Dear U-Boot devs/maintainers,
We are running Xilinx MPSoC based MicroTCA mezzanine boards that,
according to the MicroTCA standard, connect to the crate's Ethernet
switch via a 1000BASE-BX interface at the backplane (the interface is
basically equivalent to a SFP module; we actually have a bring-up
adapter that uses a SFP module to replicate the Ethernet functionality
outside a MicroTCA crate).
Most of our boards use a PHY in RGMII -> 1000BASE-X mode, but on some
other boards a MPSoC MGT is wired directly to the backplane without a
PHY in between (and the GEM set to 1000BASE-X mode accordingly). Now the
Xilinx GEM driver (drivers/net/zynq_gem.c) assumes there is always a PHY
connected to the Ethernet interface, and aborts the GEM initialization
if there is no PHY found.
In a previous U-Boot version, I have patched zynq_gem.c to just ignore
absence of a PHY, but the recent version of the driver
accesses priv->phydev quite a lot - so it required a bit of effort to
port the patch. Now I'm wondering if I should clean it up and try to
upstream it. (Basically, if priv->phydev is null, don't touch it,
disable autonegotiation and use speed setting from devicetree). Would a
patch like this have any chance of getting upstreamed?
Thanks and best regards,
Patrick
—
Deutsches Elektronen-Synchrotron DESY
A Research Centre of the Helmholtz Association
Notkestraße 85, D-22607 Hamburg
E-Mail: patrick.huesm...@desy.de
Web: https://msk.desy.de/
