Re: Booting MPC565 by CAN/RS-232?

Hi Joe, Baruch, David,
                    Thanks for all your responses. It was very 
helpful and informative for me. I will follow Joe's suggestion and 
incorporate the GMD in my code. Once I am confident with moving to 
the RAM and flashing the code, I guess I will then proceed with the 
RS-232/CAN loader development like Baruch suggested. Will let you all 
know about my results!!
Have a nice weekend guys!
Vijay


--- In [email protected], Baruch Einziger <baruch_e1@y...> wrote:
>
> Hello Vijay
> 
> The boot loader receives the reset signal and check if an 
application is burn into the internal flash. The shadow Ram are 
burning with the boot program before the first application program 
transfer to the mpc5xx. We are also re map and reduce the size of the 
interrupt table.  If the boot finds a good application it's re map 
the vector table and jump to the beginning of the application via the 
new interrupt table (address 0x8000). 
> 
> If there is no application the boot copy the loader program with 
the flash driver or RS232 or Can driver to the internal ram and jump 
to the entry point of the loader program. The loader program erases 
all the program blocks and receives and program line after line of 
the S19 file of the new program. 
> 
> After the flash programing we are waiting to the next power up. 
> 
> 
> trailrunner23 <joep@f...> wrote:
> 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 
> 
>





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