From: jmk@plan9.bell-labs.com
To: 9fans@cse.psu.edu
Subject: Re: [9fans] etherigbe.c
Date: Thu, 7 Apr 2005 23:12:54 -0400 [thread overview]
Message-ID: <b4cb2c06bdb87227e03465fe7b0450d4@plan9.bell-labs.com> (raw)
In-Reply-To: <830a180baf50d33ac3bf21dc23e6e710@coraid.com>
On Thu Apr 7 21:02:04 EDT 2005, brantley@coraid.com wrote:
> ...
> One question I have, though, is why do I want to touch the phy anyway?
> Does anyone have a firm reason, other than the general `that's the way
> we've always done it.'
> ...
we haven't always done it. in fact, we resisted for a very long time.
the usual reason is that you don't know the state of either the mac or
phy when you boot, so you reset both. sometimes the phy configures
automatically, sometimes not. there are vendor specified registers in
the phy which may need setting. there are bugs in the mac or phy which may
need to be worked around. the phy and mac may be tightly coupled so
the mac doesn't need any tweaking depending on what the phy does, or
they may be more loosely coupled and changes in the phy configuratiuon
(speed, duplex, pause) may require changes in the mac.
prev parent reply other threads:[~2005-04-08 3:12 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-04-08 0:58 Brantley Coile
2005-04-08 2:13 ` [9fans] plan9.log arisawa
2005-04-08 3:12 ` jmk [this message]
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