[coreboot] USB debug cables and emulation

Ken.Fuchs at bench.com Ken.Fuchs at bench.com
Fri Jun 27 01:15:01 CEST 2008

> Joseph Smith wrote:
> >> The blog entry explicitly states that it didn't work.
> >>
> >>     
> > Than you did not read all of it. At the end"I was finally 
> > able to get
> > console output on the iMac"

Stefan Reinauer wrote:
> With the downside that you need a full blown USB stack around 
> for that.

What about something less than a full USB stack similar to Porus?


> So it starts working some time after a kernel is running. I am sure 
> that's pretty good for what it does, but it does not replace 
> the DC20, unfortunately

Of course a JTAG device might be better.  On the other hand,
a NET20DC ($83) is a real bargain compared to an American Arium
ECM-50 or for XDP JTAG, the ECM-XDP3.

http://www.coreboot.org/JTAG/BSDL_Guide probably should be updated.

The Intel and Arium links at the bottom of this page are
no longer valid.

Here's a Geode JTAG tool that may be useful to list on coreboot's



Back to USB Debug Port:

Here's an old USB Debug Port presentation that may be useful to
those new to the concept:


Is the NET20DC really the only USB Debug Device available?  I tried
searching for others, but didn't find any.


Ken Fuchs

P.S. Stefan, are you having e-mail filter problems?

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