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Date:      Tue, 30 Nov 1999 00:03:46 -0600
From:      Dan Nelson <dnelson@emsphone.com>
To:        Cliff Addy <fbsdlist@federation.addy.com>
Cc:        freebsd-questions@FreeBSD.ORG
Subject:   Re: Reading an IO address
Message-ID:  <19991130000346.A47191@dan.emsphone.com>
In-Reply-To: <Pine.BSF.3.95q.991129210443.5736A-100000@federation.addy.com>; from "Cliff Addy" on Mon Nov 29 21:09:41 GMT 1999
References:  <Pine.BSF.3.95q.991129210443.5736A-100000@federation.addy.com>

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In the last episode (Nov 29), Cliff Addy said:
> I have a device which I need to use by reading an IO address.  However,
> when I use
> 
>   val=inb(0x180)
> 
> the program coredumps with a "Bus error" message.  Interestingly enough, I
> get the same message whether the card is in the slot or not.

I/O access is restricted to root.  In addition, you either need to open
/dev/io (to get unrestricted access to all IO ports), or call
i386_set_ioperm() with the port range you want to fiddle with.  "man io"
or "man i386_set_ioperm" for more info.

-- 
	Dan Nelson
	dnelson@emsphone.com


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