64 Keysight M9037A PXIe Embedded Controller User Guide
Controller Maintenance BIOS Setup
PCIe Boot (Holdoff) Time
You should not need to change the PCIe Boot time. However, some PXIe
instrument modules may take longer to be ready for enumeration than the PXI
link ready requirement of 100ms. Consequently, it is possible for some controllers
(such as the Keysight M9037A Embedded Controller) to enumerate the chassis
before all of the individual modules are ready and therefore not enumerate them.
If you have a situation where Keysight Connection Expert and/or the Windows
Device Manager consistently do not find specific instrument modules when the
chassis powers up, increase the wait time (valid range is 0 to 60 seconds).
This can be configured from the Ad vanced BIOS screen > ACPI and Power
Management field > Power-up Mode.
PCIe Performance
If your application performs intensive IO over PCIe, you should Enable PCIe
Performance. This has the effect of disabling the CPU Processor Power
Mangement (PPM) features of EIST and Turbo Mode. Tests have shown that PPM
features must be disabled to support long running PCIe data transfers without
momentary interruptions.
PCIe Performance is enabled by default. It can be enabled/disabled from the
Ad vanced BIOS screen > PCIe Performance.
Both EIST and Turbo Mode can be independently enabled/disabled from the
Ad vanced BIOS screen > CPU. However, their configuration options are only
visible when PCIe Performance is set to disabled.
Above 4G Decoding
If you have connected multiple chassis to your embedded controller, then you
should enable Above 4G Decoding. When the embedded controller is enumerating
many PCIe devices, more memory mapped IO space is required for these devices.
Enabling Above 4G Decoding allows 64 bit PCIe devices to use addresses in the 64
bit address space. Failure to enable Above 4G Decoding when it is needed will
result in failure to enumerate some PCIe devices and/or chassis.
This setting only applies to 64 bit OS. Do not turn it on if you are running a 32 bit
OS. Some earlier releases of the embedded controller disk images use 32 bit
WinPE to perform recovery operations. For those releases, if you want to use the
recovery partition (selected at boot time from the boot menu), you must first
disable Above 4G Decoding.
Above 4G Decoding is disabled by default. It can be configured from the Ad vanced
BIOS screen > PCI and PCIe.
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