Claudi Jr ha scritto:
Hi people,
I have tested uCLinux-dist-20070130 with latest patch 20070130-20080131
on MCF5282 evaluation board (using kernel 2.6.x). I've payed my
attention on network applications
and I have noticed that network sometimes gets stalled and does not
recover, even
doing ifconfig down-up. I have debugged the FEC driver and it seems
there's a lost of synchronization
between FEC and the interrupt service routine attending it when packets
are received or sent.
By using my board as a web server (using Boa), I tested the network by
massively performing wget's
from my host computer (in order to retrieve a dummy file from the web
server). The result was
that, after few minutes, network stalled. Even by leaving the network
quiet for a time, I was not able
to communicate again with the board. The problem is clearly on the FEC
driver, because I could
see that interrupts were succesfully raised when packets were received
but the function handling
the RX interrupt always detected "empty packet". There was, thus, a lost
of synchronization on reading
the RX ring buffer.
I have applied some modifications on the FEC driver (see patch below)
and now network does not stall
anymore. Actually, I have been performing wget's for 12 hours and all of
them have succeeded.
Maybe someone is having the same problem. On the other hand I would be
grateful if someone having
other Coldfire based boards different from MCF5282 (e.g MCF5329, ...)
could test the patch I
attach below. In case it succeeded, I would ask for the driver matainer
to consider applying the patch.
I really can assure that the driver coming in the latest uclinux distro
does not work in all
cases (at least on my board!).
Again, patch must be applied against drivers/net/fec.c for linux 2.6.x
in uCLinux-dist-20070130 with latest patch 20070130-20080131 already
applied.
Hi Claude,
I had similar problems on a MCF5282, which seems being solved with
modifications to cache setting code, I'd like to try your patch as soon
as I have some spare time (I hope this week).
Feel free to contact me privately to discuss your patch and other things
I've done to work this board properly.
Cordiali Saluti / Kindest Regards / mit freundlichen Grüssen
--
Marco Cavallini | KOAN sas | Bergamo - Italia
embedded and real-time software engineering
Phone:+39-035-255.235 - Fax:+39-178-22.39.748
http://www.KoanSoftware.com
Meet us @ Embedded World 2008 - Nurenberg
February 26-28, 2008 Hall 11 - 224
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