Hi everyone, We've been experiencing issues with hanging serial ports when reprogramming our iBob's over JTAG. Our setup at the moment is a linux control computer with an 8-port serial-PCI card with two iBob's attached and four iBob's total on a JTAG chain (the first two being the serial-linked ones). Programming works just fine and from a cold start so does serial communication usually.
The problem occurs when we reprogram a board with a *different* bitstream, the serial port hangs permanently until the iBob's are power cycled and reprogrammed. Programming the same bitstream typically does not break the port. Occasionally however even the power-cycling and reprogramming does not bring back the serial ports. It does not seem to be the specific designs because they usually work after this procedure, instead it seems to be linked to the reprogramming. Has anyone seen this behavior before, or something similar to it? It appears to me that during an iBob reprogramming some pin that controls the serial port fails to go low but perhaps it's a linux multi-serial port problem? Thanks for your help! Rurik
