UNIX for Dummies Questions & Answers

When I do a hard reboot, the system recognizes both the ttya and the ttyb, but when I do a hard reboot, it only doesn't recognize the ttyb. Is there a way I can fix this???

Thanks!

do you mean when you do a soft reboot it only recgonizes ttya

It only recognizes ttya when I do a soft reboot, but both with a hard reboot. Sorry about the typo.

When you hard boot a computer you are re-initializing the hardware... motherboard... i/o cards... scsi controller... that's why it's necessary at times to perform a hard boot rather than a cold boot... Cold booting a computer does not re-initialize the circuitry per-say...

Your situation could be that one of your serial i/o ports has some type of error on it.. and the only way to clear it .. is to perform a hard.. or "cold" boot of the box.

Keep in mind.. this doesn't necessarily mean that anything is wrong with your hardware....

Is there any way to figure out what exactly the problem is? Any unix commands which test the port?

Well.. you might want to troubleshoot the problem..

What function are you performing when the port locks up?


It could be application related... it could be O/S related.. and in could also be hardware related.

Try.. removing the port from the O/S and re-installing it in the kernel...

Try.. running your application on a different tty port and see if the same results occur... if they do.. then you've narrowed it down to some issue with your application.. and the hardware..

If the same error does not occur.. then you've narrow it down to indicate there could possibly be something wrong the the hardware device...