[Diy_efi] new EFI controller

[Perry Harrington]

On Tue, Mar 11, 2003 at 06:48:30PM +1300, Bevan Weiss wrote:
> I don't think I'd want to run a full fledged linux kernel on it, especially
> with the added execution cost of real time scheduling.

I wouldn't run the *entire* kernel on it.  I'd strip it down to the IO, VM,
and scheduler.  The upside is there are already tools for the PPC and you
could write an emulator which allows you to develop the software on Linux.

The kernel would provide IRQ distribution, serial IO, and IO to onboard devices
via drivers.  The major upside is that you don't end up writing your own
multitasking kernel for the ECU, and a lot of the basic management is handled
for you.

> I agree that the cost of the MPC565 isn't ideal, especially in low volumes.
> However the level on integration removes any extra costs that would
> otherwise be required.  All that's really left for the hardware design is
> connecting up some filtering components and some protection for the inputs.
> Outputs just require the driver hardware to be sorted, which shouldn't cost
> much.  It should easily come in under $500 for the entire unit.

Maybe.  From what I've seen, the more expensive and complex a chip is, the more
support hardware and special board routing is required.  Not to mention a lot
of startup code just to get the thing to the point of talking to the outside.

--Perry

-- 
Perry Harrington			Data Acquisition & Instrumentation, Inc	
perry at dainst dot com					 http://www.dainst.com/

Those who would give up essential liberty to purchase a little temporary safety
deserve neither liberty or safety. Nor, are they likely to end up with either.
                             -- Benjamin Franklin

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