Han,
Are you referring to a UCS fabric Interconnect - 6100? As far as the port errors, what exactly are you seeing?
If this is a 6100, not sure why you'd be booting it with an N5K image. These are built for FI images only, even though they run NXOS underneath.
If you want to troubleshoot, I'd suggest loading one of the recent 6100 images and running NXOS commands from the switch context (connect nxos).
Regards,
Robert