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Hardware Support

RamRyder currently supports multiple memory device types, including DIMM, PMem, and CXL memory devices. We also plan to support CXL pool memory and HBM in the future.

Both RamRyder and RAMOS use a software-defined memory model. To let software manage memory at the channel level, each device type needs its own hardware-specific setup so that per-channel memory devices are exposed to the software layer.

Different device classes use different mechanisms, firmware models, BIOS requirements, and host enumeration paths. As a result, the setup steps are not identical across DIMM, PMem, and CXL memory.

Setup Guides​

Use the following guides for the corresponding hardware:

  • DIMM: disable hardware interleaving, calculate per-channel physical address boundaries, reserve memory with memmap, and reconfigure the resulting namespaces as devdax devices.
  • PMem: switch PMem from the default interleaved AppDirect layout to AppDirectNotInterleaved, then create per-region devdax namespaces for software management.
  • CXL: understand how Linux exposes CXL memory in Device DAX or System RAM mode, and follow upstream tooling guidance to convert CXL devices into a DAX-usable form when needed.