There already exists a MII<->RMII converter for ethmac that was made for the ordb2a port. I have been planning to put it into the ethmac repository, but haven't had time to do it. This sounds like a good opportunity to get this done. I'll try to commit it sometime this weekend. ethmac could need some more love in general, but that's outside of the scope for this thread
//Olof 2013/11/15 Stefan Kristiansson <stefan.kristians...@saunalahti.fi> > On Fri, Nov 15, 2013 at 12:31 AM, Andrew Back <and...@abopen.com> wrote: > >> Hi Stefan, >> >> On 22 October 2013 20:41, Stefan Kristiansson >> <stefan.kristians...@saunalahti.fi> wrote: >> > On Tue, Oct 22, 2013 at 2:55 PM, Andrew Back <and...@abopen.com> wrote: >> >> >> >> On 22 October 2013 11:53, Stefan Kristiansson >> >> <stefan.kristians...@saunalahti.fi> wrote: >> >> > >> >> > Something like this: >> >> > >> >> > >> http://www.thaieasyelec.net/index.php/Ethernet-Module/DP83848-Ethernet-Phy-Breakout-Board/p_179.html >> >> > would do it. It will still require a small bit of HDL hacking >> though, to >> >> > add >> >> > the ethernet mac core to the de0_nano SoC. >> >> > Drivers should be covered though. >> >> >> >> Would that hacking be akin to a minimal wiring exercise or a fair bit >> >> more involved? >> >> >> > >> > Basically just wiring and instantiation of the ethmac core. >> > For orpsocv3 this is perhaps not the whole truth, since there are no >> boards >> > using >> > ethmac yet, so a core description for it has to be made as well. >> > But it shouldn't be a huge task, and I'm sure you'd get well enough >> support >> > from us. >> > >> > Btw, the breakoutboard I linked to seems to be out of stock, >> > but I found a similar here: >> > http://www.wvshare.com/product/DP83848-Ethernet-Board.htm >> >> So the DP83848 PHY breakout board I ordered from Hong Kong has now >> arrived, and I was wondering where I should look to ascertain how to >> go about adding ethmac to ORPSoCv3 and to do the wiring. >> >> The board has TX0/1, RX 0/1, TX_EN, MDC, CRS, MDIO and OSCIN pins. I'm >> guessing I may need the SMII core also? >> >> > Not SMII, that's an RMII interface. I didn't realise that the board only > exposes that, not MII. That means you need a bit more work to get it > working > than just wiring it up, but not much. > You need a trivial RMII/MII converter ontop of the ethmac. > I can dig out some code for taht for you some time next week, > but it's very simple, the difference between RMII and MII is basically > doubled > data rate for the TX/RX signals (50 MHz vs 25 MHz in 100Mbit mode) and > that RXDV and CRS share the same pin. > > Stefan > > > > _______________________________________________ > Linux mailing list > Linux@lists.openrisc.net > http://lists.openrisc.net/listinfo/linux > >
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