Kontron AM5030 uEFI - Manual (Page 33)

AM5030 uEFI BIOS Chipset Setup
ID 1037-1209, Rev. 1.0 Page 27
P R E L I M I N A R Y
4.1.2 Interrupt Remapping
This function allows for reductions in interrupt virtualization overhead for assigned devices. In-
terrupt requests specify a requester ID and an interrupt ID, and remap hardware transforms
these requests to a physical interrupt using a software-programmed Interrupt Remap Table
structure in memory.
Note: This function is available only when the function Intel(R) VT-d is set to Enabled.
Default setting: Enabled
4.1.3 Coherency Support
This function is used to indicate to the hardware to either snoop or not snoop the DMA / Inter-
rupt table structures in memory (root/context/pd/pt/irt).
Note: This function is available only when the function Intel(R) VT-d is set to Enabled.
Default setting: Disabled
4.1.4 ATS Support
This function is used for keeping VT-D I/O TLB and translation cache in sync from allowed de-
vices. To facilitate scaling of address translation caches, PCI Express protocol extensions (re-
ferred to as Address Translation Services) are being standardized by the PCI Special Interest
Group (PCI-SIG). ATS consists of a set of PCI transactions that allow the optimization of VT-d
address translations These extensions enable I/O devices to request translations from the root
complex and for the root complex to return responses for each translation request.
Note: This function is available only when the function Intel(R) VT-d is set to Enabled.
Default setting: Enabled
SETTING DESCRIPTION
Disable Use this setting to disable Interrupt Remapping.
Enable Use this setting to enable Interrupt Remapping.
SETTING DESCRIPTION
Disable Use this setting to disable Coherency Support.
Enable Use this setting to enable Coherency Support.
SETTING DESCRIPTION
Disable Use this setting to disable ATS Support.
Enable Use this setting to enable ATS Support.