diff --git a/board/avionic-design/medcom-wide/Makefile b/board/avionic-design/medcom-wide/Makefile
index 864bc0e..e8c1e8b 100644
--- a/board/avionic-design/medcom-wide/Makefile
+++ b/board/avionic-design/medcom-wide/Makefile
@@ -29,9 +29,11 @@
 
 LIB	= $(obj)lib$(BOARD).o
 
-COBJS	:= ../../nvidia/common/board.o
-COBJS	+= ../common/tamonten.o
+COBJS-y	:= ../common/tamonten.o
+
+include ../../nvidia/common/common.mk
 
+COBJS	:= $(COBJS-y)
 SRCS	:= $(COBJS:.o=.c)
 OBJS	:= $(addprefix $(obj),$(COBJS))
 
diff --git a/board/avionic-design/plutux/Makefile b/board/avionic-design/plutux/Makefile
index 864bc0e..e8c1e8b 100644
--- a/board/avionic-design/plutux/Makefile
+++ b/board/avionic-design/plutux/Makefile
@@ -29,9 +29,11 @@
 
 LIB	= $(obj)lib$(BOARD).o
 
-COBJS	:= ../../nvidia/common/board.o
-COBJS	+= ../common/tamonten.o
+COBJS-y	:= ../common/tamonten.o
+
+include ../../nvidia/common/common.mk
 
+COBJS	:= $(COBJS-y)
 SRCS	:= $(COBJS:.o=.c)
 OBJS	:= $(addprefix $(obj),$(COBJS))
 
diff --git a/board/avionic-design/tec/Makefile b/board/avionic-design/tec/Makefile
index 864bc0e..e8c1e8b 100644
--- a/board/avionic-design/tec/Makefile
+++ b/board/avionic-design/tec/Makefile
@@ -29,9 +29,11 @@
 
 LIB	= $(obj)lib$(BOARD).o
 
-COBJS	:= ../../nvidia/common/board.o
-COBJS	+= ../common/tamonten.o
+COBJS-y	:= ../common/tamonten.o
+
+include ../../nvidia/common/common.mk
 
+COBJS	:= $(COBJS-y)
 SRCS	:= $(COBJS:.o=.c)
 OBJS	:= $(addprefix $(obj),$(COBJS))
 
diff --git a/board/compal/paz00/Makefile b/board/compal/paz00/Makefile
index 7f7287e..fa5c510 100644
--- a/board/compal/paz00/Makefile
+++ b/board/compal/paz00/Makefile
@@ -20,9 +20,11 @@
 
 LIB	= $(obj)lib$(BOARD).o
 
-COBJS	:= $(BOARD).o
-COBJS	+= ../../nvidia/common/board.o
+COBJS-y	:= $(BOARD).o
+
+include ../../nvidia/common/common.mk
 
+COBJS	:= $(COBJS-y)
 SRCS	:= $(COBJS:.o=.c)
 OBJS	:= $(addprefix $(obj),$(COBJS))
 
diff --git a/board/compulab/trimslice/Makefile b/board/compulab/trimslice/Makefile
index ff07879..cc844d2 100644
--- a/board/compulab/trimslice/Makefile
+++ b/board/compulab/trimslice/Makefile
@@ -28,9 +28,11 @@
 
 LIB	= $(obj)lib$(BOARD).o
 
-COBJS	:= $(BOARD).o
-COBJS	+= ../../nvidia/common/board.o
+COBJS-y	:= $(BOARD).o
+
+include ../../nvidia/common/common.mk
 
+COBJS	:= $(COBJS-y)
 SRCS	:= $(COBJS:.o=.c)
 OBJS	:= $(addprefix $(obj),$(COBJS))
 
diff --git a/board/nvidia/common/Makefile b/board/nvidia/common/Makefile
index a93d458..f6f419e 100644
--- a/board/nvidia/common/Makefile
+++ b/board/nvidia/common/Makefile
@@ -25,9 +25,7 @@
 
 LIB	= $(obj)lib$(VENDOR).o
 
-COBJS-y += board.o
-COBJS-$(CONFIG_SPI_UART_SWITCH) += uart-spi-switch.o
-COBJS-$(CONFIG_TEGRA_CLOCK_SCALING) += emc.o
+include common.mk
 
 COBJS	:= $(COBJS-y)
 SRCS	:= $(SOBJS:.o=.S) $(COBJS:.o=.c)
diff --git a/board/nvidia/common/common.mk b/board/nvidia/common/common.mk
new file mode 100644
index 0000000..bd6202c
--- /dev/null
+++ b/board/nvidia/common/common.mk
@@ -0,0 +1,4 @@
+# common options for all tegra boards
+COBJS-y	+= ../../nvidia/common/board.o
+COBJS-$(CONFIG_SPI_UART_SWITCH) += ../../nvidia/common/uart-spi-switch.o
+COBJS-$(CONFIG_TEGRA_CLOCK_SCALING) += ../../nvidia/common/emc.o