On Mo, 2016-06-20 at 15:44 +0100, Michael Brown wrote: > On 20/06/16 15:37, Ladi Prosek wrote: > > Thanks - virtio devices may be configured to expose both I/O and memory > > BARs, with either type being enough to drive the device. It is basically > > a back-compat setup where older drivers can still use I/O ports and > > newer may choose to use the so called "modern" interface. > > > > We would like to avoid enabling PCI_COMMAND_IO / PCI_COMMAND_MEM if the > > driver is not going to use it. > > Why?
It is nice to have. It will make sure the driver will only use the interface it intends to use and doesn't mix IO-based legacy device access and MMIO-based modern device access by accident. > What goes wrong if iPXE just enables both? Nothing (in theory). cheers, Gerd _______________________________________________ ipxe-devel mailing list ipxe-devel@lists.ipxe.org https://lists.ipxe.org/mailman/listinfo.cgi/ipxe-devel
