PPC4xx 2x eth phy

Some quick feedback to the list. A few weeks ago I talked about the problem=
 of the second ethernet connection not working when the first ethernet conn=
ection does not have a link.

Basically the problem is PHYs that don't generate a RX clock when no link i=
s present (i.e. ET1011. It turns out that in case of the 440Epx, there is s=
ome interdependency within the EMAC which means that when EMAC1 initialises=
, there MUST be a RX clock on EMAC0. If that is not the case, EMAC1 will NO=
T send/receive even though initialisation and auto-negotiation is successfu=
l.

There is some linux code for handling missing RX clocks, but this code does=
 not extend to the scenario where one EMAC is dependent on another EMAC's P=
HY having a receive clock.

Regards
   Jan Reyneke

HI,

We've run into a bit of an odd problem and we are not sure where to go an=

d

look for the cause.

We have some 440EPx based hardware with two GIG-Ethernet ports using RGMI=

I

and 2x ET1011C PHY's. Problem is that eth1 will only initialise correctly
(i.e. receive and transmit) if eth0 has a link. Eth0 always work OK,
regardless of eth1 status. Eth1 will work OK if eth0 has a link (i.e.
initialised) at time of setup. Once initialised, eth0 status is
irrelevant.
All this is during Linux boot process.

Any ideas?

We can access PHY registers via u-boot (mii commands). Same 1Gig link
speed
is used on both ports. Linux kernel is 2.6.19.

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