AMCC 440EP phy detection

Grant Likely grant.likely at
Thu Apr 9 03:00:30 EST 2009

On Wed, Apr 8, 2009 at 9:01 AM, Stefan Roese <sr at> wrote:
> On Wednesday 08 April 2009, Eddie Dawydiuk wrote:
>> > I found the ibm_newemac driver(2.6.29) makes the assumption that the
>> > bootloader has already configured the tx enable pin as it is a
>> > multiplexed pin. Unfortuantley I am not using U-Boot and our minimal
>> > bootloader does not do this.  After finding tx enable was never
>> > asserting for Eth0 a quick user space program verified tx enable was
>> > configured as a GPIO pin.
>> I would like to eventually submit our changes for upstream support. Based
>> on this would you recommend ensuring tx enable is configured properly in
>> the initialization of the ibm_newemac driver or the platform
>> initialization?
> This GPIO multiplexing configuration does not belong into the ibm_newemac
> driver since it is very platform/board specific. The platform code is
> definitely a better place.

Even better is the platform specific boot code (firmware or equivalent)


Grant Likely, B.Sc., P.Eng.
Secret Lab Technologies Ltd.

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