Add USB CDC_NCM device driver and gadget driver to L2.6.35_11.09.01_ER BSP -blog archive

[qiang_li-mpu_se]

    USB NCM driver was supported from Linux 3.0 kernel, attached patch "usb_cdc_ncm.patch" is a back porting for USB CDC NCM support from Linux 3.1.5 kernel.

    For LTIB BSP L2.6.35_11.09.01_ER, after applied the patch, we need config the kernel to select the USB NCM driver for both host and gadget.

    In my test, I used two iMX boards, one works as USB host, another works as the USB NCM gadget.

Original Attachment has been moved to: usb_cdc_ncm.patch.zip

[1130692457]

hi , Qiang Li

Now I want to use PC as the HOST and i.mx6 as the device, but when I set it as follows, the driver appears on the i.mx6 board, but it cannot be recognized when using the OTG interface to connect。

[pfsang]

hi , Qiang Li

       if i want to support usb_cdc_ncm, should i support the following modules?

CONFIG_USB_USBNET, CONFIG_USB_NET_CDC_NCM, CONFIG_USB_GADGET

USB Gadget Drivers, CONFIG_USB_ETH, CONFIG_USB_G_NCM.

      and could I enable these driver as "M"?

      if i enable them as the build-in,  should I register them in board_mx6q_xxxx.c?

B&R

peter.cao

[qiang_li-mpu_se]

Yes, you can select them to support NCM, no modification was needed in board file.

[tollerhecht]

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[pfsang]

hi,  Qiang Li

    thank you for your reply.

    i configured CONFIG_USB_USBNET, CONFIG_USB_NET_CDC_NCM, CONFIG_USB_GADGET to "Y"

    and CONFIG_USB_ETH, CONFIG_USB_G_NCM to "M"

    so i just found the g_ether.ko, but didn't find the g_ncm.ko.

    do you have encountered the issue?

    if you are convenient,  could you give me your  ".config" and configuration of the usb ?

thanks

peter.cao

[LoicDomaigne]

Hi Qiang,

Thanks for your kind answer! 

I had overlooked the J3 connector. The setup worked fine ( i.MX53 with gadget driver and a host with the standard NCM driver ).

Cheers, Loïc

[qiang_li-mpu_se]

I used a normal micro-B to standard-A cable, this cable is also used to connect the iMX board with PC.

On Freescale board, the OTG port is a micro-AB connector. I haven't tried it with one board, I think if your board has both the USB OTG port and USB host port, you can try it.

[kajalsabhani]

hello Qiang,

Can you tell me how you have setup for iMX board with PC for USB host and gadget?

which drivers are required for board and for PC?

and what is dmesg log on board and pc to verify proper connection is established between board and PC or not?

[LoicDomaigne]

Hi Qiang,

thanks for your patch!

I am too interested in the setup that you have described for testing purposes (two i.MX boards, one working as host and the other as device using the gadget). I have one question, though: what kind of USB cable are you using for connecting the two boards? An USB A/A male, right?

Do you see any possibility to use only one board, maybe with the help of dummy_hcd ?

TIA, Loïc