Re: Green Hiils AdaMULTI 2000 -> Motorola Coldfire

["Martin Dowie" <martin.dowie@gecm.com>]

Mark,

I don't know if the problems are still current, but here is a snippet
from a conversion report to GH AdaMULTI (but targetted at PPC):

"The first problem we hit was where the ADA'83 code used types with
16 bit representation clauses to access 16 bit off board registers. In
ADA'83 reading and writing to variables of these types compiled to
a single access and the code worked fine. In GH ADA'95, however,
the code was compiled into two byte accesses. This often had the effect
of generating a bus error as some of the addresses in question cannot
physically be accessed as 8 bits."

Some may argue that it was sloppy for the original code not have some
embedded assembler to do the read/writing anyway, but that's not really
the point here. I suspect that many projects don't go to this length if an
"all Ada" version works.

Also, if you are using AdaMULTI 1.8.9b (or lower?) then I understand
interrupt 18 is reserved. That's an old version now though so you should
be ok if using 2.0.x up.



Mark Fisher <MAFisher@ukgateway.net> wrote in message
news:93igkj$grt$1@lure.pipex.net...
> I am currently getting to grips with the Green Hills `AdaMULTI`
> compiler/environment
> using the Coldfire MCF5307 processor.
>
> In the coming weeks I am doing some risk reduction which is
> being ported from XDAda (83) / Motorola 68020.
>
> Any tips for a new AdaMULTI user? In particular are there known
> weaknesses/problems
> that I should steer clear of?
>
> Many thanks
>
> Mark
>
>
>