On Sat, May 14, 2005 at 08:58:32PM +0200, Peter Karlsson wrote:
> On Fri, 13 May 2005, Hugh Fisher wrote:
>
>
> >When one of these "release the RTL" zealots starts emailing
> >from a box that runs on a free CPU design rather than something
> >by Intel/AMD/IBM, maybe I'll pay some attention to them.
>
> Be careful what you wish for. ;-)
>
> http://www.opencores.org/projects.cgi/web/or1k/openrisc_1200
> http://www.estec.esa.nl/wsmwww/leon/
> http://www.fpgacpu.org/links.html
>
> But of course you would have to manufacture them yourself... :-)
Oddly enough, that's something I've thought about a few times. I
don't see any fundamental obstacle to a clean room implementation of the
680x0 in FPGAs, starting from its published data sheet. For security
applications, the only way to be sure there isn't some dysfeature hiding
inside is to have totally open-source computer software _and_ hardware.
There are probably people who'd pay money for that certainty. Also, the
best way to build safety-critical computer-controlled systems would be a
design that's completely open to auditing by the product safety agencies.
UL and Gastec do approve devices with 8051s in them, because their
experience with that chip goes back so far, but they're not exactly happy
about it.
Maybe somewhere off in the future, after this project breaks new
ground in open hardware design...
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