diff --git a/.gitignore b/.gitignore
index f454228..35ce465 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,6 +1,7 @@
 build
-arm9/data/load.bin
+data/load.bin
 *.elf
 *.nds
+*.dsi
 *.pcf
 *.dldi
diff --git a/Makefile b/Makefile
index bc938e2..97377e5 100644
--- a/Makefile
+++ b/Makefile
@@ -22,12 +22,12 @@ GAME_SUBTITLE2 := www.acekard.com
 
 include $(DEVKITARM)/ds_rules
 
-.PHONY: checkarm7 checkarm9 clean
+.PHONY: checkarm7 checkarm9 checkarm9_dsi clean
 
 #---------------------------------------------------------------------------------
 # main targets
 #---------------------------------------------------------------------------------
-all: checkarm7 checkarm9 $(TARGET).nds
+all: checkarm7 checkarm9 checkarm9_dsi $(TARGET).nds $(TARGET).dsi
 
 #---------------------------------------------------------------------------------
 checkarm7:
@@ -37,12 +37,22 @@ checkarm7:
 checkarm9:
 	$(MAKE) -C arm9
 
+#---------------------------------------------------------------------------------
+checkarm9_dsi:
+	$(MAKE) -C arm9_dsi
+
 #---------------------------------------------------------------------------------
 $(TARGET).nds : $(NITRO_FILES) arm7/$(TARGET).elf arm9/$(TARGET).elf
 	ndstool	-c $(TARGET).nds -7 arm7/$(TARGET).elf -9 arm9/$(TARGET).elf \
 	-b $(GAME_ICON) "$(GAME_TITLE);$(GAME_SUBTITLE1);$(GAME_SUBTITLE2)" \
 	$(_ADDFILES)
 
+#---------------------------------------------------------------------------------
+$(TARGET).dsi : $(NITRO_FILES) arm7/$(TARGET).elf arm9_dsi/$(TARGET).elf
+	ndstool	-c $@ -7 arm7/$(TARGET).elf -9 arm9_dsi/$(TARGET).elf \
+	-b $(GAME_ICON) "$(GAME_TITLE);$(GAME_SUBTITLE1);$(GAME_SUBTITLE2)" \
+	$(_ADDFILES)
+
 #---------------------------------------------------------------------------------
 arm7/$(TARGET).elf:
 	$(MAKE) -C arm7
@@ -51,8 +61,13 @@ arm7/$(TARGET).elf:
 arm9/$(TARGET).elf:
 	$(MAKE) -C arm9
 
+#---------------------------------------------------------------------------------
+arm9_dsi/$(TARGET).elf:
+	$(MAKE) -C arm9_dsi
+
 #---------------------------------------------------------------------------------
 clean:
 	$(MAKE) -C arm9 clean
+	$(MAKE) -C arm9_dsi clean
 	$(MAKE) -C arm7 clean
-	rm -f $(TARGET).nds
+	rm -f *.nds *.dsi
diff --git a/arm9/Makefile b/arm9/Makefile
index 6835215..494b496 100644
--- a/arm9/Makefile
+++ b/arm9/Makefile
@@ -18,7 +18,7 @@ include $(DEVKITARM)/ds_rules
 BUILD    := build
 SOURCES  := source source/ui source/font source/launcher source/saves
 INCLUDES := include ../share $(SOURCES)
-DATA     := data
+DATA     := data ../data
 GRAPHICS :=
 
 #---------------------------------------------------------------------------------
@@ -27,7 +27,10 @@ GRAPHICS :=
 ARCH := -marm -mthumb-interwork -march=armv5te -mtune=arm946e-s
 
 CFLAGS   := -g -Wall -O3\
-            $(ARCH) $(INCLUDE) -DARM9 -D_NO_BOOTSTUB_
+            $(ARCH) $(INCLUDE) -DARM9
+
+CFLAGS   += -D_NO_BOOTSTUB_
+
 CXXFLAGS := $(CFLAGS) -fno-rtti -fno-exceptions
 ASFLAGS  := -g $(ARCH)
 LDFLAGS   = -specs=ds_arm9.specs -g $(ARCH) -Wl,-Map,$(notdir $*.map)
diff --git a/arm9/source/launcher/NdsBootstrapLauncher.cpp b/arm9/source/launcher/NdsBootstrapLauncher.cpp
index 4f07542..426bb72 100644
--- a/arm9/source/launcher/NdsBootstrapLauncher.cpp
+++ b/arm9/source/launcher/NdsBootstrapLauncher.cpp
@@ -17,6 +17,7 @@
 #include "../dsrom.h"
 #include "../flags.h"
 #include "../inifile.h"
+#include "../mainlist.h"
 #include "ILauncher.h"
 #include "NdsBootstrapLauncher.h"
 #include "nds_loader_arm9.h"
@@ -71,28 +72,20 @@ bool NdsBootstrapLauncher::prepareIni() {
 
