Lpc2000

> Just a quick untested idea: I wonder if instead of implementing 
your own 
> bootloader because P0.14 is physically inaccessible, you could 
force it 
> to enter the built in bootloader on the next reboot by corrupting 
the 
> vector table checksum word? Of course it will then be completely 
> unbootable until the flash is reprogrammed so you want to be 
careful 
> that you only do it when you're sure the user wants to reprogram 
the device.

That'll be risky business indeed. Luckily, the built-in IAP flash 
programmer can program anywhere except the bootloader sector. I think 
if you corrupt reset table the mcu will be totally useless on 
reset...not even the bootloader will run. 

I'm attempting to implement something similar to your idea but 
instead of rewriting vector tables/chksum every time, use a 
modifiable patch table containing addresses to the various 
functions...as someone mentioned a few weeks ago.

Flash Updating is a fun trick for new ppl like me to master but hey. 
Flash-write routines, and C/assembly code are the only tools I needed.