[gentoo-user] Serial port console debugging

[Mark Knecht]

Hi all,
   Is there a HOWTO on serial port console debugging for Gentoo?

   I'm seeing a crash on a new kernel at boot time and the kernel
developers have asked me to set up a null modem environment, which
I've done. I'm now trying to test it. However their very simple first
test command:

lightning ~ # echo x > /dev/ttyS0
lightning ~ #

does not appear to produce any text on the second machine.

   I know nothing about setting up serial ports under Linux and am
looking for some instructions. Here's the environment:

Machine 1 - lightning - 1 serial port - this is the machine that
crashes at boot with a certain option

Machine 2 - gigastudio - 2 serial ports - this machine is running minicom

   What's a really simple process for checking out whether this is set
up correctly?

1) I don't know that the null modem cable is good. I just bought it.

2) I don't know how to see if the serial ports are receiving any valid
data, status signals, or anything else to show they are working.

3) I don't know if minicom would display incoming characters by default.

   I do think that I have serial support built into both kernels, but
I'm not sure where to look to see status of serial ports.

   Thanks in advance for your ideas.

Cheers,
Mark

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