Re: Booting MPC565 by CAN/RS-232?

Hello Vijay,

I saw the other responses, and I don't think they mention that you
don't need to write your own flash driver. There is a flash driver
available from Motorola (free), and you should use this one. Do not
try to write your own. Motorola calls its driver the General Market
Driver (GMD). To find it, do a Google search on "MPC565 General Market
Driver". I have used this driver for the MPC555, and while I'm not
sure that I would say that using it is "straightforward", it is very
well documented.

It is a little confusing to move code to RAM and run it from there if
you've never done it before. Rather than jump all the way to uploading
code to your board via RS-232 or CAN, I recommend that you first
incorporate the GMD into your code and get to the point where you
understand how to move the driver into RAM and run it from there. The
examples you get from Motorola simply write a test pattern into
internal flash. If you have a BDM or NEXUS debugging connection, you
can confirm that your code has actually written to flash using your
debugger. I recommend that you do NOT write to the shadow flash until
you are sure that you can write correctly to the main flash array. If
you write the wrong value to the RCW in shadow flash, you can get into
a state where your debugger won't work. How do I know this? Because
I've done it, of course.

Good luck.

Joe 


--- In [email protected], "vijayanandl" <vijayanandl@y...> wrote:
> Hi All,
>       I have a question regarding programming the internal flash. In my 
> current implementation I have programmed the MPC565 internal flash 
> using the JTAG interface. We have a working system now and to expand 
> its functions, now I am interested to program the internal flash using 
> the RS-232/CAN interface if possible. The question is I am currently 
> using the standard initialization, with program executing from internal 
> flash and I do not use an RTOS(its a bareboard) my environment is 
> Codewarrior and BDI. So what are the steps I need to take to achieve 
> this capability using RS-232/CAN interface? 
> Do I need to modify my initialization files, flash driver etc. Advice 
> in this regard will be really helpful. Thanks in advance.
> 
> Regards
> Vijay




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