diff --git a/ports/stm32f4/boards/STM32F401_fs.ld b/ports/stm32f4/boards/STM32F401_fs.ld
new file mode 100644
index 0000000000..fd30e16228
--- /dev/null
+++ b/ports/stm32f4/boards/STM32F401_fs.ld
@@ -0,0 +1,107 @@
+/*
+    GNU linker script for STM32F401 with bootloader (such as the Meowbit)
+*/
+
+/* Specify the memory areas */
+MEMORY
+{
+    FLASH (rx)      : ORIGIN = 0x08000000, LENGTH = 512K /* entire flash */
+    FLASH_ISR (rx)  : ORIGIN = 0x08000000, LENGTH = 16K /* sector 0 */
+    FLASH_FS (rx)   : ORIGIN = 0x08004000, LENGTH = 48K /* sectors 1,2,3 are 16K */
+    FLASH_TEXT (rx) : ORIGIN = 0x08010000, LENGTH = 448K /* sector 4 is 64K, sectors 5,6,7 are 128K */
+    RAM (xrw)       : ORIGIN = 0x20000000, LENGTH = 96K
+}
+
+/* produce a link error if there is not this amount of RAM for these sections */
+_minimum_stack_size = 2K;
+_minimum_heap_size = 16K;
+
+/* Define tho top end of the stack.  The stack is full descending so begins just
+   above last byte of RAM.  Note that EABI requires the stack to be 8-byte
+   aligned for a call. */
+_estack = ORIGIN(RAM) + LENGTH(RAM);
+
+/* RAM extents for the garbage collector */
+_ram_start = ORIGIN(RAM);
+_ram_end = ORIGIN(RAM) + LENGTH(RAM);
+
+ENTRY(Reset_Handler)
+
+/* define output sections */
+SECTIONS
+{
+    /* The startup code goes first into FLASH */
+    .isr_vector :
+    {
+        . = ALIGN(4);
+        KEEP(*(.isr_vector)) /* Startup code */
+
+        /* This first flash block is 16K annd the isr vectors only take up
+           about 400 bytes. Micropython pads this with files, but this didn't
+           work with the size of Circuitpython's ff object. */
+
+        . = ALIGN(4);
+    } >FLASH_ISR
+
+    /* The program code and other data goes into FLASH */
+    .text :
+    {
+        . = ALIGN(4);
+        *(.text*)          /* .text* sections (code) */
+        *(.rodata*)        /* .rodata* sections (constants, strings, etc.) */
+    /*  *(.glue_7)   */    /* glue arm to thumb code */
+    /*  *(.glue_7t)  */    /* glue thumb to arm code */
+
+        . = ALIGN(4);
+        _etext = .;        /* define a global symbol at end of code */
+    } >FLASH_TEXT
+
+    /* used by the startup to initialize data */
+    _sidata = LOADADDR(.data);
+
+    /* This is the initialized data section
+    The program executes knowing that the data is in the RAM
+    but the loader puts the initial values in the FLASH (inidata).
+    It is one task of the startup to copy the initial values from FLASH to RAM. */
+    .data :
+    {
+        . = ALIGN(4);
+        _sdata = .;        /* create a global symbol at data start; used by startup code in order to initialise the .data section in RAM */
+        *(.data*)          /* .data* sections */
+
+        . = ALIGN(4);
+        _edata = .;        /* define a global symbol at data end; used by startup code in order to initialise the .data section in RAM */
+    } >RAM AT> FLASH_TEXT
+
+    /* Uninitialized data section */
+    .bss :
+    {
+        . = ALIGN(4);
+        _sbss = .;         /* define a global symbol at bss start; used by startup code */
+        *(.bss*)
+        *(COMMON)
+
+        . = ALIGN(4);
+        _ebss = .;         /* define a global symbol at bss end; used by startup code and GC */
+    } >RAM
+
+    /* this is to define the start of the heap, and make sure we have a minimum size */
+    .heap :
+    {
+        . = ALIGN(4);
+        . = . + _minimum_heap_size;
+        . = ALIGN(4);
+    } >RAM
+
+    /* this just checks there is enough RAM for the stack */
+    .stack :
+    {
+        . = ALIGN(4);
+        . = . + _minimum_stack_size;
+        . = ALIGN(4);
+    } >RAM
+
+    .ARM.attributes 0 : { *(.ARM.attributes) }
+}
+
+
diff --git a/ports/stm32f4/boards/meowbit_v121/mpconfigboard.h b/ports/stm32f4/boards/meowbit_v121/mpconfigboard.h
index eb526d0a75..89cdee6d95 100644
--- a/ports/stm32f4/boards/meowbit_v121/mpconfigboard.h
+++ b/ports/stm32f4/boards/meowbit_v121/mpconfigboard.h
@@ -39,7 +39,7 @@
 #define BOARD_NO_VBUS
 
