Use setserial, with the spd_hi flag to configure your serial
port to use 57600 bps. Use spd_vhi to use 115200 bps.
Then, set your speed to 38400 bps. This is now the
new speed you have set. There is no speed named 57600 or 115200.
Make sure you have 16550A UARTs :-).
In my /etc/rc.local I set ttyS3 to 115200 bps by doing:
/bin/setserial /dev/cua3 irq 9 spd_vhi
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