Advanced users • Re: Pi5 using IOMMU not CMA?

Code:

                iommu2: iommu@5100 {                        /* IOMMU2 for PISP-BE, HEVC; and (unused) H264 accelerators */                        compatible = "brcm,bcm2712-iommu";                        reg = <0x10 0x5100  0x0 0x80>;                        cache = <&iommuc>;                        #iommu-cells = <0>;                 };                iommu4: iommu@5200 {                        /* IOMMU4 for HVS, MPL/TXP; and (unused) Unicam, PISP-FE, MiniBVN */                        compatible = "brcm,bcm2712-iommu";                        reg = <0x10 0x5200  0x0 0x80>;                        cache = <&iommuc>;                        #iommu-cells = <0>;                         #interconnect-cells = <0>;                 };                iommu5: iommu@5280 {                        /* IOMMU5 for PCIe2 (RP1); and (unused) BSTM */                        compatible = "brcm,bcm2712-iommu";                        reg = <0x10 0x5280  0x0 0x80>;                        cache = <&iommuc>;                        #iommu-cells = <0>;                         dma-iova-offset = <0x10 0x00000000>; // HACK for RP1 masters over PCIe                };                iommuc: iommuc@5b00 {                        compatible = "brcm,bcm2712-iommuc";                        reg = <0x10 0x5b00  0x0 0x80>;                };