To answer your questions:
Q1. And Q3: It is correct, the drivers have only be designed to work with Inphi CS4227, however the Intel documentation, specially on the Product Design Guide contains the following note:
“Customers can choose to design in other 3rd party PHYs. When choosing to use a 3rd PHY not supported by Intel then the customer assumes full responsibility for the driver (development and validation), any special tuning that may be required, and all compliance testing. The customer is responsible for any additional work that may be required”
For Q2: The integrated LAN controller in BDW-DE SoC, is also a x552, so that the MAC device within this SoC is x55X type.
Hope this information clarifies your question.
Thanks for your reply.
Based on the information stated on page 121 of the Broadwell-DE SoC-Based Grangeville Platform Design-In Presentation for IOTG Customers document # 544143, the CS4227 is the only PHY supported by cited processor for SFP+.
Due to this fact, the CS4223 should be test and validate on your own.
In case that the cited document is inaccessible to you because it is classified as Intel confidential, which requires a CDNA between your company and Intel as well as a Privileged Resource & Design Center (RDC) account. It can be requested by filling out the form stated at the following website:
We hope that this information may help you.