Re: [LinuxBIOS] USB Debug Port hardware?

[Gregg C Levine]

Hello!
Two things. One is this, wasn't our friend Bari going to be working on
something of a sort? And the other is one of, which class object does this
fall into?

On the USB portion of a current kernel I would see the usual things, then
Serial adapters and even mass storage ones, and then parallel adapters, and
finally USB Gadget ones, they would even include the odd ones that used a
USB cable such as what's packaged with some cameras to talk to the host. But
I've also seen it used with some PDA devices.

It's essentially called USB based networking.

Oh and what specific motherboards support this function.
> -----Original Message-----
> From: [e-mail]

[mailto:[e-mail]] On
> Behalf Of Peter Stuge
> Sent: Saturday, October 13, 2007 11:24 AM
> To: [e-mail]
> Subject: Re: [LinuxBIOS] USB Debug Port hardware?
>
> On Sat, Oct 13, 2007 at 04:39:19PM +0200, Uwe Hermann wrote:
> > just curious -- where do we get hardware to use with the USB Debug
> > Port debugging functionality in LinuxBIOS? Can you buy something in
> > stores?
>
> Get the NET20DC from e.g. semiconductorstore.com.
> I paid USD 80+VAT+shipping.
> > Is this specialized,
>
> Yes.
> > high-price hardware?
>
> Not that bad.
> > Can you build your own?
>
> In theory, but it's too much work IMO. It must support high speed USB
> signalling and all the standalone chips that do are fine-pitch SMD
> which brings it's own set of issues with PCB manufacturing and
> supporting passive components even if one is comfortable soldering
> the .2mm wide pins by hand.
> > Are there any HOWTOs?
>
> The USB debug class device specification contains all you need to
> know about how the device functions. Note that the class spec
> describes a device with USB on both ends. That's not strictly
> neccessary as long as the host end of the device can keep up with the
> bandwidth - important because the debug port has reduced error
> recovery IIRC.
>
> //Peter