[widar-wg] Finished with B108-b-XX boards; test results; H/W faults found :-(

[Ken Sowinski]

On Wed, 8 Jun 2011, Brent Carlson wrote:

> 5. Board b108-b-4 seems to have a transmit connection problem with the
> CBE switch, probably due to a cabling fault, but could be anywhere
> including traces on the PCB, or the SFP module itself.  The outgoing
> packets are all addressed fine, but the CRM/mccc packet reader thing
> fails to detect them, whereas it is fine for other boards.  The "SFP1"
> LED in the GigE GUI is green, but this just means the receiver is
> getting good signal and codes from the switch.  Can someone look at the
> switch port for b108-b-4?  If it is ok, then it is a b108-b-4 PCB
> problem (because the SFP module can still put out good codes even if the
> signal into from the GigE FPGA is dead), if not it is a cabling or SFP
> module problem.

I think that this is a CRM configuration problem.  Data from this
board arrives happily at the CBE.  I learned last week that when
baseline boards are swpped the CRM must "re-probe" the configuration;
perhaps this was not done.

In addition b108-t-6 was left configured in a weird state after
these tests.  Running a script did not change the configuration.
Poking about a bit finally made the board non-responsive and the
CMIB had to be rebooted for it to work again.

Ken