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SGI Challenge S Serial Port (zs0) Driver question

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Subject: SGI Challenge S Serial Port (zs0) Driver question
From: "Robert Rusek" <>
Date: Wed, 6 Jun 2001 10:59:11 -0700
I am trying to install RedHat 5.1 Linux on my Challenge.  I finally got the kernel to boot from the prom via bootp/tftp.  The loading of the kernel stops with the following messag:
Warning: unable to open an initial console.

The HOW-TO states the following:

This problem has two possible solutions. First make sure you actually have a driver for the console of your system configured. If this is the case and the problem persists you probably got victim of a widespead bug in Linux distributions and root filesystems out there. The console of a Linux systems should be a character device of major id 5, minor 1 with permissions of 622 and owned by user and group root. If that's not the case, cd to the root of the filesystem and execute the following commands as root:
   rm -f dev/console
   mknod --mode=622 dev/console
You can also do this on a NFS root filesystem, even on the NFS server itself. However note that the major and minor ids are changed by NFS, therefore you must do this from a Linux system even if it's only a NFS client or the major / minor ID might be wrong when your Linux client boots from it.
I have followed the above instructions and still I get:
Warning: unable to open an initial console.
I would assume then that I need a special driver for for the serial port (zs0).  Just to clarify I am connecting a terminal to the serial port of the Challenge.
Any help would be greatly appreciated.
Thank you in advance,
Robert Rusek
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