Thanks Scott, I do boot from U-BOOT, via Ethernet, but I'd never set the MDIO/MDC in U-BOOT. Actually, looking at the u-boot 's MPC8260ADS.h now, it is still setting the default 8272ADS boards' PC18/19 for MDC/MDIO - and my unit is using PD23/29. I guess U-BOOT is probably working (for me) since it probably defaults to the defaults of PHY and maybe not checking for PHY errors??? I guess, it is probably worthwhile having the MDIO/MDC pins also set up explicitly in mpc8272_ads_pins as opposed to relying on the boot loader. Scott Wood wrote: NM wrote: > My problem is solved now after probing the lines, MDC was not showing > any activity. > So, after explicitly setting the PD23 (MDC) to : OUTPUT/GPIO in > mpc8272_ads_pins and it worked in > > I'd previously thought about that, but I was sure that this was being > taken care of, but now that I'm thinking of it, I'm questioning my belief. > I think in the fs_enet/mii-bitbang.c: mdio_dir(..) it is supposed to > take care of this. No, the mdc pin is static; only bits which need to be changed dynamically are dealt with in mii-bitbang.c. Either the firmware or the platform code should set up static pins. > But why I had to explictly set it initially beats me. > I wonder how this works in standard distribution. It's probably set up by u-boot normally, at least if you boot from ethernet. -Scott --------------------------------- Looking for the perfect gift? Give the gift of Flickr!