I know that there's a car_rate switch to change the speed of the serial port in the car, but I really need to be able to do the same thing at home. I have an older Sun machine whose serial ports don't seem to work reliably at speeds over 38400 to which I'd like to attach the empeg serially, and I can't do it right now. It works fine if I attach it to my PC, get into the shell prompt and issue ``stty ispeed 38400 ospeed 38400'' and then attach it to my Sun. Anyone know of a way I can change the on-boot AC serial port speed?

Mark, I hear the sound of someone rubbing your lamp.

Actually, I don't think so. The player seems to be resetting the port speed when it gets restarted after the shell exits. Also, the car_rate ``symbol'' is in the player binary. So unless the kernel can just ignore that (which I suppose it could, maybe), and set it to something more reasonable (for my application), it's more in the player's bailiwick.

I'll leave this hack to you.. The serial code confuses me too much, but the basic idea is to have a [hijack]serial_rate=38400 parameter in config.ini for this. Just declare a variable "hijack_serial_rate" in hijack.c for it, initialize to 0, and add an entry to hijack_option_table[].

No other changes in hijack.c

Then, look at drivers/char/serial_sa1100.c --> there is a routine called "change_speed", which is where you should add code to replace whatever rate is specified with your own "hijack_serial_rate", but only if it is non-zero.

This should work, but if not, the reason would be that we are reading config.ini just a little bit too late in the init sequence -- not sure about that yet.

Cheers

-ml

Of course, you want player to communicate with your Sun, not just shell, right? Otherwise, it would be just a matter of putting sttys in /etc/profile (and making sure you have 'Quit' menu option, of course).