Subject: Re: USB 2.0 support - problems?
To: Lennart Augustsson <>
From: Jaromir Dolecek <>
List: tech-kern
Date: 01/06/2004 21:15:58
Lennart Augustsson wrote:
> The EHCI driver lacks support for interrupt isochronous transfers.
> Interrupt transfers are not difficult, it's just not done.

What does this mean? Certain devices not working, devices
randomly locking, or kernel panic?

> There might also be some issues with the data toggle, I never
> managed to test if that works properly under all conditions.

What effect would have an incorrectly cleared/pending data toggle?
> The meaty part to implement is the support for USB 2.0 hubs.
> They are quite compolicated since the need to be able to do
> "transaction translation", i.e., converting to/from USB 2 and USB 1.
> So the hub driver needs to handle and schedule these things.

I somehow thought this is done by the hardware. Why would
the driver need to be involved?
Jaromir Dolecek <>  
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