 bool NdsBootstrapLauncher::launchRom(std::string romPath, std::string savePath, u32 flags,
                                      u32 cheatOffset, u32 cheatSize) {
-    std::string ndsBootstrapPath = "/_nds/nds-bootstrap-release.nds";
+    const char ndsBootstrapPath[] = SD_ROOT_0 "/_nds/nds-bootstrap-release.nds";
     std::vector<const char*> argv;
 
     mRomPath = romPath;
     mSavePath = savePath;
     mFlags = flags;
 
-    // mRomPath *should* have the drive name set
-    // If it doesn't for some reason, default to `fat:/`, because most people are probably using
-    // this on flashcart
-    if (mRomPath.find("sd:/", 0) == std::string::npos)
-        ndsBootstrapPath = "fat:" + ndsBootstrapPath;
-    else
-        ndsBootstrapPath = "sd:" + ndsBootstrapPath;
-
     // Create the nds-bootstrap directory if it doesn't exist
     if (access("/_nds/nds-bootstrap/", F_OK) != 0) {
         mkdir("/_nds/nds-bootstrap/", 0777);
     }
 
     // Setup argv to launch nds-bootstrap
-    argv.push_back(ndsBootstrapPath.c_str());
+    argv.push_back(ndsBootstrapPath);
 
     // Prepare cheat codes if enabled
     if (flags & PATCH_CHEATS) {
diff --git a/arm9/source/mainlist.cpp b/arm9/source/mainlist.cpp
index eabf4fa..067135d 100644
--- a/arm9/source/mainlist.cpp
+++ b/arm9/source/mainlist.cpp
@@ -321,7 +321,8 @@ void cMainList::backParentDir() {
     if ("..." == _currentDir) return;
 
     bool fat1 = (SD_ROOT == _currentDir), favorites = ("favorites:/" == _currentDir);
-    if ("fat:/" == _currentDir || fat1 || favorites || "/" == _currentDir) {
+    if ("fat:/" == _currentDir || "sd:/" == _currentDir || fat1 || favorites ||
+        "/" == _currentDir) {
         enterDir("...");
         if (fat1) selectRow(_topuSD);
         if (favorites) selectRow(_topFavorites);
diff --git a/arm9/source/mainlist.h b/arm9/source/mainlist.h
index 804269e..1374d06 100644
--- a/arm9/source/mainlist.h
+++ b/arm9/source/mainlist.h
@@ -17,7 +17,11 @@
 #include "touchmessage.h"
 #include "zoomingicon.h"
 
+#ifndef __DSIMODE__
 #define SD_ROOT_0 "fat:"
+#else
+#define SD_ROOT_0 "sd:"
+#endif
 #define SD_ROOT SD_ROOT_0 "/"
 
 // 显示游戏列表，文件列表等等
diff --git a/arm9/source/mainwnd.cpp b/arm9/source/mainwnd.cpp
index 8773998..51fca9d 100644
--- a/arm9/source/mainwnd.cpp
+++ b/arm9/source/mainwnd.cpp
@@ -583,7 +583,7 @@ void cMainWnd::setParam(void) {
             gs().uiName = uiNames[uiIndexAfter];
             gs().langDirectory = langNames[langIndexAfter];
             gs().saveSettings();
-            HomebrewLauncher().launchRom("fat:/akmenu4.nds", "", 0, 0, 0);
+            HomebrewLauncher().launchRom("/akmenu4.nds", "", 0, 0, 0);
         }
     }
 
@@ -593,7 +593,7 @@ void cMainWnd::setParam(void) {
         if (ID_YES == ret) {
             gs().langDirectory = langNames[langIndexAfter];
             gs().saveSettings();
-            HomebrewLauncher().launchRom("fat:/akmenu4.nds", "", 0, 0, 0);
+            HomebrewLauncher().launchRom("/akmenu4.nds", "", 0, 0, 0);
         }
     }
 
diff --git a/arm9/source/rominfownd.cpp b/arm9/source/rominfownd.cpp
index f6ff9fa..e2a69a3 100644
--- a/arm9/source/rominfownd.cpp
+++ b/arm9/source/rominfownd.cpp
@@ -211,7 +211,7 @@ void cRomInfoWnd::setFileInfo(const std::string& fullName, const std::string& sh
         return;
     }
 
