diff --git a/esp8266/main.c b/esp8266/main.c
index da37706fcd..0099486750 100644
--- a/esp8266/main.c
+++ b/esp8266/main.c
@@ -49,8 +49,8 @@ STATIC void mp_reset(void) {
     mp_init();
     mp_obj_list_init(mp_sys_path, 0);
     mp_obj_list_append(mp_sys_path, MP_OBJ_NEW_QSTR(MP_QSTR_)); // current dir (or base dir of the script)
-    mp_obj_list_append(mp_sys_path, MP_OBJ_NEW_QSTR(MP_QSTR__slash_lib));
-    mp_obj_list_append(mp_sys_path, MP_OBJ_NEW_QSTR(MP_QSTR__slash_));
+    mp_obj_list_append(mp_sys_path, MP_OBJ_NEW_QSTR(MP_QSTR__slash_flash_slash_lib));
+    mp_obj_list_append(mp_sys_path, MP_OBJ_NEW_QSTR(MP_QSTR__slash_flash));
     mp_obj_list_init(mp_sys_argv, 0);
     MP_STATE_PORT(term_obj) = MP_OBJ_NULL;
     MP_STATE_PORT(dupterm_arr_obj) = MP_OBJ_NULL;
@@ -109,34 +109,23 @@ void user_init(void) {
     system_init_done_cb(init_done);
 }
 
-mp_import_stat_t fat_vfs_import_stat(const char *path);
-
-#if !MICROPY_VFS_FAT
+#if !MICROPY_VFS
 mp_lexer_t *mp_lexer_new_from_file(const char *filename) {
     return NULL;
 }
-#endif
 
 mp_import_stat_t mp_import_stat(const char *path) {
-    #if MICROPY_VFS_FAT
-    return fat_vfs_import_stat(path);
-    #else
     (void)path;
     return MP_IMPORT_STAT_NO_EXIST;
-    #endif
 }
 
-mp_obj_t vfs_proxy_call(qstr method_name, mp_uint_t n_args, const mp_obj_t *args);
 mp_obj_t mp_builtin_open(uint n_args, const mp_obj_t *args, mp_map_t *kwargs) {
-    #if MICROPY_VFS_FAT
-    // TODO: Handle kwargs!
-    return vfs_proxy_call(MP_QSTR_open, n_args, args);
-    #else
     return mp_const_none;
-    #endif
 }
 MP_DEFINE_CONST_FUN_OBJ_KW(mp_builtin_open_obj, 1, mp_builtin_open);
 
+#endif
+
 void MP_FASTCODE(nlr_jump_fail)(void *val) {
     printf("NLR jump failed\n");
     for (;;) {
diff --git a/esp8266/modules/_boot.py b/esp8266/modules/_boot.py
index c200b3d3f9..954a9ee284 100644
--- a/esp8266/modules/_boot.py
+++ b/esp8266/modules/_boot.py
@@ -5,7 +5,9 @@ from flashbdev import bdev
 
 try:
     if bdev:
-        vfs = uos.VfsFat(bdev, "")
+        vfs = uos.VfsFat(bdev)
+        uos.mount(vfs, '/flash')
+        uos.chdir('/flash')
 except OSError:
     import inisetup
     vfs = inisetup.setup()
diff --git a/esp8266/moduos.c b/esp8266/moduos.c
index 5f5aab1662..006fc49d61 100644
--- a/esp8266/moduos.c
+++ b/esp8266/moduos.c
@@ -26,14 +26,10 @@
 
 #include <string.h>
 
-#include "py/mpconfig.h"
-#include "py/nlr.h"
-#include "py/obj.h"
 #include "py/objtuple.h"
 #include "py/objstr.h"
-#include "py/runtime.h"
-#include "py/mperrno.h"
 #include "extmod/misc.h"
+#include "extmod/vfs.h"
 #include "extmod/vfs_fat.h"
 #include "genhdr/mpversion.h"
 #include "esp_mphal.h"
@@ -70,74 +66,6 @@ STATIC mp_obj_t os_uname(void) {
 }
 STATIC MP_DEFINE_CONST_FUN_OBJ_0(os_uname_obj, os_uname);
 
