diff --git a/libraries/AP_HAL_ChibiOS/hwdef/fmuv3/hwdef-bl.dat b/libraries/AP_HAL_ChibiOS/hwdef/fmuv3/hwdef-bl.dat
new file mode 100644
index 0000000000..f4ac965f36
--- /dev/null
+++ b/libraries/AP_HAL_ChibiOS/hwdef/fmuv3/hwdef-bl.dat
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+# hw definition file for processing by chibios_hwdef.py
+# for bootloader for FMUv3 hardware (ie. for Pixhawk1, Pixhawk2 cube, XUAV2.1 etc)
+
+# MCU class and specific type
+MCU STM32F4xx STM32F427xx
+
+# board ID for firmware load
+APJ_BOARD_ID 9
+
+# crystal frequency
+OSCILLATOR_HZ 24000000
+
+# board voltage
+STM32_VDD 330U
+
+# ChibiOS system timer
+STM32_ST_USE_TIMER 5
+
+# flash size
+FLASH_SIZE_KB 2048
+
+# location of application code
+define FLASH_BOOTLOADER_LOAD_KB 16
+
+# bootloader loads at start of flash
+FLASH_RESERVE_START_KB 0
+
+# USB setup
+USB_VENDOR 0x0483 # ST
+USB_PRODUCT 0x5740
+USB_STRING_MANUFACTURER "ArduPilot"
+USB_STRING_PRODUCT "fmuv3-BL"
+USB_STRING_SERIAL  "%SERIAL%"
+
+# baudrate to run bootloader at on uarts
+define BOOTLOADER_BAUDRATE 115200
+
+# uarts and USB to run bootloader protocol on
+UART_ORDER OTG1 USART2 UART7
+
+# UART4 serial GPS
+PA0 UART4_TX UART4
+PA1 UART4_RX UART4
+
+# this is the pin that senses USB being connected. It is an input pin
+# setup as OPENDRAIN
+PA9 VBUS INPUT OPENDRAIN
+
+# now we define the pins that USB is connected on
+PA11 OTG_FS_DM OTG1
+PA12 OTG_FS_DP OTG1
+
+# these are the pins for SWD debugging with a STlinkv2 or black-magic probe
+PA13 JTMS-SWDIO SWD
+PA14 JTCK-SWCLK SWD
+
+# Another USART, this one for telem1
+PD5 USART2_TX USART2
+PD6 USART2_RX USART2
+PD3 USART2_CTS USART2
+PD4 USART2_RTS USART2
+
+# the telem2 USART, also with RTS/CTS available
+# USART3 serial3 telem2
+PD8 USART3_TX USART3
+PD9 USART3_RX USART3
+PD11 USART3_CTS USART3
+PD12 USART3_RTS USART3
+
+# now the 2nd GPS UART
+# UART8 serial4 GPS2
+PE0 UART8_RX UART8
+PE1 UART8_TX UART8
+
+# UART7 maps to uartF in the HAL (serial5 in SERIALn_ parameters)
+PE7 UART7_RX UART7
+PE8 UART7_TX UART7
+
+# define a LED, mapping it to GPIO(0)
+PE12 LED_BOOTLOADER OUTPUT GPIO(0)
+define HAL_LED_ON 1
+
+# this adds a C define which sets up the ArduPilot architecture
+# define. Any line starting with 'define' is copied literally as
+# a #define in the hwdef.h header
+define HAL_CHIBIOS_ARCH_FMUV3 1
+
+# we need to tell HAL_ChibiOS/Storage.cpp how much storage is
+# available (in bytes)
+define HAL_STORAGE_SIZE 16384
+
+# uncomment the lines below to enable strict API
+# checking in ChibiOS
+# define CH_DBG_ENABLE_ASSERTS TRUE
+# define CH_DBG_ENABLE_CHECKS TRUE
+# define CH_DBG_SYSTEM_STATE_CHECK TRUE
+# define CH_DBG_ENABLE_STACK_CHECK TRUE