 // On-board flash
-#define SPI_FLASH_MOSI_PIN          (&pin_PB15)
-#define SPI_FLASH_MISO_PIN          (&pin_PB14)
-#define SPI_FLASH_SCK_PIN           (&pin_PB13)
-#define SPI_FLASH_CS_PIN            (&pin_PB01)
+// #define SPI_FLASH_MOSI_PIN          (&pin_PB15)
+// #define SPI_FLASH_MISO_PIN          (&pin_PB14)
+// #define SPI_FLASH_SCK_PIN           (&pin_PB13)
+// #define SPI_FLASH_CS_PIN            (&pin_PB01)
diff --git a/ports/stm32f4/boards/meowbit_v121/mpconfigboard.mk b/ports/stm32f4/boards/meowbit_v121/mpconfigboard.mk
index 8b605975d5..1642120e80 100644
--- a/ports/stm32f4/boards/meowbit_v121/mpconfigboard.mk
+++ b/ports/stm32f4/boards/meowbit_v121/mpconfigboard.mk
@@ -4,16 +4,19 @@ USB_PRODUCT = "Meowbit"
 USB_MANUFACTURER = "Kittenbot"
 USB_DEVICES = "CDC,MSC"
 
-SPI_FLASH_FILESYSTEM = 1
-EXTERNAL_FLASH_DEVICE_COUNT = 1
-EXTERNAL_FLASH_DEVICES = W25Q16JV_IQ
-LONGINT_IMPL = MPZ
+# SPI_FLASH_FILESYSTEM = 1
+# EXTERNAL_FLASH_DEVICE_COUNT = 1
+# EXTERNAL_FLASH_DEVICES = W25Q16JV_IQ
+# LONGINT_IMPL = MPZ
+
+INTERNAL_FLASH_FILESYSTEM = 1
+LONGINT_IMPL = NONE
 
 MCU_SERIES = m4
 MCU_VARIANT = stm32f4
 MCU_SUB_VARIANT = stm32f401xe
 MCU_PACKAGE = 64
 CMSIS_MCU = STM32F401xE
-LD_FILE = boards/STM32F401.ld
+LD_FILE = boards/STM32F401_fs.ld
 TEXT0_ADDR = 0x08010000
 TEXT1_ADDR = 0x08020000
\ No newline at end of file
diff --git a/ports/stm32f4/supervisor/internal_flash.h b/ports/stm32f4/supervisor/internal_flash.h
index b6d26a07fe..8991fb8aa0 100644
--- a/ports/stm32f4/supervisor/internal_flash.h
+++ b/ports/stm32f4/supervisor/internal_flash.h
@@ -32,6 +32,11 @@
 
 #include "py/mpconfig.h"
 
+#ifdef STM32F401xE
+#define STM32_FLASH_SIZE 0x80000 //512KiB
+#define INTERNAL_FLASH_FILESYSTEM_SIZE 0xC000 //48KiB
+#endif
+
 #ifdef STM32F411xE
 #define STM32_FLASH_SIZE 0x80000 //512KiB
 #define INTERNAL_FLASH_FILESYSTEM_SIZE 0xC000 //48KiB