Hello list, I'm trying to get kgdb setup working. I have two PCs but unfortunately only one serial port in each of those. So far everything worked great, but several days ago the monitor of the second machine was taken away from my desk, and now one of the machines is headless. As I already said, I got only one serial port, and now I use it to provide a serial console. Obviously, kgdb now doesn't work.. I've read somewhere that it is practically impossible to use one serial link for both a serial console and kgdb, but I think that's wrong, because kgdb documentation ( http://kernel.org/pub/linux/kernel/people/jwessel/kdb/ch03.html#kgdboc) says: For kgdb/gdb, kgdboc is designed to work with a single serial port. It is intended to cover the circumstance where you want to use a serial console as your primary console as well as using it to perform kernel debugging. It is also possible to use kgdb on a serial port which is not designated as a system console. So that should be possible. I googled a bit and found a kdmx (kgdb demux) script, and in fact it works, but in a very limited and weird way. For one, you can't send a BRK (break) from minicom (Ctrl-A f) because it operates on the library level (read, write, select system calls) and the BRK is sent by means of ioctl(). Sending a break is essential, because that's the way to stop kernel execution and break into the debugger. Also detach gdb command freezes the whole serial communication because of the way this script is written. So, is there any reliable way to do this? Any help, hint, etc is appreciated. Thank you, --paul -- To unsubscribe from this list: send an email with "unsubscribe kernelnewbies" to ecartis@xxxxxxxxxxxx Please read the FAQ at http://kernelnewbies.org/FAQ
