serial communication with tcl

Hello,
I'd like to program with tcl language the serial ports of my arm
target (sam9260).
I built a rootfilesystem including the tcl package (tcl-8.4.9) with
buildroot.
On my target (kernel-2.6.23) when i tried to execute the following
commands

set serial [open /dev/ttyS0 RDWR]
fconfigure $serial -mode "115200,n,8,1"

here's the message i get:

bad option "-mode": should be one of -blocking, -buffering, -
buffersize, -encoding, -eofchar, or -
translation
while
executing
"fconfigure $serial -mode "115200,n,8,1" "

Any ideas ?
regards
.

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