MerpMod is a patch designed for Subaru ecu roms. The goal of this project is to bring advanced features to the oem ecu.
You may find more information at the RomRaider 32bit Speed Density forum: https://www.romraider.com/forum/viewforum.php?f=37
These Mods are applied or removed using the SharpTune application from https://github.com/Merp/SharpTune
Mods require custom definition files to edit and log. Please see the definition info below.
After patching, it is normal to receive a checksum error when opening the rom in ECUFlash. Always click yes to correct the checksum.
The default tables included in the mods ARE NOT BASE MAPS, you will need to FIND/CREATE YOUR OWN BASE MAP!!
This code can be compiled using a variety of different methods and toolchains. This will outline the method that I have used.
Download and install latest Renesas HEW (High Performance Embedded Workshop) from https://www.renesas.com/en-us/products/software-tools/evaluation-software-tools.html (HEW is bundled with the C/C++ Compiler for SuperH Family)
Download and install the latest GNUSH toolchain from https://gcc-renesas.com During the installation, opt to register the toolchain with HEW.
Clone this repository locally.
MerpMod depends on SharpTune and SubaruDefs to compile patches.
Clone https://github.com/Merp/SubaruDefs
Clone https://github.com/Merp/SharpTune or download SharpTune.exe. Copy SharpTune.exe to the MerpMod base directory and run it. Select the previously cloned SubaruDefs repository as the definition repo from Menu->Settings->Definition Repo Location. Close SharpTune.
#Target ROM Selection
To select your target ROM, you must set the target rom placeholder (similar to an environment variable) for the ROM's CALID. TO do this, go to Setup->Customize->Placeholders
The following placeholders should be set by default. Placeholder Directory TARGETROM <YOUR ROM'S CALID> TESTROMDIR $(PROJDIR)\TestRom
#EcuMapTools
SharpTune allows users to import .map files, and converts these to .h header files for use in HEW. This conversion is defined by idatohew.xml.
Map files are imported from /SubaruDisassembly/Maps where / is the folder containing your cloned MerpMod repository.
Entries in the header are persistent (as long as they are defined in idatohew.xml) but are always overridden by entries in the map file! As such, Erroneous entries in the header file must be removed directly from the header file unless overridden by an entry in the map file.
#Build Phases
We need to create two phases, one to update and select the target headers before we compile the code (first build phase), and another to update and patch the rom with the code after it is compiled (last build phase)
To create a build phase: In HEW, select Build->Build Phases.. Click add, select Create new custom phase, then click next. Select 'Single Phase' and click next. Enter the appropriate information.
Target Selection phase:
Command: TargetSelection.bat (included in repo)
Initial Directory:
Update Test Rom phase:
Command: Update.bat (included in repo)
Initial Directory:
#Linker Sections and Script
Linker sections are defined under Build->KPIT GNUSH [ELF] Toolchain..->Link/Library->Category:Sections
Sections should be organized as follows: 0x00000000 Zero 0x00000100 INTHandler 0x00E00000 RSTHandler 0x00F00000 DefinitionData 0x07001000 .text,.init,.fini,.got,.rodata,.eh_frame_hdr,.eh_frame,.jcr,.tors 0x0E005000 Misc 0x70000000 .data,.gcc_exc,.bss 0x73FFFBF0 .stack 0x80001000 MetaData
Linker script is set up under Category:Other. Under User Defined options, enter the following: -e _ResetHandler -T "$(PROJDIR)\LinkerScript.txt"
##Build Configurations
Build configuration is passed to SharpTune and back, which determines the config header file used (to select features/options) and determine the appropriate output directories/filenames. e.g. Build config "Flash_Testing" will use Flash.h to select the features by preprocessor options, and after building produces patch files named .MerpMod.Flash.Testing..patch that are saved in the Flash_Testing folder. Also, only "_Testing" or "_Release" configs produce definition files, so using "*_Debug" allows you to debug the code in HEW without generating a million useless definitions. More details on these later.
Configurations:
Gratis (Deprecated, succeeded by Flash): Speed Density Launch Control Flat Foot Shift
Flash (stable): Speed Density Launch Control Flat Foot Shift CEL Flashing (2-stage FBKC, ECT, and more)
Switch: (alpha/untested) Flash + Advanced Launch Control + 3x2 Map Switching/Blending
#Definitions
Definitions are available from https://github.com/Merp/SubaruDefs and are divided into three categories. First decide which you need.
Stable: Thoroughly tested but limited in scope.
Beta: Beta tested, contains some new experimental parameters but not everything. Download
Alpha: Untested, contains the bleeding edge parameters. Recommended for advanced tuners or developers only! Download
MerpMod: Based on Alpha, includes definitions for SharpTune Mods. Download
Click the appropriate download link above and extract this zip file to your SharpTune settings directory (default is //.sharptune/). Alternatively, save and extract wherever you like and point SharpTune’s Definition Repo Location to it (under the Settings menu).
ECU and Logger definitions are currently hosted on github.com. More information about git can be found here. ECUFlash definition setup:
After extracting the ZIP, open ECUFlash settings and point the ‘rom metadata’ setting to the subdirectory ‘ECUFlash/subaru standard’. Currently, the metric definitions are incomplete! Note: RomRaider editor definitions are not included/supported/planned. RomRaider logger definition setup:
After extracting the ZIP, open RomRaider settings and set the ‘logger definition location’ to the appropriate definition file. For MerpMod branch use ‘RomRaider/logger/MerpMod//.xml’. For all other branches use ‘RomRaider/logger/.xml Credits: -Merp - SharpTune GUI Design, RomModCore upgrades, Subaru mod development -NSFW - RomModCore (Previously RomPatch), Subaru mod development (Transition to HEW) -Dschultz - XMLtoIDC and RomRaider -Freon - Original SD assembly patch and disassembly information -RomRaider.com forums License: This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.