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

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Date:	Fri, 8 Dec 2006 00:52:26 -0800
From:	"Yinghai Lu" <yinghai.lu@....com>
To:	"Greg KH" <gregkh@...e.de>
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 12/7/06, Greg KH <gregkh@...e.de> wrote:
> 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.
understood, I found with usb_serial convertor could lose some chatacter.
but the usb-debug cable seem it keep all character.
>
> > 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.
Is it in the git tree?
>
> 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...
the problem is some "modern" PC will left out serial port. then the cable
could get cheap.

YH
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