Re: CAN bus netboot

[Thomas Wuensche <wuensche@ems-wuensche.com>]

markus@infoscape.com wrote:
> 
> Antonio Latorre writes:
>  > I am a newbie to this newsgroup, so I beg your pardon if I am asking
>  > something stupid or out of the topic, but here it goes:
>  > Do you know if there is a way (f possible multiboot compliant) to boot a
>  > diskless PC through a bus CAN board?. Is there any code or pointer I can
>  > look out?. Is there anybody out there who have done this?
> 
> I am not aware of any software that does this, but there is no good
> reason why you shouldn't be able to write an adapter for etherboot to
> allow booting from a CAN bus. More interesting is the question of
> which protocol you are going to use. I have never programmed any CAN
> applications and you should probably take everything I say with a
> grain of salt, but to the best of my knowledge the CAN bus does not
> natively support IP protocols. You might be able to encapsulate IP
> within CAN frames (who knows, there might even be a standard for doing
> this), though there might be a limitation on the MTU, which would
> impose some severe overhead on the protocol. You will probably also
> have to implement a new IP-on-CAN network driver for your server. What
> is the transfer speed of CAN nowadays?

I'm also not aware of a ready application to do this with CAN, however
I know that TCP/IP protocol stacks have been based upon CAN.

But here some basic information:
- Protocol for realtime exchange in critical applications
  (like engine management in cars)
- Excellent latencies (max ~130us at max. bus speed)
- Data length up to 8 bytes/telegram
- Extensive error detection and correction
- Used in multi-million volume (new cars may have >30 nodes)
- Maximum speed 1MBit/s at short distances

Best regards,

Thomas Wuensche

> Markus
> 
> --
> Markus Gutschke                         Internet: markus@infoscape.com
> Infoscape, Inc                          Phone:    +1-415-544-4762
> 100 Broadway, 2nd floor
> San Francisco, CA 94111
> 
> Disclaimer: The above message represents my personal opinion; It does
>             not constitute an offical statement by Infoscape!
> 
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