Port fat_io_lib, mount atasd0mp1 as sys:

kernel/Makefile

@@ -22,6 +22,8 @@ CFLAGS += -I. \
           -DLFS_NO_WARN \
           -DLFS_NO_ERROR \
 					-DFASTLZ_USE_MEMMOVE=0 \
+					-DFATFS_MAX_OPEN_FILES=128 \
+					-D"FAT_PRINTF(a)"
 
 include arch/$(ARCH)/$(ARCH).mk
 
@@ -45,6 +47,8 @@ SRCFILES += $(call GRABSRC, \
               fs/kvfs \
               fs/littlefs \
               fs/portlfs \
+							fs/fatfs \
+							fs/portfatfs \
               baseimg \
               proc \
               std \