[ipxe-devel] [ipxe/ipxe] virtio changes 5/2016 (#55)

[Michael Brown]

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?  What goes wrong if iPXE just enables both?  Does this prevent iPXE 
from using the modern interface?

Michael