diff --git a/ports/atmel-samd/boards/hallowing_m0_express/mpconfigboard.mk b/ports/atmel-samd/boards/hallowing_m0_express/mpconfigboard.mk
index 1c032f02c0..c7c5ae8eba 100644
--- a/ports/atmel-samd/boards/hallowing_m0_express/mpconfigboard.mk
+++ b/ports/atmel-samd/boards/hallowing_m0_express/mpconfigboard.mk
@@ -7,12 +7,13 @@ CHIP_VARIANT = SAMD21G18A
 CHIP_FAMILY = samd21
 
 SPI_FLASH_FILESYSTEM = 1
-EXTERNAL_FLASH_DEVICES = "W25Q64JVxQ, GD25Q64C"
+EXTERNAL_FLASH_DEVICES = "W25Q64JVxQ, GD25Q64C, W25Q16JVxQ"
 LONGINT_IMPL = NONE
 
 # To keep the build small
 CIRCUITPY_AUDIOBUSIO = 0
-CIRCUITPY_BUSDEVICE = 1  # lis3dh needs it
+# lis3dh needs adafruit_bus_device
+CIRCUITPY_BUSDEVICE = 1
 CIRCUITPY_KEYPAD = 0
 
 # Include these Python libraries in firmware.
diff --git a/ports/atmel-samd/boards/seeeduino_xiao_kb/mpconfigboard.mk b/ports/atmel-samd/boards/seeeduino_xiao_kb/mpconfigboard.mk
index d0ff1fa05c..90a83e55eb 100644
--- a/ports/atmel-samd/boards/seeeduino_xiao_kb/mpconfigboard.mk
+++ b/ports/atmel-samd/boards/seeeduino_xiao_kb/mpconfigboard.mk
@@ -15,15 +15,19 @@ CIRCUITPY_FULL_BUILD = 0
 # Many I/O functions are not available or not used in a keyboard
 # CIRCUITPY_ANALOGIO = 1 # Needed for potentiometer input (mouse)
 CIRCUITPY_AUDIOCORE = 0
-CIRCUITPY_BUSIO = 0 # Needed for I2C, SPI and UART - removed that for keyboards...
+# Needed for I2C, SPI and UART - removed that for keyboards...
+CIRCUITPY_BUSIO = 0
 CIRCUITPY_PULSEIO = 0
-# CIRCUITPY_PWMIO = 1 # only needed for speaker or LED PWM functions. Takes 2314 bytes.
+# only needed for speaker or LED PWM functions. Takes 2314 bytes.
+# CIRCUITPY_PWMIO = 1
 CIRCUITPY_RTC = 0
 CIRCUITPY_MATH = 0
 #CIRCUITPY_RANDOM = 0
 CIRCUITPY_ONEWIREIO = 0
-CIRCUITPY_NEOPIXEL_WRITE = 1 # Needed for RGB LEDs
-CIRCUITPY_RAINBOWIO = 1  # Needed for RGB LEDs
+# Needed for RGB LEDs
+CIRCUITPY_NEOPIXEL_WRITE = 1
+# Needed for RGB LEDs
+CIRCUITPY_RAINBOWIO = 1
 # These are used in a keyboard or computer input device.
 CIRCUITPY_ROTARYIO = 1
 CIRCUITPY_KEYPAD = 1
diff --git a/ports/stm/boards/stm32f411ce_blackpill/mpconfigboard.mk b/ports/stm/boards/stm32f411ce_blackpill/mpconfigboard.mk
index db83a5ce6b..74b02d7c43 100644
--- a/ports/stm/boards/stm32f411ce_blackpill/mpconfigboard.mk
+++ b/ports/stm/boards/stm32f411ce_blackpill/mpconfigboard.mk
@@ -4,7 +4,10 @@ USB_PRODUCT = "stm32f411ce blackpill"
 USB_MANUFACTURER = "WeAct"
 
 # SPI_FLASH_FILESYSTEM = 1
-# EXTERNAL_FLASH_DEVICES = xxxxxx #See supervisor/shared/external_flash/devices.h for options
+
+# See supervisor/shared/external_flash/devices.h for options
+# EXTERNAL_FLASH_DEVICES = xxxxxx
+
 # LONGINT_IMPL = MPZ
 
 INTERNAL_FLASH_FILESYSTEM = 1