Force GFP_DMA32 allocation for Rockchip IOMMU v2 page tables to fix NPU operation on systems with >4GB RAM. Without this patch, IOMMU allocates page tables above 4GB which the NPU cannot access, causing DMA mapping failures. Tested on ODROID-M1 with 8GB RAM, kernel 6.18.9-current-rockchip64. |
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