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Yes please.

Download a new image into flash. Then reset the chip (usually a FW command). Then the boot rom reads the image and puts it in sram. Then it copies the key from Otp to the crypto HW and start the crypto HW. If the image Checks out, it jumps to it. If not, it repeats using the old image in...

I don’t know that I would call what gets put in Otp (one time programmable ) memory as “public”. When that secret is known, you can create new FW that the chip will run. It’s different than a public/private key sceeem that is used to pass a session key. It’s more like the session key. It is...

I think these ota update cars are a new level of security. Not in the security technology, but in the shear volume of secrets that must be hacked to do 3rd party development. Not sure it will be anything like ice car curve for 3rd party development we are used to. It’s going to be interesting.

What we do in the controllers is put the FW hash residual in an immutable register that anyone can see. That is how the version and signing can be verified by a central authority. Is that what you mean by key id? agree.

Congrats! It’s a heavy car. I was used to a boxster. So much heavier and longer than my old car. Getting used to it. I still love it. Love the steering feel on the rwd. Not as numb as the 4s.

Excellent. We haven’t bored the pants off everybody! These are certs that bind the various optional SW pieces to the root of trust cert in the pcm. We were talking about the many other root of trust certs that we think exist in other processors in the car. One in each of those sealed boxes...

This has been really interesting. I build network controllers and it self certifies the code. It’s a fair amount of HW and technology to do it. I never really thought about the ramifications of doing it in a system this big. how many mutable code processing systems do you think a Taycan has?

Agree. But in peripherals. Which is pretty much the whole car, the certs are distributed. It’s the only what you can boot a car in under a second. If it is a big tree, it takes too long to boot.

Yikes. That’s a car killing price.

Yes that would be great! But I don’t think the Taycan Is quite that organized.

This is where I am m coming from.

I don’t know about 3rd party being able to change the battery type. Porsche yes, 3rd party no. The problem is the security you have to build into such an electronics heavy car. To do over the air updates, you need to use a technology called “secure boot” on your embedded processors. This...

The 2nd board was a custom dummy board that brought the raw battery signals to a connector. Probably bridges to a bigger controller to twiddle with the battery directly.

It scraped my bumper and I had to get it spayed. Major bummer.

Looks like they are trying to repurpose the battery module. The bypass that little board so they can control the battery on their own?

You guys all know about hitting a ramp or dip at an angle to keep from scraping. Right? There were low cars long before gps and adjustable air suspension. That’s how they survive.

Vertical things have not been a problem. Horizontal things like my daughters car, have been a problem. Turns out the Taycan is a bit more square than a boxster.

Probably. ?. Just trying to understand time to cost curve and how an ice Porsche might compare to an ev Porsche. so far I think it might be similar assuming similar maturity on the technology. But the maturity is not the same. The big question is how long will it take For independent ev...

This is my point on dealership vs non dealership service. Non dealership ev service has to become a thing. It has to happen. There is money to be made there by a non porsche shop. My experience with third party shops is that the good ones are very resourceful.