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WR port of node remains down after power cycle of node AND WR switch #51
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The suspicion: The link detection works independently who has booted first. If so, we should've seen this issue also in the lab or testing facility. This effect hasn't been seen so far in the lab, and the GTX of the Arria II platform hasn't change since years... I would check the reset circuit of the GTX in the SCU, a lot of things have been changed around... |
Same problem occurs if the optical fibre is disconnected or reconnected between switch and node Note:
(both using gateware from same nightly build) |
solved for Arria 5 a fix for Arria would require a major effort |
update (January 2021): in rare cases this is also observed with fallout gateware |
See #309 |
There seems to be an annoying bug that seems to occur when a node (SCU) and WRS are switched-on simultaneously after a power cut.
The symptoms are the following
Suspicion: The FPGA of the node is much faster with "booting" compared to the WRS. It somehow misses to detect "link up" after WRS starts and remains trapped in "link down" state.
This issue is causing real annoyance in cases were major parts of the facility need to be recovered after a major power-cut.
Maybe this is linked to another issue:
#50
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