How to debug Ethernet connectivity

[Sascha Hauer]

On Wed, Dec 11, 2013 at 10:39:17AM +0100, Atilla Filiz wrote:
> My problem is, /dev/phy0 never appears when I give the correct phy address.
> 
> Unable to find a PHY (unknown ID?)
> dhcp failed: I/O error
> dhcp: I/O error
> 
> Also, fec_probe function for fec_imx driver never gets called.

If that's the case...

> Ironically, I do not get an I/O error when I give the wrong phy
> address. Still nothing gets detected and no device node appears, but
> ethernet works(by forcing the line detect functions to return 0).

...your ethernet can't possibly work.

Sascha

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