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Date: Sun, 12 Feb 2012 10:30:50 -0800
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From: Juli Mallett <jmallett@FreeBSD.org>
To: Aleksandr Rybalko <ray@ddteam.net>
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Cc: Adrian Chadd <adrian@freebsd.org>, Stefan Bethke <stb@lassitu.de>,
	Marius Strobl <marius@alchemy.franken.de>,
	Aleksandr Rybalko <ray@freebsd.org>,
	FreeBSD-arch <freebsd-arch@freebsd.org>
Subject: Re: Extending sys/dev/mii
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> > The PHYs don't sit on arge1.  They sit on another device that the
> > driver bogusly assumes is tightly coupled to arge1, when in fact it
> > isn't.
>
> At least for AR7240/AR7242, MDIO control registers lie in the middle of
> register space used by if_arge.

That's a fine electrical and address-oriented understanding, but that
doesn't mean that a different functional conceptualization wouldn't lend
itself better to implementation. Fidelity to the memory layout is a neat
idea but not necessarily desirable or even reasonable.