Kelly Hall wrote:
> 
> CBFalconer wrote:
> > That would probably be a generally useful thing, but is unlikely
> > to happen since the Rabbit is not binary compatible with the
> > Z180.  Any such system would probably be quite slow, because
> > process switching in the Z180 family is not trivial.
> 
> uClinux might be portable since there's no PMMU on the rabbit.
> Performance would likely suck since (a) there's only an 8-bit wide data
> bus off-chip and (b) no internal memory and (c) no instruction cache.
> So the rabbit runs as fast as its byte-wide memory chips, and no faster.
>   A rabbit with a modern DRAM controller and/or some on-chip fast static
> ram might be interesting, but I won't hold my breath - rabbit still
> hasn't added FIFOs on its UARTs.
> 
> A couple of years back Zilog was hinting that they would have some
> flavor of linux available shortly for their eZ80.  To date, linux
> hasn't appeared on it.  The eZ80 would likely run uClinux slowly for (a)
> and (c).
> 
> Personally, I can't think of any CPU that runs linux and maintains
> binary compatibility with the Z180.
> 
> A better project, IMHO, than uClinux on a Rabbit would a quality free C
> compiler that targets the Rabbit.  GCC, SDCC, or LCC would be places to
> start.  A good companion project would be a software emulator, ala MESS
> or MAME.
> 
> Kelly
Thanks to all who replied.

CBFalconer wrote:
> That would probably be a generally useful thing, but is unlikely
> to happen since the Rabbit is not binary compatible with the
> Z180.  Any such system would probably be quite slow, because
> process switching in the Z180 family is not trivial.

uClinux might be portable since there's no PMMU on the rabbit. 
Performance would likely suck since (a) there's only an 8-bit wide data 
bus off-chip and (b) no internal memory and (c) no instruction cache. 
So the rabbit runs as fast as its byte-wide memory chips, and no faster. 
  A rabbit with a modern DRAM controller and/or some on-chip fast static 
ram might be interesting, but I won't hold my breath - rabbit still 
hasn't added FIFOs on its UARTs.

A couple of years back Zilog was hinting that they would have some 
flavor of linux available shortly for their eZ80.  To date, linux 
hasn't appeared on it.  The eZ80 would likely run uClinux slowly for (a) 
and (c).

Personally, I can't think of any CPU that runs linux and maintains 
binary compatibility with the Z180.

A better project, IMHO, than uClinux on a Rabbit would a quality free C 
compiler that targets the Rabbit.  GCC, SDCC, or LCC would be places to 
start.  A good companion project would be a software emulator, ala MESS 
or MAME.

Kelly

REMOVE_NOSPAM_tpkcbq@singnet.com.sg wrote:
> 
> Hello, everyone , is there a port of linux for Rabbit 3000
> microprocessor ?

That would probably be a generally useful thing, but is unlikely
to happen since the Rabbit is not binary compatible with the
Z180.  Any such system would probably be quite slow, because
process switching in the Z180 family is not trivial.

-- 
Chuck F (cbfalconer@yahoo.com) (cbfalconer@worldnet.att.net)
   Available for consulting/temporary embedded and systems.
   <http://cbfalconer.home.att.net>  USE worldnet address!