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 <[EMAIL PROTECTED]> 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
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