diff --git a/libraries/AP_HAL_ChibiOS/hwdef/Pixhawk1-1M/hwdef-bl.dat b/libraries/AP_HAL_ChibiOS/hwdef/Pixhawk1-1M/hwdef-bl.dat
new file mode 100644
index 0000000000..a71c921aa7
--- /dev/null
+++ b/libraries/AP_HAL_ChibiOS/hwdef/Pixhawk1-1M/hwdef-bl.dat
@@ -0,0 +1,4 @@
+# hw definition file for processing by chibios_hwdef.py
+# for pixhawk1, based on fmuv3
+
+include ../fmuv3/hwdef-bl.dat
diff --git a/libraries/AP_HAL_ChibiOS/hwdef/Pixhawk1-1M/hwdef.dat b/libraries/AP_HAL_ChibiOS/hwdef/Pixhawk1-1M/hwdef.dat
new file mode 100644
index 0000000000..4b40312f58
--- /dev/null
+++ b/libraries/AP_HAL_ChibiOS/hwdef/Pixhawk1-1M/hwdef.dat
@@ -0,0 +1,7 @@
+# hw definition file for processing by chibios_hwdef.py
+# for Pixhawk1-1M, based on Pixhawk1
+
+include ../Pixhawk1/hwdef.dat
+
+FLASH_SIZE_KB 1024
+define HAL_MINIMIZE_FEATURES 1