From ab4b220a35bee0b40f07dd55a3bfd18f4ee93de8 Mon Sep 17 00:00:00 2001 From: Maximilian Brune Date: Mon, 18 Sep 2023 00:44:33 +0200 Subject: [PATCH] cpu/x86/Kconfig: Add SMM Kconfig help Signed-off-by: Maximilian Brune Change-Id: Ia0a5c48c6314f53c4ed72958f5d6f839f0a5c2ca Reviewed-on: https://review.coreboot.org/c/coreboot/+/77973 Reviewed-by: Nico Huber Tested-by: build bot (Jenkins) --- src/cpu/x86/Kconfig | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/src/cpu/x86/Kconfig b/src/cpu/x86/Kconfig index 417989d764..828c0f9ce2 100644 --- a/src/cpu/x86/Kconfig +++ b/src/cpu/x86/Kconfig @@ -163,11 +163,19 @@ config SMM_ASEG 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