Chapter 4: AMI BIOS
4-13
SCU Conguration
When this submenu is selected, the AMI BIOS automatically detects the presence
of the SAS SCU Devices and displays the following items:
Disable Storage Controller Unit (SCU) Devices
Set this item to Enabled to activate the chipset's SCU devices. The op-
tions are Enabled and Disabled.
OnChip SCU Option PROM
Set this item to Enabled to activate the onboard SAS option ROM. The
options are Enabled and Disabled.
PCIe/PCI/PnP Conguration
This feature allows the user to set the PCI/PnP congurations for the following items:
PCI ROM Priority
In case of multiple Option ROMs (Legacy and EFI-compatible), this feature speci-
es what ROM to launch. The options are Legacy ROM and EFI Compatible ROM.
PCI Latency Timer
This feature sets the latency Timer of each PCI device installed on a PCI bus. Se-
lect 64 to set the PCI latency to 64 PCI clock cycles. The options are 32 PCI Bus
Clocks, 64 PCI Bus Clocks, 96 PCI Bus Clocks, 128 PCI Bus Clocks, 160 PCI
Bus Clocks, 192 PCI Bus Clocks, 224 PCI Bus Clocks and 248 PCI Bus Clocks.
Above 4G Decoding
Set this item to Enabled to activate 64-bit capable devices to be decoded above
the 4G address space. This works only if the system supports 64-bit PCI decoding.
The options are Enabled and Disabled.
PERR# Generation
Set this item to Enabled to allow PCI devices to generate PERR# error codes. The
options are Enabled and Disabled.
SERR# Generation
Set this item to Enabled to allow PCI devices to generate SERR# error codes. The
options are Enabled and Disabled.
Maximum Payload
This feature selects the setting for the PCIE maximum payload size. The options
are Auto, 128 Bytes, and 256 Bytes.
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