> This should fix it: ... > +#include <linux/dma-noncoherent.h> Not quite. Still have an issue with __phys_to_pfn(paddr) Trying ti #include <asm-generic/memory_model.h> gave we a raft of redefined macros. So I just added #define __phys_to_pfn(paddr) PHYS_PFN(paddr) to arch/ia64/mm/init.c That made the build work. But boot spontaneously resets after: mptsas: ioc1: attaching ssp device: fw_channel 0, fw_id 6, phy 6, sas_addr 0x5000c5000ecada69 scsi 5:0:0:0: Direct-Access SEAGATE ST9146802SS 0003 PQ: 0 ANSI: 5 EFI Variables Facility v0.08 2004-May-17 sd 5:0:0:0: [sdb] 286749488 512-byte logical blocks: (147 GB/137 GiB) sd 5:0:0:0: [sdb] Write Protect is off sd 5:0:0:0: [sdb] Write cache: enabled, read cache: enabled, supports DPO and FUA sdb: sdb1 sdb2 sd 5:0:0:0: [sdb] Attached SCSI disk But that might not be your fault. My ancient system is getting flaky. A v4.19 build that has booted before is also resetting :-( -Tony