-    if ("fat:/" == fullName) {
+    if ("fat:/" == fullName || "sd:/" == fullName) {
         return;
     }
 
diff --git a/arm9/source/systemfilenames.h b/arm9/source/systemfilenames.h
index 57b9c35..1d63254 100644
--- a/arm9/source/systemfilenames.h
+++ b/arm9/source/systemfilenames.h
@@ -9,7 +9,11 @@
 
 #pragma once
 
+#ifndef __DSIMODE__
 #define SFN_SYSTEM_DIR "fat:/__rpg/"
+#else
+#define SFN_SYSTEM_DIR "sd:/__rpg/"
+#endif
 #define SFN_OFFICIAL_SAVELIST SFN_SYSTEM_DIR "savelist.bin"
 #define SFN_CUSTOM_SAVELIST SFN_SYSTEM_DIR "gamedata.bin"
 #define SFN_LAST_SAVEINFO SFN_SYSTEM_DIR "lastsave.ini"
diff --git a/arm9_dsi/Makefile b/arm9_dsi/Makefile
new file mode 100644
index 0000000..837aa5f
--- /dev/null
+++ b/arm9_dsi/Makefile
@@ -0,0 +1,141 @@
+#---------------------------------------------------------------------------------
+.SUFFIXES:
+#---------------------------------------------------------------------------------
+ifeq ($(strip $(DEVKITARM)),)
+$(error "Please set DEVKITARM in your environment. export DEVKITARM=<path to>devkitARM")
+endif
+
+include $(DEVKITARM)/ds_rules
+
+SOURCE_PATH := ../arm9
+#---------------------------------------------------------------------------------
+# BUILD is the directory where object files & intermediate files will be placed
+# SOURCES is a list of directories containing source code
+# INCLUDES is a list of directories containing extra header files
+# DATA is a list of directories containing binary files embedded using bin2o
+# GRAPHICS is a list of directories containing image files to be converted with grit
+# all directories are relative to this makefile
+#---------------------------------------------------------------------------------
+BUILD    := build
+SOURCES  := $(SOURCE_PATH)/source $(SOURCE_PATH)/source/ui $(SOURCE_PATH)/source/font $(SOURCE_PATH)/source/launcher $(SOURCE_PATH)/source/saves
+INCLUDES := $(SOURCE_PATH)/include ../share $(SOURCES)
+DATA     := $(SOURCE_PATH)/data ../data
+GRAPHICS :=
+
+#---------------------------------------------------------------------------------
+# options for code generation
+#---------------------------------------------------------------------------------
+ARCH := -marm -mthumb-interwork -march=armv5te -mtune=arm946e-s
+
+CFLAGS   := -g -Wall -O3\
+            $(ARCH) $(INCLUDE) -DARM9
+
+CFLAGS   += -D_NO_BOOTSTUB_ -D__DSIMODE__
+
+CXXFLAGS := $(CFLAGS) -fno-rtti -fno-exceptions
+ASFLAGS  := -g $(ARCH)
+LDFLAGS   = -specs=ds_arm9.specs -g $(ARCH) -Wl,-Map,$(notdir $*.map)
+
+#---------------------------------------------------------------------------------
+# any extra libraries we wish to link with the project
+#---------------------------------------------------------------------------------
+LIBS := -lfat -lnds9
+
+#---------------------------------------------------------------------------------
+# list of directories containing libraries, this must be the top level containing
+# include and lib
+#---------------------------------------------------------------------------------
+LIBDIRS := $(LIBNDS) $(PORTLIBS)
+
+#---------------------------------------------------------------------------------
+# no real need to edit anything past this point unless you need to add additional
+# rules for different file extensions
+#---------------------------------------------------------------------------------
+ifneq ($(BUILD),$(notdir $(CURDIR)))
+#---------------------------------------------------------------------------------
+
+export ARM9ELF := $(CURDIR)/$(TARGET).elf
+
+export VPATH := $(foreach dir,$(SOURCES),$(CURDIR)/$(dir))\
+                $(foreach dir,$(DATA),$(CURDIR)/$(dir))\
+                $(foreach dir,$(GRAPHICS),$(CURDIR)/$(dir))
+
+export DEPSDIR := $(CURDIR)/$(BUILD)
+
