Re: i860 Target

[Charles-Antoine Gauthier <charles dot gauthier at nrc dot ca>]

My mistake. I wasn't paying attention to the leading 'i'. Sorry for the
wasted bandwidth...

Duszczak, Richard wrote:
> 
> For the record, the processor on an MBX860 is NOT an i860.  The i860 is an
> Intel processor while the MBX860 uses the Motorola PowerPC based PowerQUICC
> 860 processor.
> 
> Therefore, code built for a i860-*-elf target will not ever work on the
> MBX860.  Conversely, code built for a powerpc-* target will not ever work in
> a i860 system.
> 
> -----Original Message-----
> From: Charles-Antoine Gauthier [mailto:charles.gauthier@nrc.ca]
> Sent: Friday, May 19, 2000 4:06 PM
> To: Kai Ruottu; crossgcc@sourceware.cygnus.com; Sreedhar Sampath
> Subject: Re: i860 Target
> 
> Hum...
> 
> I am using binutils and gcc to build i860 ELF images for the MBX860 and
> MBX821. Perhaps you are right that the i860-*-elf target is broken. I
> specified --target=powerpc-rtems during configure. As far as I can tell,
> there is absolutely nothing specific to RTEMS in this configuration
> other than the build of a dummy crt0.o whose source is contained in
> newlib. You need this dummy crt0.o for the configure tests that check
> whether the compiler can create executable. This dummy crt0.o should
> never be used in linking real embedded applications. You should get the
> latest patches to gcc and binutils from
> ftp://ftp.oarcorp.com/pub/rtems/betas/rtems-4.5.0-beta/c_tools/source/.
> Rename the target if you don't like powerpc-rtems.
> 
> Notes:
> 
> Use the current snapshot of the binutils. The linker in 2.9.1 is buggy
> and may overlap some output sections. This problem is known and is
> documented in the binutils email archive.
> 
> I had to specify t-ppc rather than t-ppcasm in the configure script for
> the powerpc-rtems target. The t-ppcasm file tries to build all the
> multilib variants of the libraries, which failed for me on the lin
> variant. Besides, I only need the big-endian default and nof
> (soft-float) variants. Why clutter up disk space and waste time building
> unnecessary libraries.
> 
> Kai Ruottu wrote:
> >
> > Sreedhar Sampath wrote:
> > >
> > > I was wondering if any one of you could tell me if gcc has a cross
> > > compiler which could compile for i860 machine.
> >
> >  The current release, gcc-2.95.2 has support for 'i860-*-sysv3*'
> > and 'i860-*-sysv4*', which you can equalize with 'i860-*-coff'
> > and 'i860-*-elf', if aiming at an embedded target. So you can
> > build a compiler which produces i860 assembly code, either for
> > COFF or ELF...
> >
> >  But you probably are interested in the things handling the stuff
> > AFTER the compiling, ie assembling and linking... Unfortunately
> > these are the missing/unimplemented components now. The 'binutils'
> > subdir will be built for 'i860-coff' or 'i860-elf', but the 'gas'
> > and 'ld' subdirs will not, if trying either target with recent
> > binutils sources.
> >
> >  The 'gas/config/tc-i860.*' do exist, so in some time someone was
> > adding the gas-support into GNU binutils, but just "enabling" the
> > 'i860-*-coff' or 'i860-*-elf' by adding these entries and their
> > binary format into 'gas/configure', will not work immediately. I
> > know, I tried... The 'tc-i860.c' has things which are related to
> > the 'aout' binary format (it needs defines from the 'aout_gnu.h'),
> > but then there aren't things like 'i860-*-aout' in the config
> > files...
> >
> >  So the 'i860-coff' and 'i860-elf' targets need someone to port
> > the GNU as and ld for them... Perhaps this has been (partly) done,
> > but the results are lurking somewhere else (than in the GNU binutils
> > sources). Or using GCC and GNU binutils with the native assembler
> > and linker on 'i860-sysv3' and 'i860-sysv4' machines has been the
> > only need, and that being enough, so no work done to get 'gas' and
> > 'ld' work for i860-coff/elf...
> >
> > Cheers, Kai
> >
> > ------
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> 
> --
> Charles-Antoine Gauthier
> Institute for Information Technology   Institut de technologie de
> l'information
> National Research Council of Canada    Conseil national de recherches du
> Canada
> 
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-- 
Charles-Antoine Gauthier
Institute for Information Technology   Institut de technologie de
l'information
National Research Council of Canada    Conseil national de recherches du
Canada

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