On 19/01/2015 16:22, Artyom Tarasenko wrote: >>> >> >>> >> On physical machines it's EBus, which is pretty much like 8-bit ISA. >>> >> So, I think modelling it as ISA is closer to to the reality. >>> >> But out of curiosity, would it be possible to have a sysbus device >>> >> somewhere in a middle of PCI space? [...] >> > >> > Why would you want to use a SysBusDevice in the first place? > Ask Paolo. :-) For me it's only important to have a MMIO device in the > proper address range.
The reason I asked is simply because ISA devices never do MMIO (apart for the VGA window). >> > I previously discussed with Mark that it should be an EBusDevice, not an >> > ISADevice or SysBusDevice. > Interesting. I can't find this discussion in the list archive. Do you suggest > to > create EBusDevices for all ISA devices (serial, parallel, keyboard, > floppy) used in sun4u, or only for m48t59? > What would be the advantage of using EBusDevice over ISADevice? Is there a description of EBus and the sun4u memory map somewhere? Is there an "EBus bridge" PCI device similar to the PCI-to-ISA bridge? Paolo
