how to enable OTG(as device function) in i.MX25

[tomfang]

Hi,

currently, i want to enable OTG as device function in i.MX25 platform, kernel is linux-2.6.31 in your L2.6.31_09.12.01_SDK_source,

but in the menuconfig, i didn't find the option of it, it seems that it is forbidden, because configuration options is "*** OTG and related infrastructure ***"

under "USB support".

second, if we suppose we can enable OTG, i glanced at the Kconfig and Make under "linux-2.6.31/drivers/usb/otg",

i'm not sure whether we need configure "CONFIG_UTMI_MXC_OTG", because there is fsl_otg_arc.c which is needed by "CONFIG_UTMI_MXC_OTG".

if i can't enable OTG in linux kernel, Can you supply me another way to embedded OTG function in linux as soon as possible?

Thanks from heart!

[Yuri]

To enable the USB2.0 OTG, configure ltib menuconfig (command ltib -c) to

configure the kernel marking [*]Configure the kernel.

On Kernel configuration, mark the options:

  Device Drivers

<*> USB Support

<M> EHCI HCD (USB 2.0) support

     [*]   Support for Freescale controller

     [*]   Support for DR host port on Freescale controller

            Select transceiver for DR port (Internal UTMI)  --->

On i.MX25 target system load the fsl_otg_arc and ehci_hcd (if host mode needed) modules:

$ modprobe fsl_otg_arc

$ modprobe ehci_hcd

[tomfang]

Yuri Muhin,

Why there isn't fsl_otg_arc.c in "linux-2.6.31/drivers/usb/otg", but Makefile have it(previous attached picture),

and i built kernel successfully as your suggestion, it didn't generate fsl_otg_arc.o or fsl_otg_arc.ko, so the target board display:

root@freescale /$ modprobe fsl_otg_arc

modprobe: module fsl_otg_arc not found in modules.dep

[Yuri]

Pleased try to prepare Linux kernel files via LTIB :

$ ./ltib -p kernel -m prep

[tomfang]

Thanks Yuri Muhin,

i did it, but i have a puzzle, it seems that your configuration is OTG working as USB host, but i need OTG as USB device.

my configuration is:

  Device Drivers

<*> USB Support

<M> Support for Host-side USB

<M> EHCI HCD (USB 2.0) support

              [*]   Support for Freescale controller

              [*]   Support for DR host port on Freescale controller

                    Select transceiver for DR port (Internal UTMI)  --->

<*>   USB Gadget Support  --->

       [*]   Support for DR peripheral port on Freescale controller

             Select transceiver for DR port (On-chip UTMI)  --->

       [*] OTG Support

      <M> Gadget Filesystem (EXPERIMENTAL)

Can you help me to check this configuration?

thanks Yuri again!

[Yuri]

To enable the USB2.0 OTG (connector J10) for Ethernet Gadget, configure ltib menuconfig (command ltib -c)

and mark “[*]Configure the kernel”. On Kernel configuration, mark the options:

                 Device Drivers

<*> USB Support

<*> EHCI HCD (USB 2.0) support

[*] Support for Freescale controller

                                            Support for DR host port on Freescale controller

                                            USB Gadget Drivers --->

                                                [*]    Support for DR peripheral port on Freescale controller

                                                         Select transceiver for DR port (On-chip UTMI)  --->

                                                <M> Ethernet Gadget (with CDC Ethernet support)

For tests :

Connect a USB cable to PC and USB Host OTG (J10 connector) on I.MX25 Board.

Load the g_ether module:

$ modprobe fsl_otg_arc

$ modprobe arcotg_udc

$ modprobe g_ether

Configure host ethernet by typing on host:

$ ifconfig usb0 192.168.0.1

Configure target ethernet by typing on target:

$ ifconfig usb0 192.168.0.2