message in syslog

[Javier Ortiz Guajardo]

I receive this message in syslog
Mux expansion bus failure detected for minor devices 0 to 63.
How can i found the cause of this message?

Thanks

[Steven E. Protter · Accepted solution]

Could be a bad cable.
Could be a bad bus
Could be a missing terminator.

dmesg

Post the output.

Someone will decrypt it and help you. I'll be in a meeting.

SEP

[Cheryl Griffin]

The messages indicate loss of communication to the HW. Could be simple as loss of power, or a cable, or something more serious such as a HW failure.

[Javier Ortiz Guajardo]

This is all i have in dmesg command (see atached file)

[Cheryl Griffin]

Does ioscan show anything?
# ioscan -fk

[Javier Ortiz Guajardo]

i found this line in ioscan -fk
tty 1 15/2 consp1 CLAIMED INTERFACE Built-i
n Serial Port DUART
unknown -1 15/3 UNCLAIMED UNKNOWN Built-i
n Ethernet
processor 0 17 processor CLAIMED PROCESSOR Process
or

anyway here is the ioscan file

[Massimo Bianchi]

Hi,
try running stm on the Mux, probably here is a cable problem.

Problem looks like to come and go, may be a loose connection.

HTH,
Massimo

[Bill Douglass]

The ethernet at h/w path 15/3 does not have a driver for it configured in the kernel. That results in no s/w claiming it (leaving it in a UNCLAIMED state).

It's a bit odd, but unlikely to be related to your problem. The MUX is on a different h/w path (3/2/0).

As others have stated, it is likely a cabling issue. What devices do you have connected to the mux?