[parisc-linux] Step by step .... 9000/720 and interruption (trap) 18

[Christoph Plattner <christoph.plattner@dot.at>]

Hallo PA RISC hackers !

I mentioned before, that I have problems using my Apollo 700 (9000/720)
with the Linux here. I build a new cross tool chain and a new
kernel + palo (all from 13.Jan 2001) but I always have the problem of
looping error code:

handler_interruption() pid=1 command='init'

or whatever my first process is. I have instrumented the kernel code
and added the output of the code number (a good idea to have this
fix in the kernel !) and I saw:

	code=18

So I have the code 18 (decimal). In the PA RISC 1.1 manual (your link)
I saw following description:

	18  Data memory protection trap / Unaligned data reference trap

So what does this mean here. An alignment problem ?
Why is this code not handled in the switch/case ?

I always use (I think the 32bit code). Have I set to a parisc64 ?
How can I influence this ?
Which kind of CPU is this in the 720 model ? (I know a 50MHz PA RISC ..)

I hope anybody can help here

	Christoph




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