-#if MICROPY_VFS_FAT
-mp_obj_t vfs_proxy_call(qstr method_name, mp_uint_t n_args, const mp_obj_t *args) {
-    if (MP_STATE_PORT(fs_user_mount)[0] == NULL) {
-        mp_raise_OSError(MP_ENODEV);
-    }
-
-    mp_obj_t meth[n_args + 2];
-    mp_load_method(MP_STATE_PORT(fs_user_mount)[0], method_name, meth);
-    if (args != NULL) {
-        memcpy(meth + 2, args, n_args * sizeof(*args));
-    }
-    return mp_call_method_n_kw(n_args, 0, meth);
-}
-
-STATIC mp_obj_t os_listdir(mp_uint_t n_args, const mp_obj_t *args) {
-    return vfs_proxy_call(MP_QSTR_listdir, n_args, args);
-}
-STATIC MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(os_listdir_obj, 0, 1, os_listdir);
-
-STATIC mp_obj_t os_mkdir(mp_obj_t path_in) {
-    return vfs_proxy_call(MP_QSTR_mkdir, 1, &path_in);
-}
-STATIC MP_DEFINE_CONST_FUN_OBJ_1(os_mkdir_obj, os_mkdir);
-
-STATIC mp_obj_t os_rmdir(mp_obj_t path_in) {
-    return vfs_proxy_call(MP_QSTR_rmdir, 1, &path_in);
-}
-STATIC MP_DEFINE_CONST_FUN_OBJ_1(os_rmdir_obj, os_rmdir);
-
-STATIC mp_obj_t os_chdir(mp_obj_t path_in) {
-    return vfs_proxy_call(MP_QSTR_chdir, 1, &path_in);
-}
-STATIC MP_DEFINE_CONST_FUN_OBJ_1(os_chdir_obj, os_chdir);
-
-STATIC mp_obj_t os_getcwd(void) {
-    return vfs_proxy_call(MP_QSTR_getcwd, 0, NULL);
-}
-STATIC MP_DEFINE_CONST_FUN_OBJ_0(os_getcwd_obj, os_getcwd);
-
-STATIC mp_obj_t os_remove(mp_obj_t path_in) {
-    return vfs_proxy_call(MP_QSTR_remove, 1, &path_in);
-}
-STATIC MP_DEFINE_CONST_FUN_OBJ_1(os_remove_obj, os_remove);
-
-STATIC mp_obj_t os_rename(mp_obj_t path_old, mp_obj_t path_new) {
-    mp_obj_t args[2];
-    args[0] = path_old;
-    args[1] = path_new;
-    return vfs_proxy_call(MP_QSTR_rename, 2, args);
-}
-STATIC MP_DEFINE_CONST_FUN_OBJ_2(os_rename_obj, os_rename);
-
-STATIC mp_obj_t os_stat(mp_obj_t path_in) {
-    return vfs_proxy_call(MP_QSTR_stat, 1, &path_in);
-}
-STATIC MP_DEFINE_CONST_FUN_OBJ_1(os_stat_obj, os_stat);
-
-STATIC mp_obj_t os_statvfs(mp_obj_t path_in) {
