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Date: Mon, 1 Dec 2008 13:19:12 +0100
From: Gary Jennejohn <gary.jennejohn@freenet.de>
To: Christoph Mallon <christoph.mallon@gmx.de>
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Cc: freebsd-hackers@freebsd.org, freebsd-hardware@freebsd.org,
	Won De Erick <won.derick@yahoo.com>
Subject: Re: Watchdog for Boser (HS-7001)
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On Mon, 01 Dec 2008 09:38:51 +0100
Christoph Mallon <christoph.mallon@gmx.de> wrote:

> 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.
> 

See io(4), i386_get_ioperm(2), i386_set_ioperm(2), mem(4).

---
Gary Jennejohn