Fix n3ds firm patching

go_n3ds.cmd

@@ -0,0 +1,7 @@
+mkdir temp\
+
+cp input\firmware_twl.bin temp\
+
+cd scripts
+
+patch_dev_launcher_n3ds.cmd

go_o3ds.cmd

@@ -0,0 +1,7 @@
+mkdir temp\
+
+cp input\firmware_twl.bin temp\
+
+cd scripts
+
+patch_dev_launcher_o3ds.cmd

scripts/extract_dev_launcher_srl_from_twlbg_cxi_n3ds.py

@@ -0,0 +1,112 @@
+# -*- coding: utf8 -*-
+# Patch an .nds (works with homebrew and ds demo only) to make it ready for make_cia
+#
+# 2016-02-28, Ahezard 
+#
+# inspired by 
+# Apache Thunder .nds edited files and comments
+# https://github.com/Relys/Project_CTR/blob/master/makerom/srl.h
+# https://dsibrew.org/wiki/DSi_Cartridge_Header
+# if the header size of the input nds file is 0x200 (homebrew)
+# the header size of the output nds file will be patched to 0x4000 (normal ds/dsi header), 0x3E00 offset
+
+from struct import *
+from collections import namedtuple
+from collections import OrderedDict
+from pprint import pprint
+import os, sys
+import binascii
+import argparse
+
+
+parser = argparse.ArgumentParser(description='extract devLauncherSrl from the twl_bg.cxi')
+parser.add_argument('--cxi', help='cxi file')
+parser.add_argument('--out', help='output cxi file')
+args = parser.parse_args()
+
+#
+# CRC16 MODULE
+#
+# includes CRC16 and CRC16 MODBUS
+#
+
+from ctypes import c_ushort
+
+# from https://github.com/cristianav/PyCRC/blob/master/demo.py
+class CRC16(object):
+    crc16_tab = []
+
+    # The CRC's are computed using polynomials. Here is the most used
+    # coefficient for CRC16
+    crc16_constant = 0xA001  # 40961
+
+    def __init__(self, modbus_flag=False):
+        # initialize the precalculated tables
+        if not len(self.crc16_tab):
+            self.init_crc16()
+        self.mdflag = bool(modbus_flag)
+
+    def calculate(self, input_data=None):
+        try:
+            is_string = isinstance(input_data, str)
+            is_bytes = isinstance(input_data, (bytes, bytearray))
+
+            if not is_string and not is_bytes:
+                raise Exception("Please provide a string or a byte sequence "
+                                "as argument for calculation.")
+
+            crc_value = 0x0000 if not self.mdflag else 0xffff
+
+            for c in input_data:
+                d = ord(c) if is_string else c
+                tmp = crc_value ^ d
+                rotated = crc_value >> 8
+                crc_value = rotated ^ self.crc16_tab[(tmp & 0x00ff)]
+
+            return crc_value
+        except Exception as e:
+            print("EXCEPTION(calculate): {}".format(e))
+
+    def init_crc16(self):
+        """The algorithm uses tables with precalculated values"""
+        for i in range(0, 256):
+            crc = c_ushort(i).value
+            for j in range(0, 8):
+                if crc & 0x0001:
+                    crc = c_ushort(crc >> 1).value ^ self.crc16_constant
+                else:
+                    crc = c_ushort(crc >> 1).value
+            self.crc16_tab.append(crc)
+
+def getSize(fileobject):
+	current = fileobject.tell()
+	fileobject.seek(0,2) # move the cursor to the end of the file
+	size = fileobject.tell()
+	fileobject.seek(current,0)
+	return size
+
+def skipUntilAddress(f_in,f_out, caddr, taddr):
+	chunk = f_in.read(taddr-caddr)
+	f_out.write(chunk)
+
+def writeBlankuntilAddress(f_out, caddr, taddr):
+	f_out.write("\x00"*(taddr-caddr))
+
+cxi_fname=args.cxi
+
+srlsizeoffset=0xCDE88
+srlsize=0xB9400
+
+# write the file
+filer = open(cxi_fname, 'rb')
+filew = open(args.out, "wb")
+
+filesize=getSize(filer) 
+
+filer.read(srlsizeoffset);
+
+skipUntilAddress(filer,filew,srlsizeoffset,srlsize+srlsizeoffset)
+
+filew.close()
+filer.close()
+	

scripts/patch_dev_launcher_n3ds.cmd

@@ -9,7 +9,7 @@ pause
 
 ..\tools\3dstool.exe -xuvtf exefs twlBg.exefs --header twlBg.exefs.header --exefs-dir twlBg_original_exefs
 
-python ..\scripts\extract_dev_launcher_srl_from_twlbg_cxi.py --cxi twlBg_original_exefs/code.bin --out devSRLlauncher_original_enc.nds
+python ..\scripts\extract_dev_launcher_srl_from_twlbg_cxi_n3ds.py --cxi twlBg_original_exefs/code.bin --out devSRLlauncher_original_enc.nds
 
 ..\tools\twltool.exe modcrypt --in devSRLlauncher_original_enc.nds --out devSRLlauncher_original_dec.nds
 

scripts/patch_dev_launcher_o3ds.cmd

@@ -0,0 +1,34 @@
+@@Echo off
+cd ../temp
+..\tools\ctrtool.exe -xt firm --firmdir firm firmware_twl.bin 
+cp firm/firm_0_18000000.bin twlBg_original.cxi
+
+pause
+
+..\tools\3dstool.exe -xvtf cxi twlBg_original.cxi --header twlBg.ncch.header --exh twlBg.exheader.bin --exefs twlBg.exefs
+
+..\tools\3dstool.exe -xuvtf exefs twlBg.exefs --header twlBg.exefs.header --exefs-dir twlBg_original_exefs
+
+python ..\scripts\extract_dev_launcher_srl_from_twlbg_cxi_o3ds.py --cxi twlBg_original_exefs/code.bin --out devSRLlauncher_original_enc.nds
+
+..\tools\twltool.exe modcrypt --in devSRLlauncher_original_enc.nds --out devSRLlauncher_original_dec.nds
+
+..\tools\ndstool.exe -i devSRLlauncher_original_dec.nds > devSRLlauncher_original_header.txt
+
+..\tools\ndstool.exe -x -9 devSRLlauncher_original_dec.arm9 -7 devSRLlauncher_original_dec.arm7 devSRLlauncher_original_dec.nds
+
+python ..\scripts\patchDevLauncher.py --srl devSRLlauncher_original_dec.nds --out devSRLlauncher_patched_dec.nds
+
+copy devSRLlauncher_patched_dec.nds devSRLlauncher_patched_enc.nds
+..\tools\TWLTool.exe modcrypt --in %1 devSRLlauncher_patched_enc.nds
+
+mkdir twlBg_patched_exefs 
+
+python ..\scripts\build_twlbg_code_from_dev_launcher_srl.py --srl=devSRLlauncher_patched_enc.nds --code=twlBg_original_exefs\code.bin --out=twlBg_patched_exefs\code.bin 
+
+..\tools\3dstool.exe -czvtf exefs twlBg_patched.exefs --header twlBg.exefs.header --exefs-dir twlBg_patched_exefs
+
+..\tools\3dstool.exe -cvtf cxi ..\twlBg.cxi --header twlBg.ncch.header --exh twlBg.exheader.bin --exefs twlBg_patched.exefs
+
+cd ..\scripts
+pause