linux-kernel - Re: [LinuxBIOS] #57: libusb host program for PLX NET20DC debug device

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Date:	Fri, 1 Dec 2006 11:19:16 -0800
From:	Greg KH <gregkh@...e.de>
To:	"Lu, Yinghai" <yinghai.lu@....com>
Cc:	Stefan Reinauer <stepan@...esystems.de>,
	Peter Stuge <stuge-linuxbios@....org>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	linuxbios@...uxbios.org, linux-kernel@...r.kernel.org
Subject: Re: [LinuxBIOS] #57: libusb host program for PLX NET20DC debug device

On Fri, Dec 01, 2006 at 10:55:48AM -0800, Lu, Yinghai wrote:
> -----Original Message-----
> From: Greg KH [mailto:gregkh@...e.de] 
> 
> >I can do that in about 15 minutes if you give me the device ids for the
> >usb debug device that you wish to have.
> 
> >Or you can also use the generic usb-serial driver today just fine with
> >no modification.  Have you had a problem with using that option?
> 
> We are talking about using USB debug device/EHCI debug port in LinuxBIOS
> in legacy free PC.
> Because one AM2+MCP55 MB doesn't have serial port.
> 
> I guess Eric is working on USB debug device/EHCI debug port for
> earlyprintk or printk.

Well, earlyprintk will not work, as you need PCI up and running.

And I have some code that barely works for this already, perhaps Eric
and I should work together on this :)

> So we need one client program on host side. So it would great if we
> could use current USB stack for 
> the clients on system even without debug port.

Yes, that will work just fine today using the usb-serial generic driver.
I'll knock up a "real" driver for the device later today and send it to
Linus, as it's trivial to do so, and will make it simpler than using the
module parameters.

thanks,

greg k-h
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