From owner-freebsd-hackers@FreeBSD.ORG  Wed May 30 06:50:34 2007
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From: Hans Petter Selasky <hselasky@c2i.net>
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Date: Wed, 30 May 2007 08:50:23 +0200
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Cc: rmgls@wanadoo.fr
Subject: Re: direct I/O access
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On Tuesday 29 May 2007 20:10, rmgls@wanadoo.fr wrote:
> hi all,
>
> Sorry for cross posting, but perhaps hackers is a better list than
> multimedia for this topic.
>
> i am trying to port my old assembler soft for Dos to FreeBSD.
> i need to write and read directly to the midi and scsi device.
> when i try something like this i receive a sigbus error
>
> SORRY, i am NOT nor a C nor a FreeBSD expert!!!
> all i know is Assembly language!
>
> i made some search in the devel handbook and did not found the solution.
> What is wrong here?
> Can you enlight me please?

I think you need to open /dev/io before your program can execute I/O 
instructions.

--HPS