On 13/02/2018 23:05, dann frazier wrote:
> +config INDIRECT_PIO
> + bool "Access I/O in non-MMIO mode"
> + depends on ARM64
> + help
> + On some platforms where no separate I/O space exists, there are I/O
> + hosts which can not be accessed in MMIO mode. Using the logical PIO
> + mechanism, the host-local I/O resource can be mapped into system
> + logic PIO space shared with MMIO hosts, such as PCI/PCIE, then the
> + system can access the I/O devices with the mapped logic PIO through
> + I/O accessors.
> + This way has a relatively little I/O performance cost. Please make
grammar nit - s/a relatively/relatively/
> + sure your devices really need this configure item enabled.