diff --git a/ports/stm32/Makefile b/ports/stm32/Makefile
index 50ac48e5a1..497e409c66 100644
--- a/ports/stm32/Makefile
+++ b/ports/stm32/Makefile
@@ -13,6 +13,12 @@ ifeq ($(wildcard $(BOARD_DIR)/.),)
 $(error Invalid BOARD specified: $(BOARD_DIR))
 endif
 
+ifneq ($(BOARD_VARIANT),)
+ifeq ($(wildcard $(BOARD_DIR)/mpconfigvariant_$(BOARD_VARIANT).mk),)
+$(error Invalid BOARD_VARIANT specified: $(BOARD_VARIANT))
+endif
+endif
+
 # If the build directory is not given, make it reflect the board name (and
 # optionally the board variant).
 ifneq ($(BOARD_VARIANT),)
@@ -23,7 +29,14 @@ endif
 
 include ../../py/mkenv.mk
 -include mpconfigport.mk
+
+# Include board specific .mk file, and optional board variant .mk file.
 include $(BOARD_DIR)/mpconfigboard.mk
+ifeq ($(BOARD_VARIANT),)
+-include $(BOARD_DIR)/mpconfigvariant.mk
+else
+include $(BOARD_DIR)/mpconfigvariant_$(BOARD_VARIANT).mk
+endif
 
 # qstr definitions (must come before including py.mk)
 QSTR_DEFS += qstrdefsport.h
diff --git a/ports/stm32/boards/PYBLITEV10/mpconfigboard.mk b/ports/stm32/boards/PYBLITEV10/mpconfigboard.mk
index 1fe609cbb5..603fa8865e 100644
--- a/ports/stm32/boards/PYBLITEV10/mpconfigboard.mk
+++ b/ports/stm32/boards/PYBLITEV10/mpconfigboard.mk
@@ -5,23 +5,5 @@ LD_FILES = boards/stm32f411.ld boards/common_ifs.ld
 TEXT0_ADDR = 0x08000000
 TEXT1_ADDR = 0x08020000
 
-# Provide different variants for the downloads page.
-ifeq ($(BOARD_VARIANT),DP)
-MICROPY_FLOAT_IMPL=double
-endif
-
-ifeq ($(BOARD_VARIANT),THREAD)
-CFLAGS += -DMICROPY_PY_THREAD=1
-endif
-
-ifeq ($(BOARD_VARIANT),DP_THREAD)
-MICROPY_FLOAT_IMPL=double
-CFLAGS += -DMICROPY_PY_THREAD=1
-endif
-
-ifeq ($(BOARD_VARIANT),NETWORK)
-MICROPY_PY_NETWORK_WIZNET5K=5200
-endif
-
 # PYB-specific frozen modules
 FROZEN_MANIFEST ?= boards/PYBV10/manifest.py
diff --git a/ports/stm32/boards/PYBLITEV10/mpconfigvariant_DP.mk b/ports/stm32/boards/PYBLITEV10/mpconfigvariant_DP.mk
new file mode 100644
index 0000000000..73b32b4901
--- /dev/null
+++ b/ports/stm32/boards/PYBLITEV10/mpconfigvariant_DP.mk
@@ -0,0 +1 @@
+MICROPY_FLOAT_IMPL = double
diff --git a/ports/stm32/boards/PYBLITEV10/mpconfigvariant_DP_THREAD.mk b/ports/stm32/boards/PYBLITEV10/mpconfigvariant_DP_THREAD.mk
new file mode 100644
index 0000000000..af6ec87ecf
--- /dev/null
+++ b/ports/stm32/boards/PYBLITEV10/mpconfigvariant_DP_THREAD.mk
@@ -0,0 +1,2 @@
+MICROPY_FLOAT_IMPL = double
+CFLAGS += -DMICROPY_PY_THREAD=1
diff --git a/ports/stm32/boards/PYBLITEV10/mpconfigvariant_NETWORK.mk b/ports/stm32/boards/PYBLITEV10/mpconfigvariant_NETWORK.mk
new file mode 100644
index 0000000000..2e2988aa93
--- /dev/null
+++ b/ports/stm32/boards/PYBLITEV10/mpconfigvariant_NETWORK.mk
@@ -0,0 +1 @@
+MICROPY_PY_NETWORK_WIZNET5K = 5200
diff --git a/ports/stm32/boards/PYBLITEV10/mpconfigvariant_THREAD.mk b/ports/stm32/boards/PYBLITEV10/mpconfigvariant_THREAD.mk
new file mode 100644
index 0000000000..eab5c1c0d2
--- /dev/null
+++ b/ports/stm32/boards/PYBLITEV10/mpconfigvariant_THREAD.mk
@@ -0,0 +1 @@
+CFLAGS += -DMICROPY_PY_THREAD=1
diff --git a/ports/stm32/boards/PYBV10/mpconfigboard.mk b/ports/stm32/boards/PYBV10/mpconfigboard.mk
index 1a4d676319..38f0b55f6c 100644
--- a/ports/stm32/boards/PYBV10/mpconfigboard.mk
+++ b/ports/stm32/boards/PYBV10/mpconfigboard.mk
@@ -15,23 +15,5 @@ endif
 # MicroPython settings
 MICROPY_VFS_LFS2 = 1
 
