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*To:* support () mellanox com, networking-support () nvidia com

*From:* Taylor Christian Newsome

*Date:* August 20, 2025

*Dear Mellanox/NVIDIA Networking Support Team,*

I am writing to formally submit the critical firmware parameters for
Mellanox PCI Express Host Channel Adapter (HCA) cards, as detailed in the
official documentation available here:
https://content.mellanox.com/firmware/critical_params.txt.

This document specifies essential configuration parameters that ensure
optimal performance, power efficiency, and regulatory compliance for the
following card families:

   -

   *Lion Cub / Lion Mini (P/N: MHEA28..., MHGA28...)*
   -

   *Tiger / Cheetah (P/N: MHES14..., MHES18..., MHGS18...)*

Key details include SerDes static and dynamic settings, which are critical
for maintaining hardware integrity and consistent operation. Alteration of
these parameters could impact card performance and reliability.

*Example Parameters for Lion Cub / Lion Mini Family:*

   -

   *SerDes Static Settings:*
   -

      port1_sd0_OBPreAmp = 0xf
      -

      port1_sd1_OBPreAmp = 0xf
      -

      port1_sd2_OBPreAmp = 0xf
      -

      port1_sd3_OBPreAmp = 0xf
      -

      port2_sd0_OBPreAmp = 0xf
      -

      port2_sd1_OBPreAmp = 0xf
      -

      port2_sd2_OBPreAmp = 0xf
      -

      port2_sd3_OBPreAmp = 0xf
      -

   *SerDes Dynamic Settings:*
   -

      auto_ddr_tx_options = 1
      -

      auto_ddr_rx_options = 1
      -

      auto_ddr_option_0.tx_preamp = 0xf
      -

      auto_ddr_option_1.tx_preamp = 0xf
      -

      ... (full details in the linked document)

The Tiger / Cheetah family parameters follow a similar structure and should
be preserved to maintain optimal operation.

I recommend reviewing these parameters and ensuring they are maintained as
specified. Please let me know if any further information or clarification
is required.

Thank you for your attention to this matter.

*Sincerely,*
Taylor Christian Newsome

Attachment: mellanox_critical_params.txt
Description:

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