config SOC_INTEL_COMMON_BLOCK_VTD bool depends on PLATFORM_USES_FSP2_0 help Intel Processor common VT-d/IOMMU support config ENABLE_EARLY_DMA_PROTECTION bool "Enable early DMA protection" depends on SOC_INTEL_COMMON_BLOCK_VTD default n help Setting this makes the whole memory from 0 to TOLUM and from 4GB to TOUUD DMA protected with VT-d PMR registers. Disable this setting if your OS does not support IOMMU. The payload must be aware of the DMA protection, otherwise I/O devices might not work. If unsure, say N.