Re: [Qemu-devel] [libvirt] Configuring pflash devices for OVMF firmware

[Laszlo Ersek <lersek@redhat.com>]

On 01/28/19 15:58, Peter Maydell wrote:
> On Mon, 28 Jan 2019 at 14:56, Laszlo Ersek <lersek@redhat.com> wrote:
>> Regarding OVMF, I kept the flash driver intentionally in the dark about
>> split vs. unified pflash, so OVMF will not care, as long as the same
>> GPAs behave the same as before.
>>
>> Regarding ArmVirtQemu, I'm not so sure. It think it already depends on
>> two separate pflash chips, through the DTB that QEMU exposes. So
>> unifying the chips (albeit with multiple regions) might actually confuse
>> the firmware.
> 
> "virt" is a funny case because there is no underlying hardware
> that we're trying to match. So it is whatever we say it is
> and we've said it's two separate pflash chips. We don't need
> to change that I think. (IIRC this is derived partly from
> OVMF usecase requirements and partly from the vexpress devboards
> having 2 flash chips.)

That sounds great, but in that case, would the work be justified in
practice, to introduce single-ship-with-multiple-regions, if only x86
put it to use (for OVMF), but arm/aarch64 "virt" would have to stick
with the current layout?

Thanks
Laszlo