diff --git a/src/mainboard/google/butterfly/romstage.c b/src/mainboard/google/butterfly/romstage.c
index a300ff6958..ebcba8409c 100644
--- a/src/mainboard/google/butterfly/romstage.c
+++ b/src/mainboard/google/butterfly/romstage.c
@@ -96,9 +96,9 @@ void mainboard_rcba_config(void)
 	DIR_ROUTE(D22IR, PIRQA, PIRQB, PIRQC, PIRQD);
 
 	/* Enable IOAPIC (generic) */
-	RCBA16(OIC) = 0x0100;
+	RCBA16(EOIC) = 0x0100;
 	/* PCH BWG says to read back the IOAPIC enable register */
-	(void) RCBA16(OIC);
+	(void) RCBA16(EOIC);
 
 	/* Disable unused devices (board specific) */
 	reg32 = RCBA32(FD);
diff --git a/src/mainboard/google/link/romstage.c b/src/mainboard/google/link/romstage.c
index 544bb4af6e..a1bbe34a4b 100644
--- a/src/mainboard/google/link/romstage.c
+++ b/src/mainboard/google/link/romstage.c
@@ -104,9 +104,9 @@ void mainboard_rcba_config(void)
 	DIR_ROUTE(D22IR, PIRQA, PIRQB, PIRQC, PIRQD);
 
 	/* Enable IOAPIC (generic) */
-	RCBA16(OIC) = 0x0100;
+	RCBA16(EOIC) = 0x0100;
 	/* PCH BWG says to read back the IOAPIC enable register */
-	(void) RCBA16(OIC);
+	(void) RCBA16(EOIC);
 }
 
 static uint8_t *locate_spd(void)
diff --git a/src/mainboard/google/parrot/romstage.c b/src/mainboard/google/parrot/romstage.c
index 3b7c24279b..12c11141c2 100644
--- a/src/mainboard/google/parrot/romstage.c
+++ b/src/mainboard/google/parrot/romstage.c
@@ -95,9 +95,9 @@ void mainboard_rcba_config(void)
 	DIR_ROUTE(D22IR, PIRQA, PIRQB, PIRQC, PIRQD);
 
 	/* Enable IOAPIC (generic) */
-	RCBA16(OIC) = 0x0100;
+	RCBA16(EOIC) = 0x0100;
 	/* PCH BWG says to read back the IOAPIC enable register */
-	(void) RCBA16(OIC);
+	(void) RCBA16(EOIC);
 
 	/* Disable unused devices (board specific) */
 	reg32 = RCBA32(FD);
diff --git a/src/mainboard/google/stout/romstage.c b/src/mainboard/google/stout/romstage.c
index ffa2157c8f..4f7f869a9c 100644
--- a/src/mainboard/google/stout/romstage.c
+++ b/src/mainboard/google/stout/romstage.c
@@ -101,9 +101,9 @@ void mainboard_rcba_config(void)
 	DIR_ROUTE(D20IR, PIRQD, PIRQE, PIRQF, PIRQG);
 
 	/* Enable IOAPIC (generic) */
-	RCBA16(OIC) = 0x0100;
+	RCBA16(EOIC) = 0x0100;
 	/* PCH BWG says to read back the IOAPIC enable register */
-	(void) RCBA16(OIC);
+	(void) RCBA16(EOIC);
 
 	/* Disable unused devices (board specific) */
 	reg32 = RCBA32(FD);
diff --git a/src/mainboard/samsung/lumpy/romstage.c b/src/mainboard/samsung/lumpy/romstage.c
index d7ed4350b6..ce1706810d 100644
--- a/src/mainboard/samsung/lumpy/romstage.c
+++ b/src/mainboard/samsung/lumpy/romstage.c
@@ -103,9 +103,9 @@ void mainboard_rcba_config(void)
 	DIR_ROUTE(D22IR, PIRQA, PIRQB, PIRQC, PIRQD);
 
 	/* Enable IOAPIC (generic) */
-	RCBA16(OIC) = 0x0100;
+	RCBA16(EOIC) = 0x0100;
 	/* PCH BWG says to read back the IOAPIC enable register */
-	(void) RCBA16(OIC);
+	(void) RCBA16(EOIC);
 }
 
 static const uint8_t *locate_spd(void)
diff --git a/src/mainboard/samsung/stumpy/romstage.c b/src/mainboard/samsung/stumpy/romstage.c
index 265530c56f..1b5d2ae2d1 100644
--- a/src/mainboard/samsung/stumpy/romstage.c
+++ b/src/mainboard/samsung/stumpy/romstage.c
@@ -112,9 +112,9 @@ void mainboard_rcba_config(void)
 	DIR_ROUTE(D22IR, PIRQA, PIRQB, PIRQC, PIRQD);
 
 	/* Enable IOAPIC (generic) */
-	RCBA16(OIC) = 0x0100;
+	RCBA16(EOIC) = 0x0100;
 	/* PCH BWG says to read back the IOAPIC enable register */
-	(void) RCBA16(OIC);
+	(void) RCBA16(EOIC);
 }
 
 static void setup_sio_gpios(void)
diff --git a/src/southbridge/intel/bd82x6x/early_rcba.c b/src/southbridge/intel/bd82x6x/early_rcba.c
index 990ff0d874..9ce9dc9d41 100644
--- a/src/southbridge/intel/bd82x6x/early_rcba.c
+++ b/src/southbridge/intel/bd82x6x/early_rcba.c
@@ -60,9 +60,9 @@ southbridge_configure_default_intmap(void)
 	DIR_ROUTE(D22IR, PIRQA, PIRQB, PIRQC, PIRQD);
 
 	/* Enable IOAPIC (generic) */
-	RCBA16(OIC) = 0x0100;
+	RCBA16(EOIC) = 0x0100;
 	/* PCH BWG says to read back the IOAPIC enable register */
-	(void) RCBA16(OIC);
+	(void) RCBA16(EOIC);
 }
 
 void
diff --git a/src/southbridge/intel/common/rcba.h b/src/southbridge/intel/common/rcba.h
index 1399fdef90..ad8285a500 100644
--- a/src/southbridge/intel/common/rcba.h
+++ b/src/southbridge/intel/common/rcba.h
@@ -147,6 +147,7 @@
 #define D20IR		0x3160	/* 16bit */
 #define D19IR		0x3168	/* 16bit */
 
+#define EOIC		0x31fe	/* 16bit */
 #define OIC		0x31ff	/*  8bit */
 
 #define DIR_ROUTE(x, a, b, c, d) \