Hannes, I'm getting the following error in a custom configured 4.18 32-bit x86 kernel supporting PAE, with 16GiB physical memory. It loops infinitely on the error. aic7xxx 0000:00:03.0: dma_direct_map_sg: overflow 0x00000003ff800000+65536 of device mask ffffffff I have tried enabling the following to fix this in the kernel config: CONFIG_X86_PAE=y CONFIG_VMSPLIT_3G=y CONFIG_HIGHMEM=y CONFIG_HIGHMEM64G=y CONFIG_ZONE_DMA=y CONFIG_BOUNCE=y What should I look at next? - Matthew