diff --git a/ports/stm32f4/boards/STM32F411VETx_FLASH.ld b/ports/stm32f4/boards/STM32F411VETx_FLASH.ld
index fc9ffdff56..ac1ba32408 100644
--- a/ports/stm32f4/boards/STM32F411VETx_FLASH.ld
+++ b/ports/stm32f4/boards/STM32F411VETx_FLASH.ld
@@ -7,8 +7,8 @@ MEMORY
 {
     FLASH (rx)      : ORIGIN = 0x08000000, LENGTH = 512K /* entire flash */
     FLASH_ISR (rx)  : ORIGIN = 0x08000000, LENGTH = 16K /* sector 0 */
-    FLASH_FS (rx)   : ORIGIN = 0x08004000, LENGTH = 112K /* sectors 1,2,3 are 16K, 4 is 64K */
-    FLASH_TEXT (rx) : ORIGIN = 0x08020000, LENGTH = 384K /* sectors 5,6,7 are 128K */
+    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 = 128K
 }
 
diff --git a/ports/stm32f4/boards/stm32f411.ld b/ports/stm32f4/boards/stm32f411.ld
deleted file mode 100644
index f0d4804f93..0000000000
--- a/ports/stm32f4/boards/stm32f411.ld
+++ /dev/null
@@ -1,189 +0,0 @@
-/*
-******************************************************************************
-**
-
-**  File        : LinkerScript.ld
-**
-**  Author		: Auto-generated by Ac6 System Workbench
-**
-**  Abstract    : Linker script for STM32F411RETx series
-**                512Kbytes FLASH and 128Kbytes RAM
-**
-**                Set heap size, stack size and stack location according
-**                to application requirements.
-**
-**                Set memory bank area and size if external memory is used.
-**
-**  Target      : STMicroelectronics STM32
-**
-**  Distribution: The file is distributed “as is,” without any warranty
-**                of any kind.
-**
-*****************************************************************************
-** @attention
-**
-** <h2><center>&copy; COPYRIGHT(c) 2014 Ac6</center></h2>
-**
-** Redistribution and use in source and binary forms, with or without modification,
-** are permitted provided that the following conditions are met:
-**   1. Redistributions of source code must retain the above copyright notice,
-**      this list of conditions and the following disclaimer.
-**   2. Redistributions in binary form must reproduce the above copyright notice,
-**      this list of conditions and the following disclaimer in the documentation
-**      and/or other materials provided with the distribution.
-**   3. Neither the name of Ac6 nor the names of its contributors
-**      may be used to endorse or promote products derived from this software
-**      without specific prior written permission.
-**
-** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
-** AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
-** IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
-** DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
-** FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
-** DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
-** SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
-** CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
-** OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-**
-*****************************************************************************
-*/
-
-/* Entry Point */
-ENTRY(Reset_Handler)
-
-/* Highest address of the user mode stack */
-_estack = 0x20020000;    /* end of RAM */
-/* Generate a link error if heap and stack don't fit into RAM */
-_Min_Heap_Size = 0x200;      /* required amount of heap  */
-_Min_Stack_Size = 0x400; /* required amount of stack */
-
-/* Specify the memory areas */
-MEMORY
-{
-RAM (xrw)      : ORIGIN = 0x20000000, LENGTH = 128K
-FLASH (rx)      : ORIGIN = 0x8000000, LENGTH = 512K
-}
-
-/* Define output sections */
-SECTIONS
-{
-  /* The startup code goes first into FLASH */
-  .isr_vector :
-  {
-    . = ALIGN(4);
-    KEEP(*(.isr_vector)) /* Startup code */
-    . = ALIGN(4);
-  } >FLASH
-
-  /* The program code and other data goes into FLASH */
-  .text :
-  {
-    . = ALIGN(4);
-    *(.text)           /* .text sections (code) */
-    *(.text*)          /* .text* sections (code) */
-    *(.glue_7)         /* glue arm to thumb code */
-    *(.glue_7t)        /* glue thumb to arm code */
-    *(.eh_frame)
-
-    KEEP (*(.init))
-    KEEP (*(.fini))
-
-    . = ALIGN(4);
-    _etext = .;        /* define a global symbols at end of code */
-  } >FLASH
-
-  /* Constant data goes into FLASH */
-  .rodata :
-  {
-    . = ALIGN(4);
-    *(.rodata)         /* .rodata sections (constants, strings, etc.) */
-    *(.rodata*)        /* .rodata* sections (constants, strings, etc.) */
-    . = ALIGN(4);
-  } >FLASH
-
-  .ARM.extab   : { *(.ARM.extab* .gnu.linkonce.armextab.*) } >FLASH
-  .ARM : {
-    __exidx_start = .;
-    *(.ARM.exidx*)
-    __exidx_end = .;
-  } >FLASH
-
-  .preinit_array     :
-  {
-    PROVIDE_HIDDEN (__preinit_array_start = .);
-    KEEP (*(.preinit_array*))
-    PROVIDE_HIDDEN (__preinit_array_end = .);
-  } >FLASH
-  .init_array :
-  {
-    PROVIDE_HIDDEN (__init_array_start = .);
-    KEEP (*(SORT(.init_array.*)))
-    KEEP (*(.init_array*))
-    PROVIDE_HIDDEN (__init_array_end = .);
-  } >FLASH
-  .fini_array :
-  {
-    PROVIDE_HIDDEN (__fini_array_start = .);
-    KEEP (*(SORT(.fini_array.*)))
-    KEEP (*(.fini_array*))
-    PROVIDE_HIDDEN (__fini_array_end = .);
-  } >FLASH
-
-  /* used by the startup to initialize data */
-  _sidata = LOADADDR(.data);
-
-  /* Initialized data sections goes into RAM, load LMA copy after code */
-  .data : 
-  {
-    . = ALIGN(4);
-    _sdata = .;        /* create a global symbol at data start */
-    *(.data)           /* .data sections */
-    *(.data*)          /* .data* sections */
-
-    . = ALIGN(4);
-    _edata = .;        /* define a global symbol at data end */
-  } >RAM AT> FLASH
-
-  
-  /* Uninitialized data section */
-  . = ALIGN(4);
-  .bss :
-  {
-    /* This is used by the startup in order to initialize the .bss secion */
-    _sbss = .;         /* define a global symbol at bss start */
-    __bss_start__ = _sbss;
-    *(.bss)
-    *(.bss*)
-    *(COMMON)
-
-    . = ALIGN(4);
-    _ebss = .;         /* define a global symbol at bss end */
-    __bss_end__ = _ebss;
-  } >RAM
-
-  /* User_heap_stack section, used to check that there is enough RAM left */
-  ._user_heap_stack :
-  {
-    . = ALIGN(8);
-    PROVIDE ( end = . );
-    PROVIDE ( _end = . );
-    . = . + _Min_Heap_Size;
-    . = . + _Min_Stack_Size;
-    . = ALIGN(8);
-  } >RAM
-
-  
-
-  /* Remove information from the standard libraries */
-  /DISCARD/ :
-  {
-    libc.a ( * )
-    libm.a ( * )
-    libgcc.a ( * )
-  }
-
-  .ARM.attributes 0 : { *(.ARM.attributes) }
-}
-
-
diff --git a/ports/stm32f4/boards/stm32f411ve_discovery/mpconfigboard.h b/ports/stm32f4/boards/stm32f411ve_discovery/mpconfigboard.h
index 979b75b4c7..21466f4df9 100644
--- a/ports/stm32f4/boards/stm32f411ve_discovery/mpconfigboard.h
+++ b/ports/stm32f4/boards/stm32f411ve_discovery/mpconfigboard.h
@@ -37,6 +37,6 @@
 
