[coreboot-gerrit] Change in coreboot[master]: lib: add ENV_SMM check to setup_preram_cache

[Josie Nordrum (Code Review)]

Josie Nordrum has uploaded this change for review. ( https://review.coreboot.org/c/coreboot/+/45274 )

Change subject: lib: add ENV_SMM check to setup_preram_cache
......................................................................

lib: add ENV_SMM check to setup_preram_cache

Add check in setup_preram_cache to return if ENV_SMM is true.
This avoids false warning that post-RAM FMAP is accessed too early
caused by ENV_ROMSTAGE_OR_BEFORE evaluation in SMI handler.

BUG=b:167321319
BRANCH=None
TEST=None

Signed-Off-By: Josie Nordrum 
Change-Id: I3a4c199c42ee556187d6c4277e8793a36e4d493b
---
M src/lib/fmap.c
1 file changed, 3 insertions(+), 0 deletions(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/74/45274/1

diff --git a/src/lib/fmap.c b/src/lib/fmap.c
index e1e6a57..fc51122 100644
--- a/src/lib/fmap.c
+++ b/src/lib/fmap.c
@@ -46,6 +46,9 @@
    if (CONFIG(NO_FMAP_CACHE))
    	return;

+	if (ENV_SMM)
+		return;
+
    if (!ENV_ROMSTAGE_OR_BEFORE) {
    	/* We get here if ramstage makes an FMAP access before calling
    	   cbmem_initialize(). We should avoid letting it come to that,