diff --git a/src/mainboard/system76/addw1/cmos.layout b/src/mainboard/system76/addw1/cmos.layout
index a53c3f4..0513315 100644
--- a/src/mainboard/system76/addw1/cmos.layout
+++ b/src/mainboard/system76/addw1/cmos.layout
@@ -14,6 +14,7 @@
 412	4	e	6	debug_level
 416	1	e	2	me_state
 417	3	h	0	me_state_counter
+904	80	h	0	ramtop
 984	16	h	0	check_sum
 
 enumerations
diff --git a/src/mainboard/system76/adl/cmos.layout b/src/mainboard/system76/adl/cmos.layout
index a53c3f4..0513315 100644
--- a/src/mainboard/system76/adl/cmos.layout
+++ b/src/mainboard/system76/adl/cmos.layout
@@ -14,6 +14,7 @@
 412	4	e	6	debug_level
 416	1	e	2	me_state
 417	3	h	0	me_state_counter
+904	80	h	0	ramtop
 984	16	h	0	check_sum
 
 enumerations
diff --git a/src/mainboard/system76/bonw14/cmos.layout b/src/mainboard/system76/bonw14/cmos.layout
index a53c3f4..0513315 100644
--- a/src/mainboard/system76/bonw14/cmos.layout
+++ b/src/mainboard/system76/bonw14/cmos.layout
@@ -14,6 +14,7 @@
 412	4	e	6	debug_level
 416	1	e	2	me_state
 417	3	h	0	me_state_counter
+904	80	h	0	ramtop
 984	16	h	0	check_sum
 
 enumerations
diff --git a/src/mainboard/system76/cml-u/cmos.layout b/src/mainboard/system76/cml-u/cmos.layout
index a53c3f4..0513315 100644
--- a/src/mainboard/system76/cml-u/cmos.layout
+++ b/src/mainboard/system76/cml-u/cmos.layout
@@ -14,6 +14,7 @@
 412	4	e	6	debug_level
 416	1	e	2	me_state
 417	3	h	0	me_state_counter
+904	80	h	0	ramtop
 984	16	h	0	check_sum
 
 enumerations
diff --git a/src/mainboard/system76/gaze15/cmos.layout b/src/mainboard/system76/gaze15/cmos.layout
index a53c3f4..0513315 100644
--- a/src/mainboard/system76/gaze15/cmos.layout
+++ b/src/mainboard/system76/gaze15/cmos.layout
@@ -14,6 +14,7 @@
 412	4	e	6	debug_level
 416	1	e	2	me_state
 417	3	h	0	me_state_counter
+904	80	h	0	ramtop
 984	16	h	0	check_sum
 
 enumerations
diff --git a/src/mainboard/system76/kbl-u/cmos.layout b/src/mainboard/system76/kbl-u/cmos.layout
index ac81752..4e9a300 100644
--- a/src/mainboard/system76/kbl-u/cmos.layout
+++ b/src/mainboard/system76/kbl-u/cmos.layout
@@ -12,6 +12,7 @@
 400	8	r	0	century
 
 412	4	e	6	debug_level
+904	80	h	0	ramtop
 984	16	h	0	check_sum
 
 enumerations
diff --git a/src/mainboard/system76/oryp5/cmos.layout b/src/mainboard/system76/oryp5/cmos.layout
index a53c3f4..0513315 100644
--- a/src/mainboard/system76/oryp5/cmos.layout
+++ b/src/mainboard/system76/oryp5/cmos.layout
@@ -14,6 +14,7 @@
 412	4	e	6	debug_level
 416	1	e	2	me_state
 417	3	h	0	me_state_counter
+904	80	h	0	ramtop
 984	16	h	0	check_sum
 
 enumerations
diff --git a/src/mainboard/system76/oryp6/cmos.layout b/src/mainboard/system76/oryp6/cmos.layout
index a53c3f4..0513315 100644
--- a/src/mainboard/system76/oryp6/cmos.layout
+++ b/src/mainboard/system76/oryp6/cmos.layout
@@ -14,6 +14,7 @@
 412	4	e	6	debug_level
 416	1	e	2	me_state
 417	3	h	0	me_state_counter
+904	80	h	0	ramtop
 984	16	h	0	check_sum
 
 enumerations
diff --git a/src/mainboard/system76/rpl/cmos.layout b/src/mainboard/system76/rpl/cmos.layout
index a53c3f4..0513315 100644
--- a/src/mainboard/system76/rpl/cmos.layout
+++ b/src/mainboard/system76/rpl/cmos.layout
@@ -14,6 +14,7 @@
 412	4	e	6	debug_level
 416	1	e	2	me_state
 417	3	h	0	me_state_counter
+904	80	h	0	ramtop
 984	16	h	0	check_sum
 
 enumerations
diff --git a/src/mainboard/system76/tgl-h/cmos.layout b/src/mainboard/system76/tgl-h/cmos.layout
index a53c3f4..0513315 100644
--- a/src/mainboard/system76/tgl-h/cmos.layout
+++ b/src/mainboard/system76/tgl-h/cmos.layout
@@ -14,6 +14,7 @@
 412	4	e	6	debug_level
 416	1	e	2	me_state
 417	3	h	0	me_state_counter
+904	80	h	0	ramtop
 984	16	h	0	check_sum
 
 enumerations
diff --git a/src/mainboard/system76/tgl-u/cmos.layout b/src/mainboard/system76/tgl-u/cmos.layout
index a53c3f4..0513315 100644
--- a/src/mainboard/system76/tgl-u/cmos.layout
+++ b/src/mainboard/system76/tgl-u/cmos.layout
@@ -14,6 +14,7 @@
 412	4	e	6	debug_level
 416	1	e	2	me_state
 417	3	h	0	me_state_counter
+904	80	h	0	ramtop
 984	16	h	0	check_sum
 
 enumerations
diff --git a/src/mainboard/system76/whl-u/cmos.layout b/src/mainboard/system76/whl-u/cmos.layout
index a53c3f4..0513315 100644
--- a/src/mainboard/system76/whl-u/cmos.layout
+++ b/src/mainboard/system76/whl-u/cmos.layout
@@ -14,6 +14,7 @@
 412	4	e	6	debug_level
 416	1	e	2	me_state
 417	3	h	0	me_state_counter
+904	80	h	0	ramtop
 984	16	h	0	check_sum
 
 enumerations