[LinuxBIOS] USB Support

Stefan Reinauer stepan at coresystems.de
Fri Jul 7 16:18:25 CEST 2006

* Stefan Reinauer <stepan at coresystems.de> [060707 15:25]:
> Eric pointed this out and I did not even notice what he was saying:
> EHCI has a workaround method called the "USB2 Debug port for legacy
> free machines"
> This debug port can be used by simple inb/outb sequences, not more
> complex than serial io.
> According to this document
> http://www.intel.com/technology/usb/download/DebugDeviceSpec_R090.pdf
> what you need is a debug device, which mostly looks like a usb style 
> null modem cable. No idea where to get this hardware though.

D'uh - it reads any usb 2 to usb 2 data link cable can be used for this
purpose. Such cables are available for ~ 10$

Also: This is at least supported by the ICH4 and newer Intel EHCI
controllers. I wonder whether AMD or others support it as well?


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