> > > > One other small ROM that will check the Flash ROM's checksum and/or a jumper
> > > > on the board, and if it fails beep a tune on the speaker, and then expect a
> > > > raw Flash ROM image sent to it on the first serial port?
> > >
> > > Many flash chips have a separatly write-protectable area used for boot
> > > areas.
> >
> > I know. Is it large enough?
>
> AMD 29F040 flash chips (512KB) are divided into 64KB sectors that can be
> individually erased. For the cards I've worked on, we keep a fixed boot
> loader in one sector, and the actual firmware is kept in the remain 7.
> Combined with compression, quite a bit of code can be squeezed onto a
> single flash.
Now, this sounds very nice indeed. The selective-erase makes it ideal for
the purpose. I think a 1 or 2 meg part would be better, though.
Vojtech
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