My MDIO is acting strange

[Peter Pan]

linux 2.6.22 is working correctly on my board. So, I think this is due
to the difference between them.
I will check the boot time difference between 2.6.22 and my new port.
Hope that will give me a clue.

2010/4/23 Andy Fleming <afleming at gmail.com>:
> On Thu, Apr 22, 2010 at 9:36 PM, Peter Pan <pppeterpppan at gmail.com> wrote:
>> I'm porting Linux 2.6.32.6 to my MPC8247 based board. Our FCC1 and
>> FCC2 are used as 100MBps ethernet ports. MDIO is used to connect with
>> PHY chip. During boot, the of driver is checking the PHYID, it gets
>> all Fs. But after I comment the following lines:
>> //if ((phy_id & 0x1fffffff) == 0x1fffffff)
>> //    return NULL;
>> I can use my FCC ethernet normally after boot into console.
>
> This means that your PHY can work without any initialization, and
> implies the problem is with your MDIO bus.
>
>> I checked that while boot, all the read bit from MDIO pin is 1, that
>> makes no TA bit, and no PHYID.
>> I'm wondering why is that happening.
>
> Possible reasons include the board being wired incorrectly (so the PHY
> is not responding to MDIO commands), or software being configured
> incorrectly to use the wrong pins for MDIO.  That's my guess.
>
> Andy
>