diff --git a/src/mainboard/amd/birman/chromeos_glinda.fmd b/src/mainboard/amd/birman/chromeos_glinda.fmd
index 843a026..66227c2 100644
--- a/src/mainboard/amd/birman/chromeos_glinda.fmd
+++ b/src/mainboard/amd/birman/chromeos_glinda.fmd
@@ -27,7 +27,7 @@
 		}
 		RW_VPD(PRESERVE) 8K
 		RW_NVRAM(PRESERVE) 20K
-		SMMSTORE(PRESERVE) 64K
+		SMMSTORE(PRESERVE) 256K
 		RW_LEGACY(CBFS)
 		EC_BODY@15872K 256K
 		RW_MRC_CACHE(PRESERVE) 120K
diff --git a/src/mainboard/amd/birman/chromeos_phoenix.fmd b/src/mainboard/amd/birman/chromeos_phoenix.fmd
index 9d6d402..420ed6e 100644
--- a/src/mainboard/amd/birman/chromeos_phoenix.fmd
+++ b/src/mainboard/amd/birman/chromeos_phoenix.fmd
@@ -27,7 +27,7 @@
 		}
 		RW_VPD(PRESERVE) 8K
 		RW_NVRAM(PRESERVE) 20K
-		SMMSTORE(PRESERVE) 64K
+		SMMSTORE(PRESERVE) 256K
 		RW_LEGACY(CBFS)
 		EC_BODY@15872K 256K
 		RW_MRC_CACHE(PRESERVE) 256K
diff --git a/src/mainboard/amd/birman_plus/chromeos_glinda.fmd b/src/mainboard/amd/birman_plus/chromeos_glinda.fmd
index 843a026..66227c2 100644
--- a/src/mainboard/amd/birman_plus/chromeos_glinda.fmd
+++ b/src/mainboard/amd/birman_plus/chromeos_glinda.fmd
@@ -27,7 +27,7 @@
 		}
 		RW_VPD(PRESERVE) 8K
 		RW_NVRAM(PRESERVE) 20K
-		SMMSTORE(PRESERVE) 64K
+		SMMSTORE(PRESERVE) 256K
 		RW_LEGACY(CBFS)
 		EC_BODY@15872K 256K
 		RW_MRC_CACHE(PRESERVE) 120K
diff --git a/src/mainboard/amd/birman_plus/chromeos_phoenix.fmd b/src/mainboard/amd/birman_plus/chromeos_phoenix.fmd
index 9d6d402..420ed6e 100644
--- a/src/mainboard/amd/birman_plus/chromeos_phoenix.fmd
+++ b/src/mainboard/amd/birman_plus/chromeos_phoenix.fmd
@@ -27,7 +27,7 @@
 		}
 		RW_VPD(PRESERVE) 8K
 		RW_NVRAM(PRESERVE) 20K
-		SMMSTORE(PRESERVE) 64K
+		SMMSTORE(PRESERVE) 256K
 		RW_LEGACY(CBFS)
 		EC_BODY@15872K 256K
 		RW_MRC_CACHE(PRESERVE) 256K
diff --git a/src/mainboard/amd/chausie/chromeos.fmd b/src/mainboard/amd/chausie/chromeos.fmd
index a27d5c3..c0e02dd 100644
--- a/src/mainboard/amd/chausie/chromeos.fmd
+++ b/src/mainboard/amd/chausie/chromeos.fmd
@@ -19,7 +19,7 @@
 		}
 		RW_VPD(PRESERVE) 8K
 		RW_NVRAM(PRESERVE) 20K
-		SMMSTORE(PRESERVE) 4K
+		SMMSTORE(PRESERVE) 256K
 		RW_LEGACY(CBFS)
 		WP_RO@10M 6M {
 			RO_VPD(PRESERVE) 16K
diff --git a/src/mainboard/amd/majolica/chromeos.fmd b/src/mainboard/amd/majolica/chromeos.fmd
index bb21767..1a1d96b 100644
--- a/src/mainboard/amd/majolica/chromeos.fmd
+++ b/src/mainboard/amd/majolica/chromeos.fmd
@@ -19,7 +19,7 @@
 		}
 		RW_VPD(PRESERVE) 8K
 		RW_NVRAM(PRESERVE) 20K
-		SMMSTORE(PRESERVE) 4K
+		SMMSTORE(PRESERVE) 256K
 		RW_LEGACY(CBFS)
 		WP_RO@8M 8M {
 			RO_VPD(PRESERVE) 16K
diff --git a/src/mainboard/amd/mayan/chromeos.fmd b/src/mainboard/amd/mayan/chromeos.fmd
index dca61fc..b70d561 100644
--- a/src/mainboard/amd/mayan/chromeos.fmd
+++ b/src/mainboard/amd/mayan/chromeos.fmd
@@ -27,7 +27,7 @@
 		}
 		RW_VPD(PRESERVE) 8K
 		RW_NVRAM(PRESERVE) 20K
-		SMMSTORE(PRESERVE) 64K
+		SMMSTORE(PRESERVE) 256K
 		RW_LEGACY(CBFS)
 		RW_MRC_CACHE(PRESERVE) 256K
 	}