Release Notes

1.   Features and Fixes

The following is a summary of the key software features of the N1SDP-ALPHA2-PERF-19.09 release.

  • ** This release is performance tuned stack.**
  • Supports dual rank 16GB DIMM and single rank 8GB DIMM @ 2667 MTS. Total 32GB or 16GB RAM could be accessible.
  • Core frequency bumped up to 2.6GHz
  • Workaround for Erratum 1315703 is disabled, so that the N1 CPU performance is improved in N1SDP.This may be applied for N1 software that does not require Spectre Variant 4 mitigation.
  • Thermal shutdown supported - The system is shutdown automatically when the SOC temperature rises beyond 80 degrees.
  • SLC Cache Stashing supported for increased PCIe ingress network packet performance.

Note: This release is an add-on to the N1SDP-ALPHA2-CCIX-19.07 release published before. For ALPHA2 release features, please refer to N1SDP-ALPHA2-CCIX-19.07 release notes.

2.   Precautions

  • The system thermal monitoring and control features are not yet calibrated, therefore do not operate the unit above room temperature (approximately 25°C):
  • The N1SDP is intended for use within a laboratory or engineering development environment. Do not use the N1SDP near equipment that is sensitive to electromagnetic emissions, for example, medical equipment.
  • Never subject the board to high electrostatic potentials. Observe Electrostatic Discharge (ESD) precautions when handling any board.
    • Always wear a grounding strap when handling the board.
    • Avoid touching the component pins or any other metallic elements.
  • Note: The case front panel USB 3.0 ports and & audio jacks are NOT connected/usable. They will be removed on later versions.

3.   PCIe Testing

Following are the PCIe Cards tested - PCIe and CCIX slot: - DW-PCIe-M2(Ver A) with Samsung EVO 970 Pro NVMe M.2 (GEN3 x4) - TUSB7340 DEMO EVM REV C USB hub card (GEN2 x1) - Mellanox ConnectX-5 - PEXSAT34 - Two sata controller behind switch (GEN2 X2) - Xilinx U280 CCIX card.

4.   Known Issues or limitations

  • To boot a standard distribution on N1SDP platform the kernel must be patched with the PCIe quirks. See the article PCIE
  • PCIe/CCIX Link speed supports upto GEN3. GEN4 is yet not enabled.
  • No support for PCIe SRIOV.
  • Currently supports only Micron 8GB/16GB single/dual Rank DIMM (part number: 9ASF1G72PZ-2G6D1) is supported.
  • There could be stability issues on long stress test of the system.

5.   Next Release Target

  • Full CCIX support
  • H/W accelerator and C2C use cases over CCIX.

6.   Support

For support email: support-subsystem-enterprise@arm.com

Copyright (c) 2019, Arm Limited. All rights reserved.