linux-kernel - Re: [LinuxBIOS] [linux-usb-devel] [RFC][PATCH 0/2] x86

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Message-ID: <20061208071437.GA23173@suse.de>
Date:	Thu, 7 Dec 2006 23:14:37 -0800
From:	Greg KH <gregkh@...e.de>
To:	"Lu, Yinghai" <yinghai.lu@....com>
Cc:	ebiederm@...ssion.com, Peter Stuge <stuge-linuxbios@....org>,
	linux-usb-devel@...ts.sourceforge.net,
	Stefan Reinauer <stepan@...esystems.de>,
	linux-kernel@...r.kernel.org, linuxbios@...uxbios.org,
	Andi Kleen <ak@...e.de>, David Brownell <david-b@...bell.net>
Subject: Re: [LinuxBIOS] [linux-usb-devel] [RFC][PATCH 0/2] x86_64 Early usb debug port support.

On Thu, Dec 07, 2006 at 07:48:17PM -0800, Lu, Yinghai wrote:
> With Greg's USB Debug, host and target can talk.
> target with console=ttyUSB0,115200n8

Ugh, no, never use the usb-serial driver as a console device.

That was a bad hack done as a bet many years ago.  For many obvious
reasons it does not work well.

> host with cat /dev/ttyUSB0
> But if use minicom in host, it will not show '\r', I guess the usb debug
> cable eat return char. Greg, Can you add that back in usb_debug by
> replacing '\n' with '\r', '\n'?

The usb-serial console code should handle this, I thought we fixed it a
while ago.

But this kind of interface is not what these devices are good for.  They
are for the debug port information, not as a usb-serial console device.
Otherwise they are way too expensive of a device...

thanks,

greg k-h
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