[time-nuts] Low cost GPS module for < 100ns timestamping error
Jim Lux
jimlux at earthlink.net
Sun May 4 16:30:33 UTC 2014
On 5/4/14, 8:40 AM, Chris Albertson wrote:
> Looks like this is all you'd need for most timing projects. Just add your
> favorite OCXO and some wire.
>
> The SPARC (not Spark) is actually a step up from ARM. It was developed by
> Sun Microsystems (now Oracle) it is optimized for things like fast context
> switching, multi tasking and so on, all the things done by operating
> systems. The Sparc V8 does 128 bit floating point, (quad precision) I
> wonder if 200Kb RAM is enough to run an older version of SunOS? (a BSD
> variant.)
Not all SPARC V8s have FPU: the SPARC spec has a lot of flexibilty in
implmentation: a lot of "if you want X, then it has to do the following
things in the following way, but it's optional"
http://www.gaisler.com/index.php/products/processors/leon3
There's multiprocessor versions. Versions with and without cache,
versions with and without FPU, etc.
If you want a POSIX compliant OS, then RTEMS will definitely fit in
200kbytes. Don't know about all the other options. I've never heard of
a SunOS implementation on LEON, but there's a lot of weird stuff out
there. You do want to make sure that whatever you use is reasonably
complete and of a reasonably recent version (or at least one you're real
familiar with).
There are a fair number of "one-off" ports of some OS or another to the
LEON, but which don't have any continuing support, bug fixes, or users
to contribute. Imagine a grad student doing their thesis on "An
implementation of RSX-11M supervisor mode on the LEON3-MP"... they get
enough done to demonstrate that it works, and they graduate, and who has
a bunch of RSX-11M software anyway.
>
> Are these shipping yet?
>
>
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