cpu/x86/Kconfig: Add SMM Kconfig help
Signed-off-by: Maximilian Brune <maximilian.brune@9elements.com>
Change-Id: Ia0a5c48c6314f53c4ed72958f5d6f839f0a5c2ca
Reviewed-on: https://review.coreboot.org/c/coreboot/+/77973
Reviewed-by: Nico Huber <nico.h@gmx.de>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
diff --git a/src/cpu/x86/Kconfig b/src/cpu/x86/Kconfig
index 417989d..828c0f9 100644
--- a/src/cpu/x86/Kconfig
+++ b/src/cpu/x86/Kconfig
@@ -163,11 +163,19 @@
bool
default n
depends on !NO_SMM
+ help
+ Legacy memory region of SMM (System Management Mode). It has been
+ replaced by TSEG and is currently only used for QEMU emulation target.
config SMM_TSEG
bool
default y
depends on !(NO_SMM || SMM_ASEG)
+ help
+ Top of Low Memory Segment (TSEG) is comprised of the SMRAM and IEDRAM.
+ SMRAM is a memory region used in SMM (System Management Mode) only.
+ IEDRAM is a memory region used for enhanced debug features.
+ SMM-mode processor access to TSEG always targets the physical DRAM.
if HAVE_SMI_HANDLER