> Yeah, this is really basic stuff. =A0What kind of idiot relies on Hyperte=
rm to
> upload code anyway!? =A0That also means this guy did a bootloader without=
 a
> checksum. =A0Duh! =A0I've done a lot of bootloaders, but I never once eve=
n
> considered leaving out the checksum. =A0Even if you think the communicati=
ons
> channel is fine, what if power gets interrupted in the middle of a upload=
,
> the line gets disconnected, the user kills the program, or any of a numbe=
r
> of sufficiently possible things that could cause a bad uploaded image?

I think you are over-reacting. The checksum and the self-check code
could be included into the uploaded image as microcontroller's extra
memory is not a problem now. The self-check code would run each time
the microcontroller is powered on. All the potentially dangerous
initializations would be done only after the self-check is ok.
Probably not as reliable as for the bootloader with a checksum in some
cases, but still should work well for most.

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