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The Linux kernel configuration item CONFIG_MTK_IOMMU_V1
:
( CONFIG_ARM ) && ( CONFIG_ARCH_MEDIATEK || CONFIG_COMPILE_TEST )
Support for the M4U on certain Mediatek SoCs. M4U generation 1 HW is Multimedia Memory Managememt Unit. This option enables remapping of DMA memory accesses for the multimedia subsystem.
if unsure, say N here.
Raw data from LKDDb:
lkddb of "" "" "mediatek,mt2701-m4u" : CONFIG_IOMMU_SUPPORT CONFIG_MTK_IOMMU_V1 : drivers/iommu/mtk_iommu_v1.c # in 4.8–4.20, 5.0
lkddb of "" "" "mediatek,mt2701-m4u" : CONFIG_MTK_IOMMU_V1 : drivers/iommu/mtk_iommu_v1.c # in 5.1–5.11, 5.11+HEAD
lkddb platform "mtk-iommu" : CONFIG_IOMMU_SUPPORT CONFIG_MTK_IOMMU_V1 : drivers/iommu/mtk_iommu_v1.c # in 4.8–4.14
lkddb platform "mtk-iommu-v1" : CONFIG_IOMMU_SUPPORT CONFIG_MTK_IOMMU_V1 : drivers/iommu/mtk_iommu_v1.c # in 4.15–4.20, 5.0
lkddb platform "mtk-iommu-v1" : CONFIG_MTK_IOMMU_V1 : drivers/iommu/mtk_iommu_v1.c # in 5.1–5.11, 5.11+HEAD
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Automatically generated (in year 2021). See also LKDDb sources on GitLab