How to use s3c2410_serial1(Android)

I can not access  s3c2410_serial1(Android) on MINI2440.

on console
>echo "ok" >  s3c2410_serial1
nothing displayed on another PC connected to MINI2440 by 232c.

But on console
>echo "ok" >  s3c2410_serial0
"ok" is displayed on console.

How could I use s3c2410_serial1(Android)?
Please help me.

I can not access s3c2410_serial1(Android) by RS232C.
But 
s3c2410_serial10(console) is able to access
s3c2410_serial11 is not able to access
s3c2410_serial12 is not able to access

I want to use serial(RS232C).
Please support me.

I want to use s3c2410_serial1 by serial port of RS232C.
So I tried samples.tgz/comtest/armcomtest.

But it said that 

/ # ./armcomtest -d /dev/s3c2410_seria11
Unable to open device
strerror() is No such file or directory

Please help me.

Hi there,

I posted how to do this on the mini6410 but the same should work for the
mini2440.

http://www.friendlyarm.net/forum/topic/2487

Regards
Dave...