Re: [U-Boot-Users] [PATCH] Add support for Generic PHY in macb

Haavard Skinnemoen wrote:

Yes, we could do that. But it comes with its own share of problems -- some boards have a too weak pull-up (or none at all) on the MDIO line, so the probing code sometimes thinks it has found a whole bunch of PHYs...

And you have to know which PHY belongs to which MII port - for example, the IXP420 has two MII busses, but only one shared MDIO, so PHY addresses can not be autodetected - you need some kind of board-specific table/code that defines the mapping between PHY addresses and MII busses. Which is basically what we have now, in the form of CONFIG_PHY*_ADDR ;-)

cu Michael