diff --git a/main.c b/main.c
index 0521170545..810348b6c9 100644
--- a/main.c
+++ b/main.c
@@ -62,6 +62,7 @@
 #include "supervisor/shared/workflow.h"
 #include "supervisor/usb.h"
 #include "supervisor/workflow.h"
+#include "supervisor/shared/external_flash/external_flash.h"
 
 #include "shared-bindings/microcontroller/__init__.h"
 #include "shared-bindings/microcontroller/Processor.h"
@@ -982,6 +983,3 @@ void MP_WEAK __assert_func(const char *file, int line, const char *func, const c
     __fatal_error("Assertion failed");
 }
 #endif
-
-void MP_WEAK external_flash_setup(void) {
-}
diff --git a/ports/atmel-samd/boards/sparkfun_samd51_micromod/board.c b/ports/atmel-samd/boards/sparkfun_samd51_micromod/board.c
index 5960bff666..9e862b3c01 100644
--- a/ports/atmel-samd/boards/sparkfun_samd51_micromod/board.c
+++ b/ports/atmel-samd/boards/sparkfun_samd51_micromod/board.c
@@ -28,7 +28,7 @@
 #include "mpconfigboard.h"
 #include "common-hal/microcontroller/Pin.h"
 #include "hal/include/hal_gpio.h"
-#include "py/mphal.h"
+#include "supervisor/shared/external_flash/external_flash.h"
 
 void board_init(void) {
 }
@@ -58,7 +58,4 @@ void external_flash_setup(void) {
     gpio_set_pin_function(PIN_PB23, GPIO_PIN_FUNCTION_OFF);
     gpio_set_pin_direction(PIN_PB23, GPIO_DIRECTION_OUT);
     gpio_set_pin_level(PIN_PB23, true);
-
-    // Add some delay to give the pins time to get set
-    // mp_hal_delay_ms(3000);
 }
diff --git a/supervisor/board.h b/supervisor/board.h
index d9aee837f7..e3f0af79a3 100644
--- a/supervisor/board.h
+++ b/supervisor/board.h
@@ -47,9 +47,4 @@ void reset_board(void);
 // disabling USB, BLE or flash) because CircuitPython may continue to run.
 void board_deinit(void);
 
-// Configure anything that needs to get set up before the external flash
-// is init'ed. For example, if GPIO needs to be configured to enable the
-// flash chip, as is the case on some boards.
-void external_flash_setup(void);
-
 #endif  // MICROPY_INCLUDED_SUPERVISOR_BOARD_H
diff --git a/supervisor/shared/external_flash/external_flash.c b/supervisor/shared/external_flash/external_flash.c
index 33d618276c..7da45fdc99 100644
--- a/supervisor/shared/external_flash/external_flash.c
+++ b/supervisor/shared/external_flash/external_flash.c
@@ -588,3 +588,6 @@ mp_uint_t supervisor_flash_write_blocks(const uint8_t *src, uint32_t block_num,
     }
     return 0; // success
 }
+
+void MP_WEAK external_flash_setup(void) {
+}
diff --git a/supervisor/shared/external_flash/external_flash.h b/supervisor/shared/external_flash/external_flash.h
index db5c677eb0..7966b64674 100644
--- a/supervisor/shared/external_flash/external_flash.h
+++ b/supervisor/shared/external_flash/external_flash.h
@@ -47,4 +47,9 @@
 
 void supervisor_external_flash_flush(void);
 
+// Configure anything that needs to get set up before the external flash
+// is init'ed. For example, if GPIO needs to be configured to enable the
+// flash chip, as is the case on some boards.
+void external_flash_setup(void);
+
 #endif  // MICROPY_INCLUDED_SUPERVISOR_SHARED_EXTERNAL_FLASH_EXTERNAL_FLASH_H