GNU compiler for 68360 and 820 cpus

[Joel Sherrill <joel@merlin.gcs.redstone.army.mil>]

On Mon, 24 Mar 1997, Tony Bennett wrote:

> Joel> FYI RTEMS includes the source for all ports (m68k, i386, i960, sparc,
> Joel> powerpc, mips, amd 29k, and hp pa-risc) in a single integrated
> Joel> source tree.  
> 
> And don't forget the one that is arguably most useful :-) the 'unix' port.

Tony and I designed this port and he did most of the actual porting 
effort although I am sure he will happily share credit. :)

The unix port has been used on at least 2 projects I know of (I was 
directly involved in one of them).  It allows RTEMS applications to run 
as a unix process.  UNIX signals are treated as RTEMS interrupts and 
context switches are performed via setjmp/longjmp.  With a little thought 
and some magic, you can actually debug an enormous amount of your 
application using it.  Thr project I was involved with moved from the 
unix port to real tactical hardware with very few problems -- most of 
which were poor documentation on the hardware.  

crossgcc users should be aware of tools like this and processor
simulators.  Tools like sis (sparc) and psim (powerpc) can save you 
untold number of hours versus debugging on real hw.  psim is especially 
good at allowing you to hook in custom IO devices.   Both sis and psim 
are integrated into gdb and simulators for other cpus are also freely 
available.  I have just not used them.

There are a lot of good free tools out there.  Simulators can save a lot 
of time and heartache.

--joel