PCI Config Space access without device

Hi,I ported Linux to my NS9750 emulator. Unfortunately the documentation doesn’t say exactly what happens when I access to the register PCI CONFIG_DATA when the device given in PCI CONFIG_ADDR does not exist. Does the access always return 0 or 0xffffffff, or does the access trigger an external abort exception like on Intel IOP ? Or does it set the Abort bit in the PCI-Status field ? (The PCI standard says it will not be set for special cycles). Jochen

Hi,With the development Board I got 0xffffffff when accessing to a nonexisting device, and a data abort when config space access is disabled in Bit 31 of CONFIG_ADDR Jochen

Yes, the access always return 0xffffffff and trigger master Abort. But we strongly suggest not to do that.