Help Getting Started With Ghidra For MPC562 ME9.6.1 VE E77 LY7

[Lucasperks06]

Gday, i was wondering if anyone would be able to point me in the right direction or potentially give me a starting guide on how to start using ghidra, my main goal is to try and define more maps for my xdf, as im currently using a mappack from a similar ecu, which has gotten me very far, but there are still so many useful maps and codewords that i cant find using that method (i made a post just before about the xdf if anyones interested) viewtopic.php?t=9309
im very determined to try and learn how to disasemble, i just cant figure out where to start, or what to do, as from what ive found there arent really any "step by step" guides which i wouldnt expect there to be anyway. which really thats how everything ive done thats tuning related is, you just research as much as you can and figure it out.
just thought id post this and see if anyone can recommend where to start.
theres still things im unsure of like if my bin needs to be 2mb or 2.5mb, or how to locate r2 and r13 registers, or what there used for. i think ive thrown myself into the deep end so it all seems confusing.
ill post my bin up too, its not the file off my car its just a stock tune but same SW number. ive only got a hp converted 2mb bin, is the 2.5mb full read necessary for disasembly?
any help is appreciated, thanks heaps.

E77-2009.5-VE-LY7-Sedan MBmanual-12628463-92263439-YRTX_exported.bin

[antus]

It is confusing. Seriously, these days, I think you cant go past AI. It's like having an expert next to you. You will need to figure out what address the file is visible to the processor in the PCM at. Probably it'll be 0. Just load right at the top. Then you need to know what CPU it is. probably MPC555 big endian. You can suggest this might be the case to an AI and it'll look at the bin and tell you if the opcodes look right. Then you'll need r2 and r13. So you need to find the init code and somewhere reasonably early in the setup of the PCM you'll see values get moved to these registers. That is those values. I am more of an ida user but I have been playing with MCP servers lately, and its gold. Ghidra will be same concept but different. Once you've picked your AI install its tool locally. Then tell it what you are trying to do and ask for guidance to set up an MCP connection to Ghidra. Work with the AI on that until it says it can see Ghidra and your bin. Then you can probably start asking it things like what R2 and R13 need to be set too, and it'll probably be able to find out. And for learning, expand the 'thinking' process and read what its doing. Its a goldmine of information. If you still dont get it, ask questions as you go. You will have a million questions, and ask them all, Go until your learnings are falling out as soon as they're going in and your eyes are falling out of your head. Then get some sleep and do it all again. Wash rinse and repeat, and you'll never stop learning, and the tools and methods will keep improving.

[Gatecrasher]

The first couple things you're going to need to do are going to be:

Get the MPC562 reference manual from NXP. It's easily available.
Figure out, with certainty, how big the flash is, and where it fits in the processor memory map.
Figure out how complete your converted HPT file is. If it's missing segments it's going to be a bitch to load into Ghidra.

The very first thing you do in Ghidra when you create a project is select the processor language, and set the loading address. You're going to need to know exactly where everything is in order for your disassembly and XDF to make any sense. Before you even start Ghidra, make sure you know how the flash is laid out. Bootloader, OS, calibration segments. Universal Patcher can probably help with sanity checking a lot of this.

[gmtech825]

mcp with ghidra is amazing, I wish I had it years ago. Usually my very first starting point to mapping things is the operating system part number value in the file header. I search references to it and that will help me get to the functions that handle the mode 1a requests. from there you can find the main function that handles all mode requests, So you can locate the PID function pointers and that will lead you to all the PID values in ram etc. Then you can define things like rpm, vss, spark etc.

Happy Hunting!

[hjtrbo]

if you can include a hpt file of the os you're working on, some sanity checking of your bin offset & sda registers can take place.

[Gatecrasher]

I glanced at the bin file he attached to his post and I didn't see the usual segment headers. But I'm not very familiar with this ECU.

[hjtrbo]

Tangent question but relevant to the thread, is there a benefit to running ghidra over a mcp server versus using its built in bridge?

[hjtrbo]

Ghidra Bridge vs. an MCP server: what's the actual difference?

These get talked about as if they're competing ways to do the same thing. They're not really. They're built for different jobs, and which one is "better" depends entirely on what you're doing.

1. Full arbitrary API vs. a curated tool menu

Ghidra Bridge (ghidra_bridge/jfx_bridge) is a transparent RPC proxy. A small server runs inside Ghidra's Python interpreter, and your external Python gets proxy objects for the entire Ghidra API. You write normal Python that behaves as if it's running inside Ghidra, with access to everything a Ghidra script could touch. If you can do it in the Script Manager, you can do it over the bridge.

An MCP server (GhidraMCP and similar) exposes a fixed catalog of high-level operations as tools: list functions, decompile, rename, get xrefs, set a comment, and so on. It's designed so an LLM agent can call those operations directly. You get a clean, named menu instead of the raw API, but you only get what the server author chose to expose. Anything outside that menu, you can't reach without extending the server.

