[LinuxBIOS] [linux-usb-devel] [RFC][PATCH 0/2] x86_64 Early usb debug port support.

Yinghai Lu yinghai.lu at amd.com
Fri Dec 8 09:52:26 CET 2006

On 12/7/06, Greg KH <gregkh at suse.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.


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