login on console=tty with serial input

Sat Mar 17 00:39:28 EST 2007

Hi Harald

Did you find a solution for your problem?

I have almost a similar problem.

On a MPC885 board I have one serial line, an Ethernet port and a QVGA display with a /dev/fb.

As GUI library, I started to evaluate Nano-X, FLTK and wxWitgets. But there is the problem that I don't have keyboard input whether form the serial line nor form a remote shell (Ethernet).

As far I understand the matter the problem is that the console that is running on the frame buffer needs as input a keyboard device and not a serial line. Unfortunately I found till now no solution to redirect the serial line to a keyboard device.

Regards
Daniel Wyss
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SECURITON AG Alarm- und Sicherheitssysteme

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________________________________

	From: linuxppc-embedded-bounces+daniel.wyss=securiton.ch at ozlabs.org [mailto:linuxppc-embedded-bounces+daniel.wyss=securiton.ch at ozlabs.org] On Behalf Of hbruegge at rockwellcollins.com
	Sent: Tuesday, March 06, 2007 11:22 AM
	To: linuxppc-embedded at ozlabs.org
	Subject: login on console=tty with serial input

	Hi everyone.

	I just wondering, if anyone outthere can help me. I am currently kind of lost.

	I have an embedded powerpc based system running with kernel 2.6.20.  The system has only two serial lines and no PS/2 or USB support. Therefore I control the system via a serial console ( passing the commandline arg: console=ttyS0,57600) and a terminal.
	A getty program is running on /dev/console, which gives me a login: prompt, so I can login via the serial line ttyS0.
	All is working pretty perfect.

	So far so good. And now here comes my problem.
	To add a better MMI in the future I want to use the graphic card as an output.

	I added a  graphic card to the system. The kernel configuration includes framebuffer support for that particular graphic card.
	After booting the kernel, I can see a /dev/fb0 device and testing with 'echo "hello" > /dev/fb0', the message "hello" is displayed on the screen.
	Also if I add the commandline arg: console=tty console=ttyS0,57600 , I get all kernel messages displayed, not only on the serial line, but also on the screen via the framebuffer.

	So basically, what I want is graphical output (dev/fb0) with serial input (/dev/ttyS0). The user sees a login prompt on the screen and can enter characters by a terminal program connected to the serial line.
	Right to that point I always used the serial console for user interaction. By adding only the commandline argument console=tty, I get a nice login prompt on the graphic screen. BUT I have no input via the serial line???

	So, how do I connect the serial line /dev/ttySx  to the standard input path of the virtual console.

	Any hint is welcomed. Any manuals to read are also welcomed.

	Thanx

	Harald Brüggemann

	--------------------------------------------------------
	Harald Brüggemann
	Rockwell Collins Deutschland GmbH
	GrenzhöferWeg 36
	D-69046 Heidelberg
	Germany

	Phone:     +49 - 6221 - 512 484
	Fax:          +49 - 6221 - 512 301

	e-mail:   hbruegge at rockwellcollins.com

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