serial interface of the arduino at 1Mbps?

Hello, could it be possible to run the serial interface of the arduino at 1Mbps?

technically the datasheet of the chip indicates that physically it is possible but if I try "serial.begin(1000000);" the communication doesnt take place,

where could i find the source code behind the "serial.begin(speed);"?

The maximum succesfull speed i've tried is 350000bps= 350Kbps,

thanks!

even 2Mbit/sec... :-)

http://www.arduino.cc/cgi-bin/yabb2/YaBB.pl?num=1254424833

-arne

source is HardwareSerial.cpp

Maybe try serial.begin(1000001);