Re: [Gumstix-users] USB OTG not working as host

[joe j. <joe...@qi...>]

zachlac wrote:
> 
> I believe the OTG cable is actually micro-AB to mini-B.  You MUST use this
> cable type for OTG to work.
> 
> I got in the powered hub yesterday, and it works great.  I think you might
> have to have at least one device plugged into the hub on boot, and the hub
> definitely must be plugged into the OTG port, but other than that you can
> hot-swap devices on the hub without problems.
> 
> I did nt have to mess with the kernel at all.  To quote an above post, "it
> should just work".  One thing to note: the ports are EHCI only, meaning
> you must use only High-Speed USB devices if connecting directly to the
> port.  Using a hub has been said to fix this problem.
> 
> -Zach
> 
> 
> kebgc wrote:
>> 
>> Where are the specifications for the USB ports, I've looked at the WIKI
>> pages and on gumstix.net but I can't see it.
>> I'm trying to get a USB 3G/HSDPA modem working without a hub. I want to
>> make sure that I'll definitely need a powered hub. 
>> 
>> These are my MUSB kernel settings, should these support the OTG port as a
>> hub:
>> CONFIG_USB_MUSB_HDRC=y
>> CONFIG_USB_MUSB_SOC=y
>> # CONFIG_USB_MUSB_HOST is not set
>> # CONFIG_USB_MUSB_PERIPHERAL is not set
>> CONFIG_USB_MUSB_OTG=y
>> # CONFIG_USB_GADGET_MUSB_HDRC is not set
>> CONFIG_USB_MUSB_HDRC_HCD=y
>> # CONFIG_MUSB_PIO_ONLY is not set
>> CONFIG_USB_MUSB_DEBUG=y
>> 
>> ALSO anyone got a spec for the OTG cable mentioned earlier, can't see one
>> available on GUMSTIX, if its non-standard mini-A to mini-B ??
>> 
>> Benny B. Simonsen wrote:
>>> 
>>> Steve Sakoman skrev:
>>>> On Thu, Jan 7, 2010 at 12:46 PM, zachlac <zla...@gm...> wrote:
>>>>   
>>>>> I'd like to have two free USB ports, the normal Host port and the OTG
>>>>> port as
>>>>> a second host port.  The first host port works properly, but when I
>>>>> plug a
>>>>> slave device into the OTG port, nothing happens.  No messages on
>>>>> dmesg.
>>>>> It's configured in the kernel as Host through the
>>>>> linux-omap3-2.6.31.bb
>>>>> recipe.  Is there a module I need to load?  I'm using the Overo Water
>>>>> with
>>>>> the Tobi board.
>>>>>     
>>>>
>>>> On the musb (OTG) port devices must be plugged in at boot time to be
>>>> recognized -- hot plug is not yet functional.
>>>>
>>>> I believe that this should be fixed in the 2.6.33 musb driver, but I
>>>> haven't verified that yet.
>>>>
>>>> Steve
>>>>
>>>>   
>>> Steve,
>>> 
>>> Are you sure that it's not the host port which have hot plug problems?
>>> On the OTG port (in permanent host mode) I have tried to plug / unplug 
>>> an USB mouse (connected through a HUB) as fast as possible for 1 minut 
>>> without problems.
>>> 
>>> On the host port I got this with the same setup and one unplug / plug
>>> cycle
>>> -----------------------------------
>>> usb 2-2.1: USB disconnect, address 3
>>> ehci-omap ehci-omap.0: port 2 reset error -110
>>> hub 2-0:1.0: hub_port_status failed (err = -32)
>>> usb 2-2: USB disconnect, address 2
>>> hub 2-0:1.0: unable to enumerate USB device on port 2
>>> -----------------------------------
>>> 
>>> Benny
>>> 
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>>> 
>> Somebody mentioned that I should use a micro-AB to mini-B cable to
>> properly use the USB OTG.  What end should I use to connect to the Summit
>> expansion board OTG port?  I'm confused because the OTG port on the
>> Summit looks different than the host port, which is a mini-B. If mini-B
>> is what its supposed to use, why can't a normal mini-B to USB A work?     
>>    
>> 
> 
> 

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