From mboxrd@z Thu Jan 1 00:00:00 1970 To: Keith Outwater Cc: linuxppc-embedded@lists.linuxppc.org Subject: Re: Recommendations for LXT971A PHY MII interrupt connection From: Wolfgang Denk Mime-version: 1.0 Content-type: text/plain; charset=ISO-8859-1 In-reply-to: Your message of "Fri, 21 Dec 2001 08:45:00 PST." Date: Wed, 26 Dec 2001 20:43:56 +0100 Message-Id: <20011226194401.C86BA10E25@denx.denx.de> Sender: owner-linuxppc-embedded@lists.linuxppc.org List-Id: Hi Keith, in message you wrote: > > Does anyone have specific recommendations as to the best way to connect an > Ethernet PHY's MII > management I/F interrupt to the processor? I'm using an Intel LXT971A PHY. Ummm... what are your options? All designs look pretty similar to me, the main difference being the interrupt pin they chose for the PHY interrupt, if any. > For example, are the general purpose external interrupts on IRQ[0:6] or the > CPM interrupts on port C preferred? Softwarewise, it's easier to use one of the IRQ pins. > Is there a specific pin or interrupt that is preferred? No. > PS: (this is a bit off topic linux-wise, but related: Wolfgang, what's the > preferred method as far a ppcboot is concerned?) Being lazy, the preferred (by me) method is not to use a PHY interrupt at all :-) You need the PHY interrupt only in cases when you need to get informed about link status changes. Few applications really need this type of information (although it's "interesting", especially during board bring-up). Hope this helps, Wolfgang Denk -- Software Engineering: Embedded and Realtime Systems, Embedded Linux Phone: (+49)-8142-4596-87 Fax: (+49)-8142-4596-88 Email: wd@denx.de Bradley's Bromide: If computers get too powerful, we can organize them into a committee - that will do them in. ** Sent via the linuxppc-embedded mail list. See http://lists.linuxppc.org/