esp8266: Enable FatFs support.

esp8266/Makefile

@@ -75,6 +75,7 @@ SRC_C = \
 	utils.c \
 	ets_alt_task.c \
 	$(BUILD)/frozen.c \
+	fatfs_port.o \
 
 STM_SRC_C = $(addprefix stmhal/,\
 	pybstdio.c \
@@ -109,6 +110,8 @@ LIB_SRC_C = $(addprefix lib/,\
 	timeutils/timeutils.c \
 	utils/pyexec.c \
 	utils/printf.c \
+	fatfs/ff.c \
+	fatfs/option/ccsbcs.c \
 	)
 
 SRC_S = \

esp8266/fatfs_port.c

@@ -0,0 +1,6 @@
+#include "lib/fatfs/ff.h"
+#include "lib/fatfs/diskio.h"
+
+DWORD get_fattime(void) {
+    return 0;
+}

esp8266/moduos.c

@@ -34,6 +34,8 @@
 #include "genhdr/mpversion.h"
 #include "user_interface.h"
 
+extern const mp_obj_type_t mp_fat_vfs_type;
+
 STATIC const qstr os_uname_info_fields[] = {
     MP_QSTR_sysname, MP_QSTR_nodename,
     MP_QSTR_release, MP_QSTR_version, MP_QSTR_machine
@@ -68,6 +70,9 @@ STATIC MP_DEFINE_CONST_FUN_OBJ_0(os_uname_obj, os_uname);
 STATIC const mp_map_elem_t os_module_globals_table[] = {
     { MP_OBJ_NEW_QSTR(MP_QSTR___name__),        MP_OBJ_NEW_QSTR(MP_QSTR_uos) },
     { MP_OBJ_NEW_QSTR(MP_QSTR_uname),           (mp_obj_t)&os_uname_obj },
+    #if MICROPY_VFS_FAT
+    { MP_ROM_QSTR(MP_QSTR_VfsFat), (mp_obj_t)&mp_fat_vfs_type },
+    #endif
 };
 
 STATIC MP_DEFINE_CONST_DICT(os_module_globals, os_module_globals_table);

esp8266/mpconfigport.h

@@ -59,6 +59,14 @@
 #define MICROPY_MODULE_FROZEN       (1)
 #define MICROPY_MODULE_FROZEN_LEXER mp_lexer_new_from_str32
 
+#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_EVENT_POLL_HOOK {ets_event_poll();}
 
 // type definitions for the specific machine