MPC8260 SCC2 UART hang

[Jeff Angielski <jeff@theptrgroup.com>]

I am having a problem with the SCC2 uart whereby the system hangs
whenever I try to use that device.  It happens using both the Denx
kernel and the kernel.org 2.4.27 kernel.

I was hoping that somebody can tell me if SCC2 works as expected on
their MPC8260 hardware so that I can reduce the scope of my debug
effort.

Here is the relevant info from the 2.4.27 kenel:

<snip>
CPM UART driver version 0.01
ttyS0 on SMC1 at 0x0000, BRG1
ttyS1 on SMC2 at 0x0040, BRG2
ttyS2 on SCC1 at 0x8000, BRG3
ttyS3 on SCC2 at 0x8100, BRG4
<snip>

Here is the simple test that causes the problem.  Once I try to access
/dev/tts/3 the system hangs.

bash-2.05b# echo "something" > /dev/tts/0
something
bash-2.05b# echo "something" > /dev/tts/1
bash-2.05b# echo "something" > /dev/tts/2
bash-2.05b# echo "something" > /dev/tts/3
[system is dead, no console, cannot ping, no nothing...]

FWIW, my hardware is the Embedded Planet EP8260 H2 1.3.

Jeff Angielski
The PTR Group