diff --git a/ports/samd/boards/ADAFRUIT_FEATHER_M0_EXPRESS/mpconfigboard.mk b/ports/samd/boards/ADAFRUIT_FEATHER_M0_EXPRESS/mpconfigboard.mk
index a760cf047e..aa3fbd35da 100644
--- a/ports/samd/boards/ADAFRUIT_FEATHER_M0_EXPRESS/mpconfigboard.mk
+++ b/ports/samd/boards/ADAFRUIT_FEATHER_M0_EXPRESS/mpconfigboard.mk
@@ -6,3 +6,4 @@ TEXT0 = 0x2000
 # The ?='s allow overriding in mpconfigboard.mk.
 # MicroPython settings
 MICROPY_VFS_LFS1 ?= 1
+MICROPY_HW_CODESIZE ?= 248K
diff --git a/ports/samd/boards/ADAFRUIT_FEATHER_M4_EXPRESS/mpconfigboard.mk b/ports/samd/boards/ADAFRUIT_FEATHER_M4_EXPRESS/mpconfigboard.mk
index 781faa2410..70d73ee6fa 100644
--- a/ports/samd/boards/ADAFRUIT_FEATHER_M4_EXPRESS/mpconfigboard.mk
+++ b/ports/samd/boards/ADAFRUIT_FEATHER_M4_EXPRESS/mpconfigboard.mk
@@ -6,3 +6,4 @@ TEXT0 = 0x4000
 # The ?='s allow overriding in mpconfigboard.mk.
 # MicroPython settings
 MICROPY_VFS_LFS1 ?= 1
+MICROPY_HW_CODESIZE ?= 496K
diff --git a/ports/samd/boards/ADAFRUIT_ITSYBITSY_M0_EXPRESS/mpconfigboard.mk b/ports/samd/boards/ADAFRUIT_ITSYBITSY_M0_EXPRESS/mpconfigboard.mk
index a760cf047e..aa3fbd35da 100644
--- a/ports/samd/boards/ADAFRUIT_ITSYBITSY_M0_EXPRESS/mpconfigboard.mk
+++ b/ports/samd/boards/ADAFRUIT_ITSYBITSY_M0_EXPRESS/mpconfigboard.mk
@@ -6,3 +6,4 @@ TEXT0 = 0x2000
 # The ?='s allow overriding in mpconfigboard.mk.
 # MicroPython settings
 MICROPY_VFS_LFS1 ?= 1
+MICROPY_HW_CODESIZE ?= 248K
diff --git a/ports/samd/boards/ADAFRUIT_ITSYBITSY_M4_EXPRESS/mpconfigboard.mk b/ports/samd/boards/ADAFRUIT_ITSYBITSY_M4_EXPRESS/mpconfigboard.mk
index da3e47589a..7ef411431d 100644
--- a/ports/samd/boards/ADAFRUIT_ITSYBITSY_M4_EXPRESS/mpconfigboard.mk
+++ b/ports/samd/boards/ADAFRUIT_ITSYBITSY_M4_EXPRESS/mpconfigboard.mk
@@ -6,3 +6,4 @@ TEXT0 = 0x4000
 # The ?='s allow overriding in mpconfigboard.mk.
 # MicroPython settings
 MICROPY_VFS_LFS1 ?= 1
+MICROPY_HW_CODESIZE ?= 496K
diff --git a/ports/samd/boards/ADAFRUIT_METRO_M4_EXPRESS/mpconfigboard.mk b/ports/samd/boards/ADAFRUIT_METRO_M4_EXPRESS/mpconfigboard.mk
index 238ca0055d..a196612539 100644
--- a/ports/samd/boards/ADAFRUIT_METRO_M4_EXPRESS/mpconfigboard.mk
+++ b/ports/samd/boards/ADAFRUIT_METRO_M4_EXPRESS/mpconfigboard.mk
@@ -10,3 +10,4 @@ MICROPY_PY_NETWORK ?= 1
 MICROPY_PY_NETWORK_NINAW10 ?= 1
 
 BOARD_VARIANTS += "wlan"
+MICROPY_HW_CODESIZE ?= 496K
diff --git a/ports/samd/boards/MINISAM_M4/mpconfigboard.mk b/ports/samd/boards/MINISAM_M4/mpconfigboard.mk
index 73afb02104..4ccbf92c7e 100644
--- a/ports/samd/boards/MINISAM_M4/mpconfigboard.mk
+++ b/ports/samd/boards/MINISAM_M4/mpconfigboard.mk
@@ -7,3 +7,4 @@ TEXT0 = 0x4000
 # The ?='s allow overriding in mpconfigboard.mk.
 # MicroPython settings
 MICROPY_VFS_LFS1 ?= 1
+MICROPY_HW_CODESIZE ?= 496K
diff --git a/ports/samd/boards/SEEED_WIO_TERMINAL/mpconfigboard.mk b/ports/samd/boards/SEEED_WIO_TERMINAL/mpconfigboard.mk
index c2c4da6152..03f97e138c 100644
--- a/ports/samd/boards/SEEED_WIO_TERMINAL/mpconfigboard.mk
+++ b/ports/samd/boards/SEEED_WIO_TERMINAL/mpconfigboard.mk
@@ -6,3 +6,4 @@ TEXT0 = 0x4000
 # The ?='s allow overriding in mpconfigboard.mk.
 # MicroPython settings
 MICROPY_VFS_LFS1 ?= 1
+MICROPY_HW_CODESIZE ?= 496K
diff --git a/ports/samd/boards/SPARKFUN_SAMD51_THING_PLUS/mpconfigboard.mk b/ports/samd/boards/SPARKFUN_SAMD51_THING_PLUS/mpconfigboard.mk
index 9e5cf887df..65b1ba7a33 100644
--- a/ports/samd/boards/SPARKFUN_SAMD51_THING_PLUS/mpconfigboard.mk
+++ b/ports/samd/boards/SPARKFUN_SAMD51_THING_PLUS/mpconfigboard.mk
@@ -6,3 +6,4 @@ TEXT0 = 0x4000
 # The ?='s allow overriding in mpconfigboard.mk.
 # MicroPython settings
 MICROPY_VFS_LFS1 ?= 1
+MICROPY_HW_CODESIZE ?= 1008K