[coreboot] USB debug cables and emulation

Stefan Reinauer stepan at coresystems.de
Thu Jun 26 16:44:48 CEST 2008

Joseph Smith wrote:
> Yeh I think the NET20DC is way to expensive anyways, unless your in a mass
> production environment.
It's 83$ at semiconductorstore. That's actually not bad for such special 

> I read somewhere you could make one, but I don't know how difficult that
> would be. I was always wondering if you could just use two USB -> Serial
> adapters with a null modem cable in the middle??
Nope, won't work. You need a USB device that explicitly understands USB 
debug mode. In this mode you don't have to set up the BARs (ie no memory 
required) to talk USB.


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