Re: [edk2-devel] [Patch v2 1/1] MdeModulePkg/Core/Dxe: Set MemoryTypeInfo bin range from HOB

["Laszlo Ersek" <lersek@redhat.com>]

On 1/24/24 18:46, Kinney, Michael D wrote:
> Hi Laszlo,
> 
> Yes.  I can add more details in the commit message.
> 
> The impact is for ACPI S4.  There are many reasons why the set of
> HOBs passed into the DXE Core may change from boot to boot or that
> allocations in the early DXE init phase should change where the
> memory type information bins are allocated.
> 
> ACPI S4 does do a power cycle and it is possible to do FW updates
> or FW setup config changes between an S4 save and S4 resume operation.
> 
> It is even possible for one OS to do S4 save.  Reboot the system
> to boot a completely different OS.  Reboot again and do an S4 resume
> of the original OS.
> 
> If a platform chooses to enable this feature, the number of scenarios
> that an S4 resume can fail is reduced.

Awesome info, I couldn't have imagined. (I never use, or develop for,
ACPI S4.) Thanks!

Laszlo



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