+CFILES   := $(foreach dir,$(SOURCES),$(notdir $(wildcard $(dir)/*.c)))
+CPPFILES := $(foreach dir,$(SOURCES),$(notdir $(wildcard $(dir)/*.cpp)))
+SFILES   := $(foreach dir,$(SOURCES),$(notdir $(wildcard $(dir)/*.s)))
+PNGFILES := $(foreach dir,$(GRAPHICS),$(notdir $(wildcard $(dir)/*.png)))
+BINFILES := $(foreach dir,$(DATA),$(notdir $(wildcard $(dir)/*.*)))
+
+#---------------------------------------------------------------------------------
+# use CXX for linking C++ projects, CC for standard C
+#---------------------------------------------------------------------------------
+ifeq ($(strip $(CPPFILES)),)
+#---------------------------------------------------------------------------------
+  export LD := $(CC)
+#---------------------------------------------------------------------------------
+else
+#---------------------------------------------------------------------------------
+  export LD := $(CXX)
+#---------------------------------------------------------------------------------
+endif
+#---------------------------------------------------------------------------------
+
+export OFILES_BIN   :=	$(addsuffix .o,$(BINFILES))
+
+export OFILES_SOURCES := $(CPPFILES:.cpp=.o) $(CFILES:.c=.o) $(SFILES:.s=.o)
+
+export OFILES := $(PNGFILES:.png=.o) $(OFILES_BIN) $(OFILES_SOURCES)
+
+export HFILES := $(PNGFILES:.png=.h) $(addsuffix .h,$(subst .,_,$(BINFILES)))
+
+export INCLUDE  := $(foreach dir,$(INCLUDES),-iquote $(CURDIR)/$(dir))\
+                   $(foreach dir,$(LIBDIRS),-I$(dir)/include)\
+                   -I$(CURDIR)/$(BUILD)
+export LIBPATHS := $(foreach dir,$(LIBDIRS),-L$(dir)/lib)
+
+.PHONY: $(BUILD) clean
+
+#---------------------------------------------------------------------------------
+$(BUILD):
+	@[ -d $@ ] || mkdir -p $@
+	@$(MAKE) --no-print-directory -C $(BUILD) -f $(CURDIR)/Makefile
+
+#---------------------------------------------------------------------------------
+clean:
+	@echo clean ...
+	@rm -fr $(BUILD) $(TARGET).elf
+
+
+#---------------------------------------------------------------------------------
+else
+
+#---------------------------------------------------------------------------------
+# main targets
+#---------------------------------------------------------------------------------
+$(ARM9ELF) : $(OFILES)
+	@echo linking $(notdir $@)
+	@$(LD)  $(LDFLAGS) $(OFILES) $(LIBPATHS) $(LIBS) -o $@
+
+#---------------------------------------------------------------------------------
+%.bin.o %_bin.h : %.bin
+#---------------------------------------------------------------------------------
+	@echo $(notdir $<)
+	@$(bin2o)
+
+#---------------------------------------------------------------------------------
+# This rule creates assembly source files using grit
+# grit takes an image file and a .grit describing how the file is to be processed
+# add additional rules like this for each image extension
+# you use in the graphics folders
+#---------------------------------------------------------------------------------
+%.s %.h: %.png %.grit
+#---------------------------------------------------------------------------------
+	grit $< -fts -o$*
+
+-include $(DEPSDIR)/*.d
+
+#---------------------------------------------------------------------------------------
+endif
+#---------------------------------------------------------------------------------------
diff --git a/build.sh b/build.sh
index 3d19fe1..dfbcd7f 100755
--- a/build.sh
+++ b/build.sh
@@ -1,3 +1,5 @@
-mkdir arm9/data
-make -C nds-bootloader LOADBIN=$PWD/arm9/data/load.bin
+set -e
+
+mkdir -p data
+make -C nds-bootloader LOADBIN=$PWD/data/load.bin
 make
diff --git a/clean.sh b/clean.sh
index 6f9aebe..eaa85fa 100755
--- a/clean.sh
+++ b/clean.sh
@@ -1,3 +1,3 @@
 make clean
 make -C nds-bootloader clean
-rm arm9/data/load.bin
+rm data/load.bin