pcmhacking.net

Yeah, I don't have strong C# skills haha. I do feel like I could make it work, but I'm going to have to jump onto some C# coding classes as I only know what I've read in the PcmHacks repo and creating a simple web app to upload my kernel via J2534.

Now that you say all that I'd be willing to try to help (even though I might not be much help for a while) abstract the comms. I feel like if that was done there is a lot of ground work laid already that wouldn't have to be recreated.

I am keen to get these assembly kernels finished for pcmhammer first, get the OSID lists for P04 and P08 and any others in to a good state, then we'll probably be able to do a release and start thinking about what comes next. If you want to start looking at can bus before then feel free to start a new thread and ask here, or send me PMs and we can get started on another branch. I have this E92 and an E38 on the bench I can develop and test against.

my coding skills are limited but I can usually figure things out eventually. I've been able to successfully create simple programs to talk back and forth with CAN modules. I feel like I do have a pretty good handle on CAN programming and Im willing to help out where I can. I have a pile of CAN ECMS under my bench as well.

antus wrote:I am keen to get these assembly kernels finished for pcmhammer first, get the OSID lists for P04 and P08 and any others in to a good state, then we'll probably be able to do a release and start thinking about what comes next. If you want to start looking at can bus before then feel free to start a new thread and ask here, or send me PMs and we can get started on another branch. I have this E92 and an E38 on the bench I can develop and test against.

Ok, that’s reasonable. I’ll start a new thread for this effort in the GM section.

Ok, so I've created a branch of PCM Hammer that can communicate with CAN ECU's (Discussion on that Here) and I was able to upload my kernel and read the ECU for the first time.

The kernel seems to be working quite good, but I've only tried it a few times so there could still be problems. I had a couple issues with it crashing the ECU part way through the reading, but I was able to figure it out.

I have some cleanup that I need to do with the kernel. I would like to try and move onto the flash programming, but I know that the CRC, checksum, or whatever is in this ECU will stop me in my tracks. This is the only ECU I have at the moment so I would like to keep it alive, so I'll start researching what needs to be done so that I don't brick it.

Ideally I would be able to find a way to recover it from a software brick of some sort, but I imagine I would have to solder to that board for that.

I can and I'm sure others can give it a try on a bench E92.. For writing I am using the factory sps format and the aftermarket's appear to be doing the same.. In any case if your writing your own I would stick to doing something in the calibration section as if it does get bricked it can get fixed with gm sps or other software..

Hiya,
bubba and others here are bad tha fack ass. I used to write some pretty cool stuff in asm, but back in the day it was 8 bit(two way comm so I had to build cloak code) I believe it will still transfer. Yes, somewhere in the GM strategy it checks CVN's and other such things. The newer stuff is quite interesting. I haven't had any time to do much research and I suck. If I get into something like this, I tend to not sleep and not work on anything else until I completely understand Not conducive for life fun .
The newer stuff seems to have entry's upon boot that has a different security sector and has its own stack and separate "secure" ram.

In-Tech wrote: The newer stuff seems to have entry's upon boot that has a different security sector and has its own stack and separate "secure" ram.

Interesting. Do you have any more information about any of that?

Hiya bubba,
At this point I monitored vpp against known stuff I monitored on the E92's I have read. I noticed there is quite a bit of activity on vpp and nothing on the "speaker" CAN with the newer stuff.

vpp can "show" you read and writes. It's a tough road.

20+ years ago in my iso7816 days, there were plenty of things I thought GM/Hughes were going to implement, and vi hola. (<<<<<mis-spelled on purpose for funny) in 2019+ they are doing it.

What is vpp?

I believe there was something on the the P01/P59 that related to flashing but I don't know if it's the same thing. Also I think it was only accessible from the PCB.