A couple of weeks ago I asked for help getting a 7i92 Ethernet card to
communicate; that turned out to be a silly grounding mistake, lots of
noise on the power lines, now fixed and the software reliably loads.
However....
-- At startup, I see expected activity on the Ethernet connection (green
light flashing maybe 10 times per second), and I/O changes (monitoring
GPIO pins) are reported as expected.
-- After a random length of time, from a few seconds to several minutes,
the activity light stops working and no communication between the
computer and the card seemingly occurs. LCNC does not report any errors.
-- Power cycling the Mesa card does not restore communication.
-- Closing and restarting LCNC usually resets communications, although I
have observed situations where a Linux reboot was needed.
-- This behavior is consistent on 2 computers, both running 2.9 versions
of LCNC.
-- After the system stops communicating, messages are posted in the
dmesg log:
lloyd@lcncdev:~$ sudo dmesg
[ 165.330117] tg3 0000:02:00.0 enp2s0: Link is down
[ 166.967524] tg3 0000:02:00.0 enp2s0: Link is up at 100 Mbps, full duplex
[ 166.967530] tg3 0000:02:00.0 enp2s0: Flow control is on for TX and on
for RX
-- Two pins exported by hostmot2 exhibit very different values before
and after the comm breakdown:
before:
..7i92.0.read.time: low 20Ks
..7i92.0.write.time: low 700Ks
after:
...read.time: low 100s
...write.time: low 300s
Any hints on how to untangle this knot would be greatly appreciated.
thanks
-ldw
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