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Date: Mon, 01 Dec 2008 09:38:51 +0100
From: Christoph Mallon <christoph.mallon@gmx.de>
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To: Won De Erick <won.derick@yahoo.com>
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Cc: freebsd-hackers@freebsd.org, freebsd-hardware@freebsd.org
Subject: Re: Watchdog for Boser (HS-7001)
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Won De Erick schrieb:
> Hello,
> 
> I was trying the assembly language program that is specified in the following document (p24) to set, reset the built-in watchdog timer for the Boser Box.
> 
> http://www.boser.com.tw/manual/HS-7001v1.1.pdf
> 
> I then installed nasm in FreeBSD 6.2, and added the following lines at the beginning.
> 
> section .text
>   global _start
> 
>   _start:
> 
> I did assemble, link (ld) and got no error. But when I run, I got the following error:
> 
> # ./watchdog.out
> Bus error (core dumped)

> MOV DX, 2EH
> MOV AL, 87H
> OUT DX, AL
> OUT DX, AL

Userland is not allowed to write to ports. That's the bus error you see. 
Also without a call to the exit syscall at the end, it will segfault.

Regards
	Christoph