Il 07/11/2013 22:51, Peter Maydell ha scritto: >> > 1. Not all architectures have the behavior: "Address space that is not >> > RAM(and friends) >> > is for sure PCI". Only x86 behaves like this (I think). > > More specifically, the x86 pc behaves like this. Other > x86 based systems could in theory behave differently > (not that we actually model any, I think).
After Marcel's patch, we have changed behavior for at least all boards that pass get_system_memory() to pci_register_bus or pci_bus_new: * mips/gt64xxx_pci.c * pci-host/bonito.c * pci-host/ppce500.c * ppc/ppc4xx_pci.c * sh4/sh_pci.c These now will not go anymore through unassigned_mem_ops, which is a behavioral change for MIPS boards (gt64xxx_pci and bonito) at least. Furthermore, the default behavior of the memory API _is_ read all-ones/ignore writes, so I'm not sure what's the benefit of adding a separate region for master abort... Paolo