-    return vfs_proxy_call(MP_QSTR_statvfs, 1, &path_in);
-}
-STATIC MP_DEFINE_CONST_FUN_OBJ_1(os_statvfs_obj, os_statvfs);
-
-STATIC mp_obj_t os_umount(void) {
-    return vfs_proxy_call(MP_QSTR_umount, 0, NULL);
-}
-STATIC MP_DEFINE_CONST_FUN_OBJ_0(os_umount_obj, os_umount);
-#endif
-
 STATIC mp_obj_t os_urandom(mp_obj_t num) {
     mp_int_t n = mp_obj_get_int(num);
     vstr_t vstr;
@@ -166,16 +94,17 @@ STATIC const mp_rom_map_elem_t os_module_globals_table[] = {
     #endif
     #if MICROPY_VFS_FAT
     { MP_ROM_QSTR(MP_QSTR_VfsFat), MP_ROM_PTR(&mp_fat_vfs_type) },
-    { MP_ROM_QSTR(MP_QSTR_listdir), MP_ROM_PTR(&os_listdir_obj) },
-    { MP_ROM_QSTR(MP_QSTR_mkdir), MP_ROM_PTR(&os_mkdir_obj) },
-    { MP_ROM_QSTR(MP_QSTR_rmdir), MP_ROM_PTR(&os_rmdir_obj) },
-    { MP_ROM_QSTR(MP_QSTR_chdir), MP_ROM_PTR(&os_chdir_obj) },
-    { MP_ROM_QSTR(MP_QSTR_getcwd), MP_ROM_PTR(&os_getcwd_obj) },
-    { MP_ROM_QSTR(MP_QSTR_remove), MP_ROM_PTR(&os_remove_obj) },
-    { MP_ROM_QSTR(MP_QSTR_rename), MP_ROM_PTR(&os_rename_obj) },
-    { MP_ROM_QSTR(MP_QSTR_stat), MP_ROM_PTR(&os_stat_obj) },
-    { MP_ROM_QSTR(MP_QSTR_statvfs), MP_ROM_PTR(&os_statvfs_obj) },
-    { MP_ROM_QSTR(MP_QSTR_umount), MP_ROM_PTR(&os_umount_obj) },
+    { MP_ROM_QSTR(MP_QSTR_listdir), MP_ROM_PTR(&mp_vfs_listdir_obj) },
+    { MP_ROM_QSTR(MP_QSTR_mkdir), MP_ROM_PTR(&mp_vfs_mkdir_obj) },
+    { MP_ROM_QSTR(MP_QSTR_rmdir), MP_ROM_PTR(&mp_vfs_rmdir_obj) },
+    { MP_ROM_QSTR(MP_QSTR_chdir), MP_ROM_PTR(&mp_vfs_chdir_obj) },
+    { MP_ROM_QSTR(MP_QSTR_getcwd), MP_ROM_PTR(&mp_vfs_getcwd_obj) },
+    { MP_ROM_QSTR(MP_QSTR_remove), MP_ROM_PTR(&mp_vfs_remove_obj) },
+    { MP_ROM_QSTR(MP_QSTR_rename), MP_ROM_PTR(&mp_vfs_rename_obj) },
+    { MP_ROM_QSTR(MP_QSTR_stat), MP_ROM_PTR(&mp_vfs_stat_obj) },
+    { MP_ROM_QSTR(MP_QSTR_statvfs), MP_ROM_PTR(&mp_vfs_statvfs_obj) },
+    { MP_ROM_QSTR(MP_QSTR_mount), MP_ROM_PTR(&mp_vfs_mount_obj) },
+    { MP_ROM_QSTR(MP_QSTR_umount), MP_ROM_PTR(&mp_vfs_umount_obj) },
     #endif
 };
 
