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AGAIN: Serial ports non-standard speeds

Hi all,

Maybe I did not explain very well our needs. The ETRAX 100 LX datasheet 
states that the chip has 4 asynchronous serial ports with
a) Internal Baudrate programmable from 48 Hz. to 1,5625 MHz
b) External Baudrate up to 3,125 Mhz.
c) Fixed Baudrates from 300 Hz. to 1843.5 kHz plus a non-standard baudrate 
at 6.25 MHz

Well, only the fixed baudrates seem to be available in Linux. We need to 
use 500 kHz.
What should we do in order to have an external baudrate? It seems the only 
way to obtain exactly 500 kHz.

Thanks to all.