[coreboot] Re: teensy_debugdev: Can we make this USB EHCI debug jig work?

[Felix Held]

Hi Keith!
> Did I miss something? How can we make this work?

It won't work, since the ATMega32u4 only supports 1.5 and 12 MBit/s USB, 
but an EHCI debug dongle needs to support 480 MBit/s mode or it won't 
work. That's also why the ft(2)232h works as a slightly out-of-spec EHCI 
debug device (coreboot has some code to deal with it being slightly out 
of spec for an EHCI debug device), but the non h versions don't.

Regards
Felix