From owner-freebsd-hackers@FreeBSD.ORG  Thu Mar 11 15:18:28 2010
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Date: Thu, 11 Mar 2010 12:01:37 +0100
From: Gary Jennejohn <gary.jennejohn@freenet.de>
To: Cole <cole@opteqint.net>
Message-ID: <20100311120137.23ec543b@ernst.jennejohn.org>
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Cc: freebsd-hackers@freebsd.org
Subject: Re: bus_space_tag, bus_space_handle
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On Thu, 11 Mar 2010 11:04:52 +0200
Cole <cole@opteqint.net> wrote:

> Hi.
> 
> Im currently needing to write to a few registers for a PCI device. The
> driver is provided, but it does not contain support for writing
> specific registers itself. I also do not with to modify the driver.
> 
> I would like to know what the best method would be for writing to
> these registers, the best way to go about getting bus_space_tag, and
> handle for the connected pci device.
> 
> Im currently using FreeBSD 7.x.
> 

Take a look at pciconf(8).  Might help.

---
Gary Jennejohn