Prius MFD Operating System

[momanz]

<div class='quotetop'>QUOTE(pkhoury @ Nov 4 2007, 02:03 AM) [snapback]534560[/snapback]</div>

And this is for which year? I once copied the PCMCIA Type III hard drive for a Toyota Sienna
Nav system while I was in the shuttle van, and the files appeared to be DOS based.

Anything with /dev is definitely UNIX based. It sounds like Linux, but I'm a Solaris kinda guy.

But back on topic - has anyone here actually taken apart the ECU? I'm seriously curious in addition to OS what kind of CPU, RAM, etc is in there. Considering that the Prius is esentially a computer on wheels.

Paul
[/b]

Here's an article on the tear-down of various hardware components in the Prius. I'd like to get a closer look at the boards in the MFD anyone have any closeups?

-m

[pkhoury]

<div class='quotetop'>QUOTE(momanz @ Nov 4 2007, 08:55 PM) [snapback]534822[/snapback]</div>

Here's an article on the tear-down of various hardware components in the Prius. I'd like to get a closer look at the boards in the MFD anyone have any closeups?

-m
[/b]

This is definitely informative. Okay, so we have two PCB's with CPU's. And they mention 16MB of FLASH and 64MB of RAM. I'm thinking maybe a realtime OS like QNX or VxWorks, or the ITRON OS as specified above, in order to fit in 16MB (maybe slightly compressed, since you figure when you start the car, and you have the Toyota logo screen, that's when it's boot strapping).

Now I wonder if you could technically add bluetooth functionality if you just added the bluetooth board (and if the microphone is already built in).

[AnailizeR]

Well .. I am always up to spreading "muy love" open ... after I go for my 4000 mile oil change probably this weekend .. i will do some work .. which reminds me .. never got around to posting my dash board pics ... damn work sucks...

[pkhoury]

After doing some research for something else, this seems to suggest that my prognosis might be correct:

http://www.qnx.com/style/_swf/automotive/q...tomotive_v4.swf

It takes a while for the list to scroll, but very likely the Prius uses QNX (per the above thread that says the nav DVD uses a unix FS).

Paul

[hobbit]

It will undoubtedly be some embedded system pared down to do the
tasks it does without general-purpose OS fluff, likely built around
one of the development systems / kernels mentioned. I hadn't seen
this thread yet but you can certainly get a look at how the MFD is
constructed in the page I put together last week. I've also jotted
down some chip numbers [which you probably can't see from the pix]
and was going to try looking some of them up, but I think we'll find
that it's a lot of proprietary stuff or fpgas and uCs whose
programming you don't have a copy of. No, this probably doesn't
help much.
.
_H*

[Bill Merchant]

I think the Prius isn't a computer on wheels, it's a cluster of computers on wheels, connected by three LANs. For highest reliability, specific tasks, such as braking, are controlled by embedded RT controllers. They talk to each other, of course, since various functions interrelate.

[RonH]

Another possibility no one's mentioned is that there is no OS. Embedded systems with hard realtime constraints like, say, the ABS system, can't afford to let an operating system kernel fool around with scheduling and priority and what not. The boostrap loads the application which runs a single loop with polling I/O and a watch dog timer to reboot if something goes wrong. Keep it simple and keep control.

[Bill Merchant]

Didn't I say that?

[pkhoury]

<div class='quotetop'>QUOTE(Bill Merchant @ Nov 25 2007, 11:12 PM) [snapback]544171[/snapback]</div>

Didn't I say that?
[/b]

Still makes me wonder. I know QNX does tasks like embedded controllers for nuclear power plants, and 911 call centers. Ya never know.

The people who took the whole car apart (too tired to remember if I posted the link or not) said
that there is a decent amount of RAM on some of the boards (I think 64 or 96MB of flash), so you figure it has something in there.

I noticed also a soldered Lithium button cell. I wonder what happens when it goes out? I know the life expectency of those things are only about 5-8 years.

Paul

[patsparks]

<div class='quotetop'>QUOTE(RonH @ Nov 26 2007, 04:06 PM) [snapback]544161[/snapback]</div>

Another possibility no one's mentioned is that there is no OS. Embedded systems with hard realtime constraints like, say, the ABS system, can't afford to let an operating system kernel fool around with scheduling and priority and what not. The boostrap loads the application which runs a single loop with polling I/O and a watch dog timer to reboot if something goes wrong. Keep it simple and keep control.
[/b]

That's just what I was about to say.


Sorry I'm lost in the geek world (said in the nicest way)