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- Subject: Re: About ROMable Lua
- From: KHMan <keinhong@...>
- Date: Thu, 15 Jan 2009 01:59:55 +0800
I was wondering:
how hard it woud be to run Lua functions whose bytecode is stored in
Flash (possibly in a preprocessed form)?
Bogdan, have you considered this?
Looking up bytecode from ROM should be no problem in theory, since
bytecode is never written to during VM execution, but some
modifications to Lua might be necessary.
For single-chip-solution Flash microcontrollers these days, often
you can reprogram the program Flash on-the-fly, but programming is
slow and it's by blocks. So you can interpret some Lua source and
write the bytecode to ROM, but it's slow compared to using
internal RAM and the program Flash is not designed for a huge
number of writes. In theory, you can even do JIT on such
Primarily, the problem is that program Flash is not designed for a
whole lot of writes. A typical Microchip PIC24 datasheet says Ep
(cell endurance) is 100 minimum, 1000 typical, E/W (erase/write)
cycles. This is okay for firmware updates, but not for daily use.
EEPROMs would be better, but it would have to be connected as an
Kein-Hong Man (esq.)
Kuala Lumpur, Malaysia