[En-Nut-Discussion] Problem with ETH PHY Lan8742

Uwe Bonnes bon at elektron.ikp.physik.tu-darmstadt.de
Wed Aug 31 11:38:14 CEST 2016


while the Phy Lan8742A on the STM32 Discovery Boards works, on my
NUCLEO-F746ZG restarting often does not work and on NUCLEO-F767ZI boards
even starting only works on rare occasions.

One problem I see is the content of the BMCR register after startup. Bits
13/12/8 should be set by the strap option, but often vary. The bits should
be captured with reset deasserted, and a quick view with the scope does not
show an obvious problem with the reset waveform. Has anybody seen problems
with captured strap values on PHYS?

Any other ideas how to debug?

Uwe Bonnes                bon at elektron.ikp.physik.tu-darmstadt.de

Institut fuer Kernphysik  Schlossgartenstrasse 9  64289 Darmstadt
--------- Tel. 06151 1623569 ------- Fax. 06151 1623305 ---------

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