On 09/04/2015 12:43, Peter Maydell wrote: > > At this point, some memory barriers, basically. > > So what distinguishes a device that needs the memory barriers > and does its accesses via dma_* from a device that doesn't and > uses address_space_* or ld/st*_phys ? (Or for that matter a > non-device that does memory accesses...)
I don't know exactly, I didn't follow the discussion very much back then. The memory barriers were fixing PPC bugs; PCI devices definitely need them. Paolo
