[U-Boot] Defer net initialization

[Wolfgang Denk]

Dear Alexander Stein,

please keep the mailing list on Cc:

In message <201006011035.38778.alexander.stein at systec-electronic.com> you wrote:
> 
> > network command is being run in U-Boot.  There have been some
> > discussions about this topic recently (see for example thread starting
> > here: http://thread.gmane.org/gmane.comp.boot-loaders.u-boot/76507).
> 
> I think this thread focus on another problem: setting the MAC address. I have 
> a MAC in the ethaddr environment variable which gets used properly.

You are wrong. The thread is exactly discussing the issue you are
suffering from. The whole discussion is basicly around the decision
which parts of the hardware (especially the Ethernet hardware) should
be initialized where and when.

> I traced the call graph a bit down. So on every startup eth_initialize is 
> called from start_armboot which then calls board_eth_init which calls 
> macb_eth_initialize (in my board source). And macb_eth_initialize takes very 
> long if no cable is plugged.

Please read the docs referred to in the thread mentioned above
(especially doc/README.drivers.eth, but there are some pretty
explanative comments in the thread, which is why I point you at it) to
understand why the implementationon your board is not in line with the
intended design.

eth_initialize should NOT wait for a link state.

> How could I avoid calling eth_initialize during startup but before using the 
> first net related command?

You ask the wrong question. Ity is perfectly OK to call
eth_initialize() which is supposed to register the available network
drivers, but this should NOT include to actually initialize the
hardware. So it's the lower layers that are wrong in your port.

Best regards,

Wolfgang Denk

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