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From: Laurent Pinchart <laurent.pinchart@tbox.biz>
To: linuxppc-embedded@ozlabs.org
Subject: Re: SCC1 as serial console
Date: Mon, 22 May 2006 16:12:53 +0200
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Hi Ladislav,

> can anybody help me to setup the SCC1 port as serial console on MPC860 with
> kernel 2.6.15.4? I would like to use it as system console during the
> booting proccess. I can not get any output on serial console during booting
> proccess, I use uboot.

Does SCC1 work correctly in U-Boot ? If not, you should fix that first. I'll 
assume it does.

There are many issues which could lead to a silent serial console. The serial 
port could be misconfigured, or the kernel could crash for another reason 
before the serial port is initialized.

Have you been able to get a serial console on another serial port (SMC) ? Are 
the clock frequencies computed by U-Boot and passed to the Linux kernel 
correct ?

Do you have a hardware debugger (BDI2000) that you can connect to the 
processor to see if Linux crashes before initializing the serial port ? If 
not, you will probably have to take a try at led-debugging (make some leds 
blink at various point in the Linux kernel to try to find out what happens), 
but that's really no fun.

Laurent Pinchart