Re: partial message via usb serial console

On Mon, Oct 29, 2007 at 05:21:48PM -0500, Paul B Schroeder wrote:
>
>
> Greg KH wrote:
>> On Tue, Oct 23, 2007 at 01:57:59PM -0500, Paul B Schroeder wrote:
>>> I'm trying to get console messages from both a typical serial port and 
>>> via a USB serial device using the io_ti driver.  You can see my kernel 
>>> command line in the messages below.  Using kernel version 2.6.19-1.2895 
>>> which is basically a Fedora Core 6 kernel with my kernel config.  
>>> Compiled in:
>>> #
>>> # USB Serial Converter support
>>> #
>>> CONFIG_USB_SERIAL=y
>>> CONFIG_USB_SERIAL_CONSOLE=y
>>> CONFIG_USB_SERIAL_EDGEPORT_TI=y
>>>
>>>
>>> Something strange is happening on the USB serial console.  It starts 
>>> getting messages, stops, and then starts picking them up again towards 
>>> the end.  You can see where it gets cut off while printing the line 
>>> "Enabling fast FPU save and restore... done."
>> Yeah, usb-serial as a boot console is a joke (code was written on a
>> dare), and due to buffer sizes, and the lateness of the USB code getting
>> initialized, doesn't really work very well.  There's really nothing you
>> can do about it, but it seems to work for some people, and they like it,
>> so we aren't going to remove it :)
> Ah..  Okay..
>
>>> Oh, and ttyUSB0 doesn't end up functioning as a console whatsoever once 
>>> init starts up..
>> That should work properly, do you have your inittab set up correct for
>> that?  That is required.
> The only inittab entry that I've added is to run agetty to use it as a 
> login console..  That works fine..  i.e. I added:
> a0:2345:once:/sbin/agetty /dev/ttyS1 -t 60 115200
>
> I'm not getting output from the initscripts though..  Is there something 
> else I need to add to my inittab??  I wasn't aware of anything else I 
> needed to add..

Take a look at Documentation/serial-console.txt  You need to modify
inittab to spawn on ttyUSB0 not ttyS1, as that's not where the
usb-serial console is at :)

thanks,

greg k-h

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