Re: [linux-usb-devel] partial message via usb serial console

[Greg KH <greg@xxxxxxxxx>]

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 :)

> 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.

thanks,

greg k-h

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