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Cumulus Networks Product Bulletin 2017-02-08: Intel Atom Boot Issue



The switch fails to power up; there is no console output.


This issue may affect the following switches on the Cumulus Networks hardware compatibility list:

  • 100G switches: Dell Z9100-ON, Edge-Core AS7712-32X, HPE Altoline 6960, Mellanox SN2100, Penguin Arctica 3200C, QCT QuantaMesh BMS T7032-IX1, Supermicro SSE-C3632S
  • 40G switches: Dell S6010-ON, Edge-Core AS6712-32X, Edge-Core AS6812-32X, HPE Altoline 6940, HPE Altoline 6941, Mellanox SN2100B, Penguin Arctica 3200XLP, QCT QuantaMesh BMS T5032-LY6-x86
  • 10G switches: Dell S4048-ON, Dell S4048T-ON, Edge-Core AS5712-54X, Edge-Core AS5812-54T, Edge-Core AS5812-54X, HPE Altoline 6920, HPE Altoline 6921, HPE Altoline 6921T, Penguin Arctica 4806XP, QCT QuantaMesh BMS T3048-LY8, QCT QuantaMesh BMS T3048-LY9, Supermicro SSE-X3648S
  • 1G switches: Dell S3048-ON, Penguin Arctica 4804iq, Supermicro SSE-G3648B

Root Cause

The CPU may fail to boot after the SoC LPC_CLKOUT0 and/or LPC_CLKOUT1 signals (low pin count bus clock outputs) stops functioning. For more information, please read AVR54 in the Intel Atom Processor C2000 Product Family Specification Update from January 2017.

If this issue occurs, there will be no messages or output on the serial console, the switch fans continue to run at full speed, and the state (on/off/color) of the LEDs will all remain the same.

Note: This article will be updated as new information arises.


In the event that the switch fails to boot under the circumstances described above, Cumulus Networks recommends that you contact:

  • The Cumulus support team to make them aware of your situation, and,
  • Your hardware supplier for the appropriate hardware warranty service.


This support portal has moved

Cumulus Networks is now part of the NVIDIA Networking Business Unit! The NVIDIA Cumulus Global Support Services (GSS) team has merged its operations with the NVIDIA Mellanox support services team.

You can access NVIDIA Cumulus support content from the Mellanox support portal.

You open and update new cases on the Mellanox support portal. Any previous cases that have been closed have been migrated to the Mellanox support portal.

Cases that are still open on the Cumulus portal will continue to be managed on the Cumulus portal. Once these cases close, they will be moved to the Mellanox support portal.

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