How much onboard memory is installed (RAM and disk/SSD) ?

[JJR]

Does anyone know how much onboard memory is installed in an MME, both RAM and disk/SSD? Just curious.

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[bshaw]

Um, its not like your PC where if you can just find a way in there, you would see traditional memory and storage stuck behind the big screen.

There are dozens of interconnected modules probably some with their own storage, and some without.

Someone with more knowledge than me can probably provide more details, but there isn't an answer to your question the way you've worded it.

 

[daemonic3]

I'm also curious where the OP is going with this. Every module that has its on processor or microcontroller is going to need a combination of volatile (RAM) and non-volatile (ROM or Flash) storage, and it isn't accessible to the user.

Lets say the head unit has 64GB of RAM. What would anyone do with that information?

 

[bncwhite]

Perhaps the OP is thinking about how slow the boot time is when starting the car? Sometimes it seems like almost a minute before mine finishes loading all the screen options.

 

[DevSecOps]

The MME uses a NXP i.MX 8 Series processor (I think it's the NXP S32G2) which resides in the APIM running QNX (as of 09/25/22).

The specs sheet calls for 8mb of RAM and I think I saw somewhere that it's like 64GB of eMMC storage but I'm honestly not sure.

 

[bshaw]

Perhaps the OP is thinking about how slow the boot time is when starting the car? Sometimes it seems like almost a minute before mine finishes loading all the screen options.

Uh, that seems really long. Can you be more specific about the screen options that are delayed?
My sync screen is available pretty much immediately after pressing the start button. Or if some detail is not on the screen yet, I don't notice and start driving immediately anyways.

Disclaimer -- I don't have CarPlay or AA starting up, so maybe that's taking extra time on your car. If so, I wouldn't call that "booting" as much as Sync negotiating a connection with your phone for wireless app projection. Still ~1 min is way too long, even for that.

 

[Jonno21]

The MME uses a NXP i.MX 8 Series processor (I think it's the NXP S32G2) which resides in the APIM running QNX (as of 09/25/22).

The specs sheet calls for 8mb of RAM and I think I saw somewhere that it's like 64GB of eMMC storage but I'm honestly not sure.

Didn't Tesla have eMMC failures? ? I hope history doesn't repeat itself with the MME.

 

[DevSecOps]

Didn't Tesla have eMMC failures? ? I hope history doesn't repeat itself with the MME.

Anything can fail. Tons of devices have embedded storage.

 

[Jonno21]

Anything can fail. Tons of devices have embedded storage.

Yes you're right. We are driving computers on wheels nowadays with all the advantages/disadvantages that entails.

 

[HSVMWCS]

Yes you're right. We are driving computers on wheels nowadays with all the advantages/disadvantages that entails.

Indeed, my MME entered "turtle mode" on August 17 and has been out-of-service since then. Yesterday I received its "Connected Vehicle Status" report and was shocked that all problems occurred on July 28. In other words, my MME detected those problems three weeks before its complete malfunction. I just wish I had been notified before August 17.

 

[bncwhite]

Uh, that seems really long. Can you be more specific about the screen options that are delayed?
My sync screen is available pretty much immediately after pressing the start button. Or if some detail is not on the screen yet, I don't notice and start driving immediately anyways.

Disclaimer -- I don't have CarPlay or AA starting up, so maybe that's taking extra time on your car. If so, I wouldn't call that "booting" as much as Sync negotiating a connection with your phone for wireless app projection. Still ~1 min is way too long, even for that.

A minute might be an exaggeration. It’s probably close to 30 seconds. I can back out of my garage turning to the left, put it in drive and turn to the right, and then drive forward off the driveway and into the street and start accelerating before the center panel finishes loading all the controls.

I do use Wireless CarPlay so maybe that slows everything down.

 

[dj_stang]

Anything can fail. Tons of devices have embedded storage.

The difference for Tesla is its all more or less a single computer controlling everything. Whereas we have dozens of individual chips and modules, many coming from other vehicles that Ford makes. Open Forscan one day and you’ll see more than 30 individual modules that can be flashed or configured.

I’m sure having it all in one is more expensive to replace, but maybe less prone to failure. Whereas having it all modularized means maybe its more likely for something to fail but the rest of the car can continue to function, and replacement should be cheap/easy.

 

[JJR]

I'm also curious where the OP is going with this. Every module that has its on processor or microcontroller is going to need a combination of volatile (RAM) and non-volatile (ROM or Flash) storage, and it isn't accessible to the user.

Lets say the head unit has 64GB of RAM. What would anyone do with that information?

I was wondering how much wiggle room there is for additional software functions.
I'd like to see a scenario feature where screen selections could be saved and executed by selecting the scenario.

 

[bshaw]

Check out the threads on this site related to forscan. That’s how you could possibly modify the vehicle software to do a few small changes. Forscan is not so much adding anything, as it is making configuration changes to existing settings.

May not be what you’re looking for, but I don’t think there is any other options for owners to make their own software changes.

 

[Goober96]

It’s running a Gateway 2000 PC with an Intel 486 processor and a 30 GB hard drive with 4 MB of RAM running Windows 95.

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