You haven't said how you are trying to set the baud rate.
The basic shell command to set the baud rate of the
nth serial port is
Code:
setserial /dev/ttySn baud_base 230400
You should probably try this and see if it makes any difference. If not, it could be that you also neet to set the uart. For details try:
Looking around on Google, it seems like there are several ways to get high-speed serial comms, and it largely depends on what kind of serial port hardware you are using.
http://mhonarc.axis.se/dev-etrax/msg06754.html is one example.
You might also try upgrading your kernel; newly supported hardware features are being added all the time and 2.4.18 was released in Febuary 2002 (the current "backport" version is 2.4.35, which may be your safest bet). I don't know if high-speed serial support has been added, but this may be an easier upgrade than having to apply kernel patches and so on by hand.
Hope that's of some help,
—Robert J Lee