Lpc2000

> Why is this tricky? Buffer four 128 byte blocks to get a 512 
> byte block. The only times you fail totally is if you do not 
> implement retries on a block error or the link fails 
> permanently. The ISP loader is then your saviour. If you can 
> afford to buffer all 8kb, then you have an extra level of 
> safety. The code we load into RAM to do this is about 3kb, uses 
> a few hundred bytes of RAM for stacks and so on, so even the 
> smallest LPC has 12k of RAM for buffering.
> 
> If you have a lot of RAM data you need to preserve, why not put 
> in spare Flash, perform the load, and restore the RAM?
> 
> As a caution, I suspect but have no proof that most Flash write 
> failures are down to poor power supplies.
> 

Fair enough...using multiple blocks is worth trying out then. With 
16k RAM buffering wouldn't be a problem at all. The ISP on my system 
is available only for the 1st load because of the hardware setup I 
got enclosed case & P0.14 as an LED driver). I'll have to get around 
ISPs with IAP routines for future downloads.

Thanks for the caution. 
Leighton