IIO Configuration Menu

►IIO Configuration

PCIe Completion Timeout

Use this feature to set the PCIe completion timeout. The options are 50us to 50ms, 50us to 100us, 1ms to 10ms, 16ms to 55ms, 65ms to 210ms, 260ms to 900ms, 1s to 3.5s, and Disabled.

PCIe ASPM Support (Global)

Use this feature to disable the Active State Power Management (ASPM) support for all PCIe root ports. The options are Disabled and Auto.

PRM Feature Control

Use this feature to enable the Platform Runtime Mechanism (PRM). The PRM is a mechanism to reduce the System Management Mode (SMM) usages and to provide an alternate means to invoke native code through the Advanced Configuration and Power Interface (ACPI) context of runtime events. The options are Disabled and Enabled.

Equalization Bypass To Highest Rate

Set this feature to Enabled to reduce the link training time for PCIe 5.0 device by skipping equalization of intermediate data rates. The options are Disabled and Enabled.

NVMe Mode Switch

When this feature is set to Auto, VMD support will be automatically enabled when a VROC key is detected by the BIOS. The options are Manual, VMD, and Auto. This feature is available for configuration when the system supports a VROC key.

PCIe PLL SSC

Select Enabled for PCIe Spread Spectrum Clocking (SSC) support, which allows the BIOS to monitor and attempt to reduce the level of electromagnetic interference caused by the components whenever needed. The options are Disabled and Enabled. The available options are CPU-dependent.

Snoop Response Hold Off for PCIe Stack

Use this feature to set the IIO snoop response hold-off value to improve throughput and reduce latency. The default setting is 9. The valid range is 0 to F. Set this feature to 0 to disable the hold-off time.

CXL Security Level

By defining security protocols, CXL standards provide protection against the data security threats. Use this feature to set the CXL security level for data transiting the CXL link. The options are Fully Trusted, Partially Trusted, Untrusted, and Auto.

  • Fully Trusted: This option allows the CXL device to access CXL.$ for both host-attached and device-attached memory ranges in the write-back (WB) address space.

  • Partially Trusted: This option allows the CXL device to access CXL.$ for device-attached memory ranges only.

  • Untrusted: If this option is selected, the host (your system) will abort all requests on CXL.$.

  • Auto: This option is based on Si Compatibility.

CXL Header Bypass

Use this feature to enable the CXL header bypass. The options are Disabled and Enabled.