Hi Ben, > [ 32.857521] iommu_dma_unmap_page+0xc4/0xe8 (P) Can you resolve this to a source location for me. i.e. gdb vmlinux l *(iommu_dma_unmap_page+0xc4) Also what IOMMU driver is this device using? It looks like it might not support a 4k IOMMU page size.