Release Notes

1.   Features and Fixes

The following is a summary of the key software features of the tagged N1SDP-2020.07.27 release.

  • Stability improvement over the GEN4 x16 link on CCIX slot. Verified with Mellanox Card (MCX516A-CDAT).
  • Switched to user space dhcp client from the kernel space dhcp client for the initial ubuntu boot.
  • Updated MCC firmware (mbb_v107) – This prompt for the recommended PMIC firmware.
  • Added new PMIC firmware (300k_8c2) – This supports for boards manufactured post Nov 2019.
  • Added latest PCC firmware (pcc_v050) – This allows to update of older boards.

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.
  • Update/Change board firmware only if MCC FW ask to do so, see here for more information https://community.arm.com/developer/tools-software/oss-platforms/w/docs/604/notice-potential-damage-to-n1sdp-boards-if-using-latest-firmware-release
  • 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

Limited PCIe testing done on: - Mellanox ConnectX-5 - Xilinx U280 CCIX card

4.   Known Issues or limitations

  • If either of the two boards needs to boot-up in a single chip mode with a C2C setup, then the other board should be powered off.
  • To boot a standard distribution on N1SDP platform the kernel must be patched with the PCIe quirks. See the article PCIE
  • PCIe root port is limited to GEN3 speed due to the on-board PCIe switch supporting maximum GEN3 speed.
  • GEN4 x16 link in CCIX slot has not been performance tested.
  • CCIX usecases (Accelerator/Multichip) is limited to GEN3 speed.
  • Page Request Interface (PRI) feature is not available in both SMMUs interfaced with PCIe & CCIX root ports.
  • Currently only Micron 8GB single Rank DIMM (part number: MTA9ASF1G72PZ-2G6D1) and 16GB dual Rank DIMMs (part number:MTA18ASF2G72PDZ-2G6E1) are supported.
  • Multichip usecase does not enable peripheral access in the slave chip.
  • Stability issues have been observed on long stress tests of the system.
  • On-board HDMI connection is not supported for graphics output. PCIe graphics card can be used for graphics support.

5.   Disclaimer

  • Limited Testing for now due to current global scenario, to be revisited once we get back on site.

6.   Support

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

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