So: the bridge is unlimited but you do the wiring yourself; the MCP server is convenient but bounded.

2. The cost model is completely different, and this is the part people underestimate

With the bridge, the unit of work is a script. You write a loop and run it. Want to touch 20,000 functions? That's one script, one execution, and you can push the loop server-side so you're not even paying network latency per item. The model (or you) pays once to write it, and then it runs at machine speed over as much data as you like.

With an MCP server, the unit of work is a single tool call, and every tool call is a full model turn. That's the catch. Renaming one function is one turn. Renaming a thousand functions is a thousand turns, each one a round-trip through the LLM, each one burning tokens and wall-clock time. There is no "loop" an agent can run cheaply, because the loop body is the expensive thing. The cost scales linearly with the number of operations, in the most expensive currency you have.

So the MCP model is excellent for a handful of precise actions per turn: "decompile this, rename it, follow the xrefs." It falls apart the moment the work is measured in thousands of operations. The bridge collapses that same work into one paid turn plus a fast machine-speed loop.

The holy grail: an MCP server that exposes the bridge

Here's the thing though. These two are not actually opposed, and you do not have to pick. The ideal setup is a thin MCP server that wraps Ghidra Bridge and exposes one tool: run arbitrary Python against the live program. That single design unifies everything good about both sides.

You keep the clean agentic front end: the model calls a tool directly, no separate "write a script, run it, parse the output" dance. But the body of that tool is unrestricted bridge code, so you also keep the full API and the cheap batch path. The agent decides what to do in one turn, then ships a loop that runs at machine speed over twenty thousand items inside that same single turn. One tool call, unlimited work behind it.

That is the best of both: the convenience and directness of MCP on top, the unbounded reach and per-operation cost of effectively zero from the bridge underneath. A fixed-menu MCP server forces you to choose between flexibility and tidiness; a bridge-backed one refuses the choice. If you are building or picking a Ghidra MCP server, that is the design to aim for.

Bottom line

Fixed-catalog MCP server: great for light interactive RE, painful and expensive for bulk. Raw bridge: unbeatable for batch and custom logic, a bit more boilerplate for one-off questions. An MCP server that exposes the bridge: you stop having to choose.

[Lucasperks06]

thanks for all the replies guys really appreciate it
first off antus what AI would you reccommend, when i started out map finding and learning i tried using chatgpt, but i just dont trust it at all, it seems to act so confident in what its saying when its completly wrong, and ive asked it to find maps or explain how they work and its just all wrong most of the time, ive tried to stay away from it but 100% if theres a good one out there youve found id be happy to try and use it. and yeah there will probably be alot of questions and headaches hahaha.

ill post the files below of the reference manual and anything else ive found. so based off what ive found, the mpc562 dosent use a 512kb flash, only 563/564. im assuming this is the extra .5mb that ive heard people talking about. whats it used for? and to determine how big my flash is supposed to be, how would i go about that. the only thing ive found is the memory map for mpc562 but adding up everything thats shown dosent come close to the 2mb.
and with the processor language, ive been hearing different things on which to go with, should i go with "MPC8270" or the default 32bit big endian.
and with regards to offsets of the bin, one thing that is a bit weird, is the bin is offset -20000 to the HPT file, and its every bin with this SW number. but any other e77 or e55 bin matches up perfect with the HPT file. im assuming that will potentially help.
and with knowing how the flash is laid out, what is this used for? im guessing youll make note of where everything is laid out in ghidra to make it more understandable. and for figuring out where everything is like the bootloader, OS and Cal, would i find that in the files i posted below? i cant seem to find anything other then "CALRAM".
ill upload the stock bin too
thanks heaps
https://www.nxp.com/docs/en/data-sheet/MPC561RM.pdf

MPC500_MEMORY_MAP.pdf

mpc561-4_mot.pdf

Screenshot 2026-06-13 105850.png

Screenshot 2026-06-13 110302.png

Screenshot 2026-06-13 110329.png

[hjtrbo]

Code: Select all

From universal patcher:
 OS          PN:  52PJMS1022                  [0000 - 0000], Size: 1
 OS-1        PN:  12628463           , Nr:   1[20000 - 1BFFFF, 1F0000 - 1FDFFF], Size: 1AE000
 EngineOper  PN:  92253439           , Nr:   2[1C2000 - 1ECF27], Size: 2AF28
 System      PN:  92253603           , Nr:   3[1ECF28 - 1EEF17], Size: 1FF0
 Speedo      PN:  92234006           , Nr:   4[1EEF18 - 1EFFFF], Size: 10E8

https://github.com/joukoy/UniversalPatcher