-# Provide different variants for the downloads page.
-ifeq ($(BOARD_VARIANT),DP)
-MICROPY_FLOAT_IMPL=double
-endif
-
-ifeq ($(BOARD_VARIANT),THREAD)
-CFLAGS += -DMICROPY_PY_THREAD=1
-endif
-
-ifeq ($(BOARD_VARIANT),DP_THREAD)
-MICROPY_FLOAT_IMPL=double
-CFLAGS += -DMICROPY_PY_THREAD=1
-endif
-
-ifeq ($(BOARD_VARIANT),NETWORK)
-MICROPY_PY_NETWORK_WIZNET5K=5200
-endif
-
 # PYB-specific frozen modules
 FROZEN_MANIFEST ?= $(BOARD_DIR)/manifest.py
diff --git a/ports/stm32/boards/PYBV10/mpconfigvariant_DP.mk b/ports/stm32/boards/PYBV10/mpconfigvariant_DP.mk
new file mode 100644
index 0000000000..73b32b4901
--- /dev/null
+++ b/ports/stm32/boards/PYBV10/mpconfigvariant_DP.mk
@@ -0,0 +1 @@
+MICROPY_FLOAT_IMPL = double
diff --git a/ports/stm32/boards/PYBV10/mpconfigvariant_DP_THREAD.mk b/ports/stm32/boards/PYBV10/mpconfigvariant_DP_THREAD.mk
new file mode 100644
index 0000000000..af6ec87ecf
--- /dev/null
+++ b/ports/stm32/boards/PYBV10/mpconfigvariant_DP_THREAD.mk
@@ -0,0 +1,2 @@
+MICROPY_FLOAT_IMPL = double
+CFLAGS += -DMICROPY_PY_THREAD=1
diff --git a/ports/stm32/boards/PYBV10/mpconfigvariant_NETWORK.mk b/ports/stm32/boards/PYBV10/mpconfigvariant_NETWORK.mk
new file mode 100644
index 0000000000..2e2988aa93
--- /dev/null
+++ b/ports/stm32/boards/PYBV10/mpconfigvariant_NETWORK.mk
@@ -0,0 +1 @@
+MICROPY_PY_NETWORK_WIZNET5K = 5200
diff --git a/ports/stm32/boards/PYBV10/mpconfigvariant_THREAD.mk b/ports/stm32/boards/PYBV10/mpconfigvariant_THREAD.mk
new file mode 100644
index 0000000000..eab5c1c0d2
--- /dev/null
+++ b/ports/stm32/boards/PYBV10/mpconfigvariant_THREAD.mk
@@ -0,0 +1 @@
+CFLAGS += -DMICROPY_PY_THREAD=1
diff --git a/ports/stm32/boards/PYBV11/mpconfigboard.mk b/ports/stm32/boards/PYBV11/mpconfigboard.mk
index 6dcb2fd1b4..89e4a1d8a4 100644
--- a/ports/stm32/boards/PYBV11/mpconfigboard.mk
+++ b/ports/stm32/boards/PYBV11/mpconfigboard.mk
@@ -15,23 +15,5 @@ endif
 # MicroPython settings
 MICROPY_VFS_LFS2 = 1
 
-# Provide different variants for the downloads page.
-ifeq ($(BOARD_VARIANT),DP)
-MICROPY_FLOAT_IMPL=double
-endif
-
-ifeq ($(BOARD_VARIANT),THREAD)
-CFLAGS += -DMICROPY_PY_THREAD=1
-endif
-
-ifeq ($(BOARD_VARIANT),DP_THREAD)
-MICROPY_FLOAT_IMPL=double
-CFLAGS += -DMICROPY_PY_THREAD=1
-endif
-
-ifeq ($(BOARD_VARIANT),NETWORK)
-MICROPY_PY_NETWORK_WIZNET5K=5200
-endif
-
 # PYB-specific frozen modules
 FROZEN_MANIFEST ?= boards/PYBV10/manifest.py
diff --git a/ports/stm32/boards/PYBV11/mpconfigvariant_DP.mk b/ports/stm32/boards/PYBV11/mpconfigvariant_DP.mk
new file mode 100644
index 0000000000..73b32b4901
--- /dev/null
+++ b/ports/stm32/boards/PYBV11/mpconfigvariant_DP.mk
@@ -0,0 +1 @@
+MICROPY_FLOAT_IMPL = double
diff --git a/ports/stm32/boards/PYBV11/mpconfigvariant_DP_THREAD.mk b/ports/stm32/boards/PYBV11/mpconfigvariant_DP_THREAD.mk
new file mode 100644
index 0000000000..af6ec87ecf
--- /dev/null
+++ b/ports/stm32/boards/PYBV11/mpconfigvariant_DP_THREAD.mk
@@ -0,0 +1,2 @@
+MICROPY_FLOAT_IMPL = double
+CFLAGS += -DMICROPY_PY_THREAD=1
diff --git a/ports/stm32/boards/PYBV11/mpconfigvariant_NETWORK.mk b/ports/stm32/boards/PYBV11/mpconfigvariant_NETWORK.mk
new file mode 100644
index 0000000000..2e2988aa93
--- /dev/null
+++ b/ports/stm32/boards/PYBV11/mpconfigvariant_NETWORK.mk
@@ -0,0 +1 @@
+MICROPY_PY_NETWORK_WIZNET5K = 5200
diff --git a/ports/stm32/boards/PYBV11/mpconfigvariant_THREAD.mk b/ports/stm32/boards/PYBV11/mpconfigvariant_THREAD.mk
new file mode 100644
index 0000000000..eab5c1c0d2
--- /dev/null
+++ b/ports/stm32/boards/PYBV11/mpconfigvariant_THREAD.mk
@@ -0,0 +1 @@
+CFLAGS += -DMICROPY_PY_THREAD=1