sdcc with ds400 and serial ports

Hi,

i am trying to use the serial port #4 in a C program. In <tinibios.h> i 
found the Serial1* functions. Are these functions for the serial port 
#4, or - as the name states - for the external port #1?

Anyway, if i compile my program with

sdcc
   -c -mds400 --model-flat24 --stack-10bit --no-xinit-opt
   -I include
   serial.c

and link it with

sdcc
   -mds400 --model-flat24 --stack-10bit -Wl-r --xram-loc 0x10000
   --code-loc 0x400000
   serial.rel  startup400.rel
   -l rominit.lib -L lib

i get the linker errors

?ASlink-Warning-Undefined Global '_Serial1PutChar' referenced by module 
'serial'
?ASlink-Warning-Undefined Global '_Serial1Flush' referenced by module 
'serial'

Are Serial1* functions only supported on ds390? How can i use Serial4 on 
my ds400? I am using sdcc 2.4.0 (Feb 23 2004) (MINGW32).


Thank you,
Arne Gellhaus

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