RT Death

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2 total messages Started by K R Maxson Mon, 31 Aug 1992 23:53

#720

Author: K R Maxson
Date: Mon, 31 Aug 1992 23:53

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I have an RT running AOS 4.3.  It will not boot either off of
hard drive or the miniboot floppy.  It begins the boot process,
gets as far as loading the kernel, and then hangs.  LEDs read
94, which the manual claims means "kernel stack overflow."

Just how badly screwed am I (I mean, besides the fact that I
am trying to use an RT)?  Is there any hope?  What is going
on?  Auntie Em!  Auntie Em!

Re: RT Death

#721

Author: John F Carr
Date: Tue, 01 Sep 1992 02:26

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In article <BtvH1I.LKI@news.cso.uiuc.edu>
	maxson@cerl.uiuc.edu (K R Maxson) writes:

>I have an RT running AOS 4.3.  It will not boot either off of
>hard drive or the miniboot floppy.  It begins the boot process,
>gets as far as loading the kernel, and then hangs.  LEDs read
>94, which the manual claims means "kernel stack overflow."

"94" means "kernel stack invalid", which is slightly different.  There are
bugs in the machine check handling code, for certain types of machine check
(those which also cause a program check).  One effect of the bug is that the
kernel compares a user-mode stack pointer to the kernel stack area.  Since
the stack is out of bounds, it prints "94".  I have a modified kernel which
seems to fix this bug.  Send me email if you want the source changes.

In your case, you probably have a faulty component somewhere in the memory
system.  If you have more than one memory card, try taking one out or
reversing the order.  Does the 94 happen before or after the kernel prints
the startup message?

--
    John Carr (jfc@athena.mit.edu)

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