 #define CIRCUITPY_INTERNAL_NVM_SIZE 256
 
-#define BOARD_FLASH_SIZE (FLASH_SIZE - 0x2000 - 0x01C000 - CIRCUITPY_INTERNAL_NVM_SIZE)
+#define BOARD_FLASH_SIZE (FLASH_SIZE - 0x2000 - 0xC000 - CIRCUITPY_INTERNAL_NVM_SIZE)
 
 #define AUTORESET_DELAY_MS 500
\ No newline at end of file
diff --git a/ports/stm32f4/boards/stm32f412zg_discovery/mpconfigboard.mk b/ports/stm32f4/boards/stm32f412zg_discovery/mpconfigboard.mk
index b6c27f9c04..3b3c7867fe 100644
--- a/ports/stm32f4/boards/stm32f412zg_discovery/mpconfigboard.mk
+++ b/ports/stm32f4/boards/stm32f412zg_discovery/mpconfigboard.mk
@@ -3,6 +3,8 @@ USB_PID = 0x572B
 USB_PRODUCT = "STM32F412ZG Discovery Board - CPy"
 USB_MANUFACTURER = "STMicroelectronics"
 
+DISABLE_FILESYSTEM = 1
+
 MCU_SERIES = m4
 MCU_VARIANT = stm32f4
 MCU_SUB_VARIANT = stm32f412zx
diff --git a/ports/stm32f4/common-hal/busio/SPI.c b/ports/stm32f4/common-hal/busio/SPI.c
index dfb436fb93..98faf7b3b8 100644
--- a/ports/stm32f4/common-hal/busio/SPI.c
+++ b/ports/stm32f4/common-hal/busio/SPI.c
@@ -87,3 +87,4 @@ uint8_t common_hal_busio_spi_get_phase(busio_spi_obj_t* self) {
 
 uint8_t common_hal_busio_spi_get_polarity(busio_spi_obj_t* self) {
     return 0;
+}
\ No newline at end of file
diff --git a/ports/stm32f4/supervisor/internal_flash.h b/ports/stm32f4/supervisor/internal_flash.h
index c8a60cc557..83b35e03cb 100644
--- a/ports/stm32f4/supervisor/internal_flash.h
+++ b/ports/stm32f4/supervisor/internal_flash.h
@@ -33,18 +33,17 @@
 