diff --git a/esp8266/mpconfigport.h b/esp8266/mpconfigport.h
index 952e6bec91..1de65c911a 100644
--- a/esp8266/mpconfigport.h
+++ b/esp8266/mpconfigport.h
@@ -15,7 +15,7 @@
 #define MICROPY_MEM_STATS           (0)
 #define MICROPY_DEBUG_PRINTERS      (1)
 #define MICROPY_DEBUG_PRINTER_DEST  mp_debug_print
-#define MICROPY_READER_FATFS        (MICROPY_VFS_FAT)
+#define MICROPY_READER_VFS          (MICROPY_VFS)
 #define MICROPY_ENABLE_GC           (1)
 #define MICROPY_STACK_CHECK         (1)
 #define MICROPY_ENABLE_EMERGENCY_EXCEPTION_BUF (1)
@@ -94,13 +94,13 @@
 #define MICROPY_MODULE_FROZEN_LEXER mp_lexer_new_from_str32
 #define MICROPY_QSTR_EXTRA_POOL     mp_qstr_frozen_const_pool
 
+#define MICROPY_VFS                    (1)
 #define MICROPY_FATFS_OO               (1)
 #define MICROPY_FATFS_ENABLE_LFN       (1)
 #define MICROPY_FATFS_RPATH            (2)
 #define MICROPY_FATFS_VOLUMES          (2)
 #define MICROPY_FATFS_MAX_SS           (4096)
 #define MICROPY_FATFS_LFN_CODE_PAGE    (437) /* 1=SFN/ANSI 437=LFN/U.S.(OEM) */
-#define MICROPY_FSUSERMOUNT            (1)
 #define MICROPY_VFS_FAT                (1)
 #define MICROPY_ESP8266_APA102         (1)
 #define MICROPY_ESP8266_NEOPIXEL       (1)
@@ -141,6 +141,11 @@ void *esp_native_code_commit(void*, size_t);
 #define mp_type_fileio fatfs_type_fileio
 #define mp_type_textio fatfs_type_textio
 
+// use vfs's functions for import stat and builtin open
+#define mp_import_stat mp_vfs_import_stat
+#define mp_builtin_open mp_vfs_open
+#define mp_builtin_open_obj mp_vfs_open_obj
+
 // extra built in names to add to the global namespace
 #define MICROPY_PORT_BUILTINS \
     { MP_OBJ_NEW_QSTR(MP_QSTR_input), (mp_obj_t)&mp_builtin_input_obj }, \
diff --git a/esp8266/mpconfigport_512k.h b/esp8266/mpconfigport_512k.h
index d1d6025793..322fb4151a 100644
--- a/esp8266/mpconfigport_512k.h
+++ b/esp8266/mpconfigport_512k.h
@@ -5,8 +5,8 @@
 #undef MICROPY_EMIT_INLINE_XTENSA
 #define MICROPY_EMIT_INLINE_XTENSA      (0)
 
-#undef MICROPY_FSUSERMOUNT
-#define MICROPY_FSUSERMOUNT             (0)
+#undef MICROPY_VFS
+#define MICROPY_VFS                     (0)
 #undef MICROPY_VFS_FAT
 #define MICROPY_VFS_FAT                 (0)
 
@@ -25,3 +25,7 @@
 
 #undef MICROPY_PY_FRAMEBUF
 #define MICROPY_PY_FRAMEBUF             (0)
+
+#undef mp_import_stat
+#undef mp_builtin_open
+#undef mp_builtin_open_obj
diff --git a/esp8266/qstrdefsport.h b/esp8266/qstrdefsport.h
index 7610eb33da..676b3bae77 100644
--- a/esp8266/qstrdefsport.h
+++ b/esp8266/qstrdefsport.h
@@ -27,5 +27,5 @@
 // qstrs specific to this port, only needed if they aren't auto-generated
 
 // Entries for sys.path
-Q(/)
-Q(/lib)
+Q(/flash)
+Q(/flash/lib)
diff --git a/esp8266/scripts/inisetup.py b/esp8266/scripts/inisetup.py
index 3930089db6..29421e7923 100644
--- a/esp8266/scripts/inisetup.py
+++ b/esp8266/scripts/inisetup.py
@@ -37,8 +37,10 @@ def setup():
     print("Performing initial setup")
     wifi()
     uos.VfsFat.mkfs(bdev)
-    vfs = uos.VfsFat(bdev, "")
-    with open("/boot.py", "w") as f:
+    vfs = uos.VfsFat(bdev)
+    uos.mount(vfs, '/flash')
+    uos.chdir('/flash')
+    with open("boot.py", "w") as f:
         f.write("""\
 # This file is executed on every boot (including wake-boot from deepsleep)
 #import esp