[coreboot-gerrit] Change in coreboot[master]: soc/intel/pmc: add a note about legacy OSes/payloads to PM Timer Kconfig

[Michael Niewöhner (Code Review)]

Attention is currently required from:  Felix Singer, Lance Zhao, Nico Huber, Furquan Shaikh, Tim Wawrzynczak, Paul Menzel, Angel Pons, Subrata Banik, Michael Niewöhner, Patrick Rudolph.
Hello  Felix Singer, Lance Zhao, build bot (Jenkins), Furquan Shaikh, Tim Wawrzynczak, Tim Wawrzynczak, Paul Menzel, Angel Pons, Subrata Banik, Patrick Rudolph,

I'd like you to reexamine a change. Please visit

https://review.coreboot.org/c/coreboot/+/58018

to look at the new patch set (#10).

Change subject: soc/intel/pmc: add a note about legacy OSes/payloads to PM Timer Kconfig
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soc/intel/pmc: add a note about legacy OSes/payloads to PM Timer Kconfig

Since ACPI 5.0A it is allowed to disable the ACPI Timer, when the
according FADT flag `ACPI_FADT_PLATFORM_CLOCK` is unset.

Starting with Skylake, most platforms (except Xeon-SP) support PM Timer
emulation, so even legacy OSes and payloads should work fine with the
hardware PM Timer disabled. However, when the `TMR_STS` functionality
is required, some legacy OSes might still not work (properly).

Add a note about this to the Kconfig help.

Change-Id: I53f1814113902124779ed85da030374439570688
Signed-off-by: Michael Niewöhner 
---
M src/soc/intel/common/block/pmc/Kconfig
1 file changed, 6 insertions(+), 0 deletions(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/18/58018/10