Re: Using USB1.1 device on USB 2.0 Hub on an ARM board

On Tuesday 01 January 2008, Joyious He wrote:
>
> I have check some USB related infomation. I am using 2.6.10 linux kernel
> and on the board it does not have a OHCI or UHCI controller there.In
> kernel config i have enable the options below:
> 
> │ │           <*> EHCI HCD (USB 2.0) support
> │ │           [*]   Support for ARC controller
> │ │           [ ]     Support for Host1 port on ARC controller
> │ │           [ ]     Support for Host2 port on ARC controller
> │ │           [*]     Support for OTG HS Host port on ARC controller
> │ │           [*]   Full speed ISO transactions (EXPERIMENTAL)
> │ │           [*]   Root Hub Transaction Translators (EXPERIMENTAL)             
> 
> but i do not know the details for all of this, could you just give me
> more info about this issue ?

You should get this information from the folk who provided you with such
a heavily patched 2.6.10 kernel.  All those "ARC controller" options were
provided by those patches ... they've never even been submitted for the
mainstream kernel.  Who knows what else they changed...

That said, one part of the issue is that 2.6.10 is quite old by now,
and your audio input is using that "Full speed ISO transactions" code.
And that code has changed in various ways since then, ISTR in part to
make input work better.  I've seen 2.6.18 kernels doing both audio and
video input from full speed devices, with (I'm told) minimal patches.

So maybe you'll have better luck if you get your vendor to provide you
a more current kernel.  (Which may be an issue for iMX.31 of course.)

- Dave

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