diff --git a/src/ec/starlabs/merlin/variants/apl/ecdefs.h b/src/ec/starlabs/merlin/variants/apl/ecdefs.h
index e4857aa027..cca0bdc1bd 100644
--- a/src/ec/starlabs/merlin/variants/apl/ecdefs.h
+++ b/src/ec/starlabs/merlin/variants/apl/ecdefs.h
@@ -20,6 +20,5 @@
 #define ECRAM_MAX_CHARGE	dead_code_t(uint8_t)
 #define ECRAM_FAN_MODE		dead_code_t(uint8_t)
 #define ECRAM_FAST_CHARGE	dead_code_t(uint8_t)
-#define ECRAM_MIRROR_FLAG	0x04
 
 #endif
diff --git a/src/ec/starlabs/merlin/variants/cezanne/ecdefs.h b/src/ec/starlabs/merlin/variants/cezanne/ecdefs.h
index 0c522cc845..6942c391a3 100644
--- a/src/ec/starlabs/merlin/variants/cezanne/ecdefs.h
+++ b/src/ec/starlabs/merlin/variants/cezanne/ecdefs.h
@@ -23,6 +23,5 @@
 #define ECRAM_KBL_BRIGHTNESS	0x36
 #define ECRAM_FN_LOCK_STATE	0x70
 #define ECRAM_FAST_CHARGE	dead_code_t(uint8_t)
-#define ECRAM_MIRROR_FLAG	0x05
 
 #endif
diff --git a/src/ec/starlabs/merlin/variants/glk/ecdefs.h b/src/ec/starlabs/merlin/variants/glk/ecdefs.h
index c97e252bf4..8130bd17d4 100644
--- a/src/ec/starlabs/merlin/variants/glk/ecdefs.h
+++ b/src/ec/starlabs/merlin/variants/glk/ecdefs.h
@@ -20,6 +20,5 @@
 #define ECRAM_MAX_CHARGE	dead_code_t(uint8_t)
 #define ECRAM_FAN_MODE		dead_code_t(uint8_t)
 #define ECRAM_FAST_CHARGE	dead_code_t(uint8_t)
-#define ECRAM_MIRROR_FLAG	0x04
 
 #endif
diff --git a/src/ec/starlabs/merlin/variants/glkr/ecdefs.h b/src/ec/starlabs/merlin/variants/glkr/ecdefs.h
index ecc117c990..038c378fb2 100644
--- a/src/ec/starlabs/merlin/variants/glkr/ecdefs.h
+++ b/src/ec/starlabs/merlin/variants/glkr/ecdefs.h
@@ -23,6 +23,5 @@
 #define ECRAM_MAX_CHARGE	dead_code_t(uint8_t)
 #define ECRAM_FAN_MODE		dead_code_t(uint8_t)
 #define ECRAM_FAST_CHARGE       0x18
-#define ECRAM_MIRROR_FLAG	dead_code_t(uint8_t)
 
 #endif
diff --git a/src/ec/starlabs/merlin/variants/kbl/ecdefs.h b/src/ec/starlabs/merlin/variants/kbl/ecdefs.h
index deda3ae362..5ba8ad64b1 100644
--- a/src/ec/starlabs/merlin/variants/kbl/ecdefs.h
+++ b/src/ec/starlabs/merlin/variants/kbl/ecdefs.h
@@ -20,6 +20,5 @@
 #define ECRAM_FN_CTRL_REVERSE	0x43
 #define ECRAM_MAX_CHARGE	dead_code_t(uint8_t)
 #define ECRAM_FAST_CHARGE	dead_code_t(uint8_t)
-#define ECRAM_MIRROR_FLAG	0x04
 
 #endif
diff --git a/src/ec/starlabs/merlin/variants/merlin/ecdefs.h b/src/ec/starlabs/merlin/variants/merlin/ecdefs.h
index d5caf8a9ae..8127027fcb 100644
--- a/src/ec/starlabs/merlin/variants/merlin/ecdefs.h
+++ b/src/ec/starlabs/merlin/variants/merlin/ecdefs.h
@@ -20,6 +20,5 @@
 #define ECRAM_MAX_CHARGE	0x1a
 #define ECRAM_FAN_MODE		0x1b
 #define ECRAM_FAST_CHARGE	dead_code_t(uint8_t)
-#define ECRAM_MIRROR_FLAG	0x05
 
 #endif
diff --git a/src/mainboard/starlabs/byte_adl/cmos.default b/src/mainboard/starlabs/byte_adl/cmos.default
index ddb2d289db..43a1394c07 100644
--- a/src/mainboard/starlabs/byte_adl/cmos.default
+++ b/src/mainboard/starlabs/byte_adl/cmos.default
@@ -11,5 +11,3 @@ me_state=Disable
 # Devices
 wireless=Enable
 webcam=Enable
-# EC
-mirror_flag=Disable
diff --git a/src/mainboard/starlabs/starlite_adl/cmos.default b/src/mainboard/starlabs/starlite_adl/cmos.default
index 353d551f38..c2c7adfe6a 100644
--- a/src/mainboard/starlabs/starlite_adl/cmos.default
+++ b/src/mainboard/starlabs/starlite_adl/cmos.default
@@ -13,5 +13,3 @@ wireless=Enable
 webcam=Enable
 camera=Enable
 microphone=Enable
-# EC
-mirror_flag=Disable
diff --git a/src/mainboard/starlabs/starlite_adl/cmos.layout b/src/mainboard/starlabs/starlite_adl/cmos.layout
index 668b2cadca..2f2ef41492 100644
--- a/src/mainboard/starlabs/starlite_adl/cmos.layout
+++ b/src/mainboard/starlabs/starlite_adl/cmos.layout
@@ -33,8 +33,6 @@ entries
 
 # coreboot config options: EC
 600	2	e	6	max_charge
-608	1	e	1	mirror_flag
-6616	4	h	0	mirror_flag_counter
 
 # coreboot config options: check sums
 984	16	h	0	check_sum