 #ifdef STM32F411xE
 #define STM32_FLASH_SIZE 0x80000 //512KiB
-#define INTERNAL_FLASH_FILESYSTEM_SIZE 0x1C000 //112KiB
+#define INTERNAL_FLASH_FILESYSTEM_SIZE 0xC000 //112KiB
 #endif
 
 #ifdef STM32F412Zx
 #define STM32_FLASH_SIZE 0x100000 //1MB
-#define INTERNAL_FLASH_FILESYSTEM_SIZE 0x1C000 //112KiB
+#define INTERNAL_FLASH_FILESYSTEM_SIZE 0xC000 //112KiB
 #endif
 
 #define STM32_FLASH_OFFSET 0x8000000 //All STM32 chips map to this flash location
 
 #define INTERNAL_FLASH_FILESYSTEM_START_ADDR 0x08004000
-//#define INTERNAL_FLASH_FILESYSTEM_START_ADDR ((STM32_FLASH_SIZE + STM32_FLASH_OFFSET) - INTERNAL_FLASH_FILESYSTEM_SIZE - CIRCUITPY_INTERNAL_NVM_SIZE)
 #define INTERNAL_FLASH_FILESYSTEM_NUM_BLOCKS (INTERNAL_FLASH_FILESYSTEM_SIZE / FILESYSTEM_BLOCK_SIZE)
 
 #define INTERNAL_FLASH_SYSTICK_MASK     (0x1ff) // 512ms
diff --git a/supervisor/stub/internal_flash.c b/supervisor/stub/internal_flash.c
new file mode 100644
index 0000000000..334281e77f
--- /dev/null
+++ b/supervisor/stub/internal_flash.c
@@ -0,0 +1,70 @@
+/*f
+ * This file is part of the MicroPython project, http://micropython.org/
+ *
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2013, 2014 Damien P. George
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+#include "supervisor/internal_flash.h"
+
+#include <stdint.h>
+#include <string.h>
+
+#include "extmod/vfs.h"
+#include "extmod/vfs_fat.h"
+#include "py/mphal.h"
+#include "py/obj.h"
+#include "py/runtime.h"
+#include "lib/oofatfs/ff.h"
+
+void supervisor_flash_init(void) {
+}
+
+uint32_t supervisor_flash_get_block_size(void) {
+    return 0;
+}
+
+uint32_t supervisor_flash_get_block_count(void) {
+    return 0;
+}
+
+void supervisor_flash_flush(void) {
+}
+
+static int32_t convert_block_to_flash_addr(uint32_t block) {
+    return -1;
+}
+
+mp_uint_t supervisor_flash_read_blocks(uint8_t *dest, uint32_t block, uint32_t num_blocks) {
+    return 0; // success
+}
+
+bool supervisor_flash_write_block(const uint8_t *src, uint32_t block) {
+    return true;
+}
+
+mp_uint_t supervisor_flash_write_blocks(const uint8_t *src, uint32_t block_num, uint32_t num_blocks) {
+    return 0; // success
+}
+
+void supervisor_flash_release_cache(void) {
+}
+
diff --git a/supervisor/supervisor.mk b/supervisor/supervisor.mk
index 1022dd2a34..4870f15d83 100644
--- a/supervisor/supervisor.mk
+++ b/supervisor/supervisor.mk
@@ -13,7 +13,7 @@ SRC_SUPERVISOR = \
 	supervisor/shared/translate.c
 
 ifndef $(NO_USB)
-NO_USB = $(wildcard supervisor/usb.c)
+	NO_USB = $(wildcard supervisor/usb.c)
 endif
 
 ifneq ($(INTERNAL_FLASH_FILESYSTEM),)
@@ -44,7 +44,11 @@ ifdef EXTERNAL_FLASH_DEVICES
 		SRC_SUPERVISOR += supervisor/qspi_flash.c supervisor/shared/external_flash/qspi_flash.c
 	endif
 else
-	SRC_SUPERVISOR += supervisor/internal_flash.c
+	ifneq ($(DISABLE_FILESYSTEM),1)
+		SRC_SUPERVISOR += supervisor/internal_flash.c
+	else 
+		SRC_SUPERVISOR += supervisor/stub/internal_flash.c
+	endif
 endif
 
 ifeq ($(USB),FALSE)