From owner-freebsd-questions  Thu Jun  1  6: 7:53 2000
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From: Mac <mac@ngo.org.uk>
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Subject: Re: Writing a value to an IO (mem mapped) port
In-Reply-To: <20000601134414.U99925@strontium.scientia.demon.co.uk> from Ben Smithurst at "Jun 1, 0 01:44:14 pm"
To: ben@scientia.demon.co.uk (Ben Smithurst)
Date: Thu, 1 Jun 2000 14:07:50 +0100 (BST)
Cc: freebsd-questions@freebsd.org
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> I think another way is to open /dev/io before doing your outb.  As long
> as you have /dev/io open (you don't need to read or write anything
> to it) your process is allowed direct IO access, AFAIK.  I think
> i386_set_ioperm is the newer method though, so hopefully someone who has
> used it can explain how it's done.

This works!

open("/dev/io",O_RDONLY)

and then you don't need the i386_set_ioperm() at all.  The outb() just
works!

Thanks.



                       Mac


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