It is recommended that you build a soft-float userspace instead.
-config IOMMU_VMERGE
- bool "Enable IOMMU virtual merging"
- depends on PPC64
- default y
- help
- Cause IO segments sent to a device for DMA to be merged virtually
- by the IOMMU when they happen to have been allocated contiguously.
- This doesn't add pressure to the IOMMU allocator. However, some
- drivers don't support getting large merged segments coming back
- from *_map_sg().
-
- Most drivers don't have this problem; it is safe to say Y here.
-
config IOMMU_HELPER
def_bool PPC64
bool
default y
+config NEED_DMA_MAP_STATE
+ def_bool (PPC64 || NOT_COHERENT_CACHE)
+
config GENERIC_ISA_DMA
bool
depends on PPC64 || POWER4 || 6xx && !CPM2