[edk2-devel] [PATCH] q35: lpc: allow to lock down 128K RAM at default SMBASE address

Igor Mammedov <imammedo@...>

On Wed, 11 Sep 2019 19:30:46 +0200
"Laszlo Ersek" <lersek@...> wrote:

On 09/10/19 17:58, Igor Mammedov wrote:
On Mon, 9 Sep 2019 21:15:44 +0200
Laszlo Ersek <lersek@...> wrote:

It looks like fwcfg smi feature negotiation isn't reusable in this case.
I'd prefer not to add another device just for another SMI feature
I thought it could be a register on the new CPU hotplug controller that
we're going to need anyway (if I understand correctly, at least).
If we don't have to 'park' hotplugged CPUs, then I don't see a need for
an extra controller.


How about stealing reserved register from pci-host similar to your
extended TSEG commit (2f295167 q35/mch: implement extended TSEG sizes)?
(Looking into spec can (ab)use 0x58 or 0x59 register)
Yes, that should work.

In fact, I had considered 0x58 / 0x59 when looking for unused registers
for extended TSEG configuration:


So I'm OK with this, thank you.
Thanks for the tip!
... patches with a stolen register are on the way to mail-list.