From mboxrd@z Thu Jan 1 00:00:00 1970 To: ppc-embed Subject: Re: Ethernet on 8260 In-Reply-To: Message from Brad Bonkoski of "17 Jul 2001 12:07:19 MST." <20010718005352.VZZY3814.femail19.sdc1.sfba.home.com@cx263713-b.mesa1.az.home.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Date: Wed, 18 Jul 2001 16:26:00 +1000 Message-ID: <6825.995437560@msa.cmst.csiro.au> From: Murray Jensen Sender: owner-linuxppc-embedded@lists.linuxppc.org List-Id: On 17 Jul 2001 12:07:19 -0700, Brad Bonkoski writes: >One further question, is it possible for a detection of a loss of the >actual Ethernet cable at the kernel level? Depends on your board design - only the PHY knows this info and you communicate with the PHY via the MII. But the 8260 has no specific support for the management communication as defined by the MII spec (MDC/MDIO - very similar to an i2c interface) - you implement this using I/O port pins, twiddling bits to send clocked serial data to the PHY. The first board design dependent thing is which port pins you choose to connect to the PHY MDC/MDIO pins. The second is which interrupt input(s) (port C pins?) you connect the PHY interrupt output(s) to. There will be others - probably dependent on the PHY you choose, or even the RJ45 connector itself! e.g. on our board, there is a bi-colour LED on the RJ45 socket which we connect to our FPGA so that with the appropriate FPGA code loaded we can interpret the PHY state outputs and display the appropriate colours - rather than dedicate I/O port pins on the 8260 to this function i.e. input the PHY state, output the LED state - wastes a lot of pins. Other board designs might use I/O port pins. LEDs aren't so critical, but you get the idea. Based on previous postings, I believe Dan Malek will (eventually) be patching the FCC driver to provide interrupt driven MII/PHY support, but you will have to hack it for your PHY etc. although most PHYs are pretty similar so that all you might need to do is recognise your vendor ID number. >Are there any pointers to >docs I could read on this? Your PHY manual, your board design manual, and section 30.3 of the 8260 UM. Cheers! Murray... -- Murray Jensen, CSIRO Manufacturing Sci & Tech, Phone: +61 3 9662 7763 Locked Bag No. 9, Preston, Vic, 3072, Australia. Fax: +61 3 9662 7853 Internet: Murray.Jensen@cmst.csiro.au (old address was mjj@mlb.dmt.csiro.au) ** Sent via the linuxppc-embedded mail list. See http://lists.linuxppc.org/