Re: [linux-usb-devel] [PATCH] : Allow embedded developers USB optionsnormally reserved for OTG

[Alan Stern]

On Wed, 2 Jan 2008, Mike Frysinger wrote:

> perhaps the code size is arguable as to whether it really matters.
> the reason we want it is that we have a USB host controller that will
> not work with USB hubs, so we want to make sure the system does not
> attempt such things.  (yes, such a USB host controller is retarded,
> but the decision was out of our hands.)

Just out of curiosity, how does a host controller manage to avoid
working with external hubs?  Is it a matter of power consumption?  It
seems to me that in all other respects a hub should appear the same as
any other USB device.

Or is it a question of whether the controller works when communicating 
with devices behind an external hub?  And if it is, what is the 
difficulty?

Alan Stern

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