Messages in this thread | | | From | David Brownell <> | Subject | Re: [linux-usb-devel] [PATCH] : Allow embedded developers USB options normally reserved for OTG | Date | Wed, 2 Jan 2008 11:16:28 -0800 |
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On Wednesday 02 January 2008, Mike Frysinger wrote: > > > > > > Allow embedded developers to turn support for USB Hubs off even if they have a > > > full root hub. This saves the overhead (RAM and Flash size). > > > > ISTR that it won't save very much code though ... the Linux USB > > stack structures all its enumeration logic around hubs. > > 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.)
Well, it won't work with *external* hubs. Root hubs are a different story. :)
I think that's one of a class of decisions sometimes made by folk who need to conserve silicon real estate. Supporting external hubs has always been optional for OTG systems.
- Dave
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