diff --git a/libraries/AP_HAL_ChibiOS/hwdef/Pixracer/hwdef-bl.dat b/libraries/AP_HAL_ChibiOS/hwdef/Pixracer/hwdef-bl.dat
new file mode 100644
index 0000000000..713f86d5b9
--- /dev/null
+++ b/libraries/AP_HAL_ChibiOS/hwdef/Pixracer/hwdef-bl.dat
@@ -0,0 +1,4 @@
+# hw definition file for processing by chibios_hwdef.py for the
+# mRo Pixracer board. This is a fmuv4 board
+
+include ../fmuv4/hwdef-bl.dat
diff --git a/libraries/AP_HAL_ChibiOS/hwdef/Pixracer/hwdef.dat b/libraries/AP_HAL_ChibiOS/hwdef/Pixracer/hwdef.dat
new file mode 100644
index 0000000000..335f0d4544
--- /dev/null
+++ b/libraries/AP_HAL_ChibiOS/hwdef/Pixracer/hwdef.dat
@@ -0,0 +1,4 @@
+# hw definition file for processing by chibios_hwdef.py for the
+# mRo Pixracer board. This is a fmuv4 board
+
+include ../fmuv4/hwdef.dat
diff --git a/libraries/AP_HAL_ChibiOS/hwdef/mRoX21/hwdef-bl.dat b/libraries/AP_HAL_ChibiOS/hwdef/mRoX21/hwdef-bl.dat
new file mode 100644
index 0000000000..a92b3ba316
--- /dev/null
+++ b/libraries/AP_HAL_ChibiOS/hwdef/mRoX21/hwdef-bl.dat
@@ -0,0 +1,4 @@
+# hw definition file for processing by chibios_hwdef.py for the
+# mRo X2.1 board. This is a fmuv3, with BRD_TYPE forced to 20
+
+include ../fmuv3/hwdef-bl.dat
diff --git a/libraries/AP_HAL_ChibiOS/hwdef/mRoX21/hwdef.dat b/libraries/AP_HAL_ChibiOS/hwdef/mRoX21/hwdef.dat
new file mode 100644
index 0000000000..143e6bcb1d
--- /dev/null
+++ b/libraries/AP_HAL_ChibiOS/hwdef/mRoX21/hwdef.dat
@@ -0,0 +1,6 @@
+# hw definition file for processing by chibios_hwdef.py for the
+# mRo X2.1 board. This is a fmuv3, with BRD_TYPE forced to 20
+
+include ../fmuv3/hwdef.dat
+
+define BOARD_TYPE_DEFAULT 20