[nycbug-talk] Soekris/PCEngines-ALIX USB Bug

Miles Nordin carton at Ivy.NET
Fri Aug 8 14:21:44 EDT 2008

AIUI, disabling ehci just makes it usb 1.x speed.

If you look at how the ports attach, usb 2.0 controllers pretend to be
two chips, a 2.0 controller and a 1.x controller.  They then pervert
the tree of controllers, hubs, hubs, devices before presenting it to
the drivers.  Depending on the speed of the device plugged to a single
port, that device will appear to attach to the hub tree rooted at
either one controller or the other.

I think it is weirder than that, or not exactly as I've said.  The two
sides are not mirror images.  On one side they pretend to be one
controller with a 4-port hub attached, and on the other side to be 4
controllers with no hub attached.  :/

i don't know why the Central Committe Controlling USB pulled all this
nonsense.  maybe it helps the keyboard work at boot without forcing
the chinese to rewrite their fragile BIOS's?
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