> -----Original Message-----
> From: piclist-bounces@mit.edu [mailto:piclist-bounces@mit.edu] On
Behalf
> Of Wouter van Ooijen
> Sent: 06 May 2008 20:20
> To: Microcontroller discussion list - Public.
> Subject: Re: [PIC] another bootloader question
> 
> > The bootloader I developed for use in a product is always run at
power
> > up, and checksums the main program image (which is always a fixed
size).
> > If the image is ok, it jumps to the entry point
> 
> So how do you re-bootload once Murphy has succeeded in bootloading an
> image (with correct checksum) that refuses to bootload?

The bootloader is only for the convenience of our customers, so any
firmware images will be thoroughly tested before being released.  In the
lab or production facility we use a JTAG interface to program the
devices.

The products have no user interface, e.g. buttons etc. so checking for
this kind of input is difficult.  The latest project has enough spare
pins on the main interface that we can use a separate serial interface
for bootloading and test another pin to enable it, but this is very much
an exception as we rarely have spare pins on the modules connector
(which is usually defined by a multi-source agreement and therefore
can't be changed).

Regards

Mike

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