That would be great!
You mean read the whole information on the emmc before it's replaced?
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Preventive eMMC replacement on MCU1
- Thread starter widodh
- Start date
That would be great!
You mean read the whole information on the emmc before it's replaced?
LuckyLuke
Model S P90DL
Yes, reading the emmc can be done without any permanent hardware modifications or soldering.
Needs a complete disassembly of the mcu though (the main pcb has to be taken out of the cage), and power from a 12V source.
Needs a complete disassembly of the mcu though (the main pcb has to be taken out of the cage), and power from a 12V source.
.jg.
Member
This implies that it is not possible to copy the partitions "on the fly", with the MCU still in the car - is that correct?
LuckyLuke
Model S P90DL
Correct.
You could in theory perform a small hardware mod to be able to do it while still in the car though, but you'd have to take out the mcu and disassemble it to do that mod.
You could in theory perform a small hardware mod to be able to do it while still in the car though, but you'd have to take out the mcu and disassemble it to do that mod.
⚡️ELECTROMAN⚡️
Village Idiot
I would imagine, in theory, every device that ran with solid state memory that requires write-cycles would have this problem. The issue becomes, will the user, of any device, ever reach that threshold of write-cycles where the memory chips can't keep up/can't remap/run out of over provisioning.
You can prevent the car from sleeping. Things like running Sentry mode, or setting TeslaFi to not let the car sleep would keep the MCU awake and wearing the eMMC.
Of course it could backfire and your acceleration causes it to wear out right after the warranty expires where if you had left it alone it would have lasted longer... (Depends on the age of your car/MCU and how it has been used to date.)
How can TeslaFi be setup to not let the car sleep?
It has the ability to set a single schedule but not a repeating one. How often does the car need to be woken up?
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It’s in settings where you can set the polling interval.
teslafi will occasionally (when idle) stop polling the car for 15 minutes. This time allows the car to sleep.
just turn that off.
I’ll look it up later and get the exact option.
I didn't find that option but I did find the option to enable "TeslaFi Sleep Mode" under "Settings/Sleep Modes" menu.
If you know of a polling interval option please post.
Should just be able to disable sleep mode.
personally, I wouldn’t do it as there is no guarantee when the failure would happen. And it wastes electricity.
could also enable sentry mode everywhere.
I think that's the answer. Turns out I've had sleep mode disabled for the last two years!
Might look at the raw data feed and see if the car is sleeping - just for fun.
I guess it also just shows in the day view. Mine sleeps for an hour or two, wakes up for a few min, then goes back to sleep. Unless it's in the sun on a very hot day.
Checking the data it appears my car is an insomniac!
Too bad there's no way to see the health of the eMMC.
Are other eMMC parts better at reporting health status?
The Samsung Magician software installs on computers with Samsung SSD's installed and keeps track of total byte writes. I believe it then tracks that number against the MTBF (mean time between failures) for the NAND chips and/or the drive itself in general, to give you a predictive health of the drive as time goes on. More writes = less health
IIRC the Hynix part doesn't report enough info to make any sort of determination of its health. Not 100% sure though.
I have teslafi polling my car every minute and I think mine wore out within the first year and a half of having the car requiring an MCU replacement.
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