set
> # CONFIG_USB_GADGET_AT91 is not set
> CONFIG_USB_GADGET_DUMMY_HCD=y
> CONFIG_USB_DUMMY_HCD=m

>  Now when I plug in the kit to my PC, my PC does not detect it. What
> is it that is going  wrong or am I missing something?

Your problem is that you are using dummy-hcd.  That's not a real device 
controller; it is only an emulator.  You need to use a device 
controller appropriate for the i.MX21.

Alan Stern


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