diff --git a/libraries/AP_HAL_ChibiOS/hwdef/MatekF405-TE/hwdef-bl.dat b/libraries/AP_HAL_ChibiOS/hwdef/MatekF405-TE/hwdef-bl.dat
index d6398e7f00..87a6bc1458 100644
--- a/libraries/AP_HAL_ChibiOS/hwdef/MatekF405-TE/hwdef-bl.dat
+++ b/libraries/AP_HAL_ChibiOS/hwdef/MatekF405-TE/hwdef-bl.dat
@@ -33,3 +33,6 @@ PB12 OSD_CS CS
 PC13 FLASH_CS CS
 PC1  SDCARD_CS CS
 
+# Turn on switched supply and camera switch/output during bootloader to match default
+PA4  PINIO1 OUTPUT LOW
+PB5  PINIO2 OUTPUT LOW
diff --git a/libraries/AP_HAL_ChibiOS/hwdef/MatekF765-Wing/hwdef-bl.dat b/libraries/AP_HAL_ChibiOS/hwdef/MatekF765-Wing/hwdef-bl.dat
index d3862451d5..f2799e4460 100644
--- a/libraries/AP_HAL_ChibiOS/hwdef/MatekF765-Wing/hwdef-bl.dat
+++ b/libraries/AP_HAL_ChibiOS/hwdef/MatekF765-Wing/hwdef-bl.dat
@@ -41,3 +41,6 @@ PC4 IMU1_CS CS
 PB12 MAX7456_CS CS
 PD7 IMU2_CS CS
 PE11 SPARE_CS CS
+
+# turn switched supply on at power up
+PE4  PINIO1 OUTPUT LOW
diff --git a/libraries/AP_HAL_ChibiOS/hwdef/MatekH743/hwdef-bl.dat b/libraries/AP_HAL_ChibiOS/hwdef/MatekH743/hwdef-bl.dat
index 72e272971d..1bf46917e9 100644
--- a/libraries/AP_HAL_ChibiOS/hwdef/MatekH743/hwdef-bl.dat
+++ b/libraries/AP_HAL_ChibiOS/hwdef/MatekH743/hwdef-bl.dat
@@ -38,6 +38,9 @@ PA12 OTG_FS_DP OTG1
 PA13 JTMS-SWDIO SWD
 PA14 JTCK-SWCLK SWD
 
+# make sure Vsw is on during bootloader
+PD10  PINIO1 OUTPUT LOW
+
 PE3 LED_BOOTLOADER OUTPUT LOW
 define HAL_LED_ON 0