Bare Bone Arm-Elf-Gcc

[William A. Gatliff]

Jeff:


I think this is a great idea, if you stick with the default linker
script as it is now.  I really like that newlib & company work
out-of-the-box for the ARM Evaluator7T platform.  Makes it an easy way
to introduce someone to GNU.

Cheers!


b.g.


On Thu, Feb 06, 2003 at 12:08:08PM -0500, J. Johnston wrote:
> Dave,
> 
>    From the newlib/libgloss side, I have been thinking about this and I
> propose that newlib adds a configuration option that tells newlib not to
> supply low-level syscalls.  This would allow you to build newlib without
> the RDI/RDP syscalls.  You should then place your new code
> in the libgloss/arm directory and build a separate library, crt0, and ld
> script which specifies both your library and your crt0.  You can then
> use the compiler -T option to specify your ld script.
> 
>    The configuration options solves a long-standing problem regarding older
> platforms that put the syscall code in newlib and it really should be
> in libgloss.  We could copy the existing code over to libgloss and eventually
> remove the problem by syncing up a default ld script with the compiler folks.
> 
> -- Jeff J.
> 
> David Mc Kenna wrote:
> > Hi all,
> > 
> > I have successfully compiled gcc v3.2.1, binutils v2.13 and newlib v1.10 on
> > cygwin for Arm-elf.
> > 
> > From these programs I have compiled and run, on hardware, several programs doing
> > math functions,etc. . 
> > 
> > I have come across problems when I try to do printf and scanf statements. My
> > main problem is that from delving into newlib/libc/sys/arm/syscalls.c that printf
> > and scanf require RDI or RDP i.e. Angel or Demon, installed on the chip, which
> > I don't have.
> > 
> > To get over this I have encoded a software UART using bit banging in assembly
> > and I would like gcc to use this function by default for I/O from the chip.
> > 
> > 
> > What is the easiest way to implement this? Is it by modifying syscalls.c or
> > going in via libgloss?
> > 
> > Below is my compile script
> > 
> > Any help is appreciated
> > 
> > Thanks,
> > Dave
> > 
> > 
> > 
> > cd $gccver
> > ln -s ../$newlibver/newlib newlib
> > ln -s ../$newlibver/libgloss libgloss
> > 
> > cp /home/PCAdmin/script/t-arm-elf $src_root/$gccver/gcc/config/arm
> > 
> > 
> > cd $src_root/BUILD/binutils && \rm -rf *
> > ../../$binutilsver/configure \
> >     --with-included-gettext --enable-interwork --with-cpu=arm7tdmi \
> >     --target=$target --host=$host --build=$build --enable-multilib -disable-shared
> > \
> >     --prefix=$prefix -v >  ../logs/$target-$binutilsver-configure.log 2>&1
> > 
> > # 	Make Binutils
> > 
> > make -w all install > ../logs/$target-$binutilsver-make.log 2>&1
> > 
> > 
> > cd $src_root/BUILD/gcc && rm -rf *
> > 
> > $src_root/$gccver/configure \
> >      	--with-newlib --without-headers --with-gnu-as --with-gnu-ld --enable-win32-registry
> > \
> >      	--target=$target --prefix=$prefix --exec-prefix=$prefix --host=$host 
> >  \
> >  	--enable-multilib --enable-interwork --disable-shared --enable-languages=c
> > 
> >>../logs/$target-$gccver-bootconf.log 2>&1
> > 
> > 
> > make all-gcc install-gcc > ../logs/$target-$gccver-bootmake.log 2>&1
> > 
> > cd $src_root/BUILD/newlib
> > $src_root/$newlibver/configure --target=$target --prefix=$prefix > ../logs/$target-$newlibver-conf.log
> > 2>&1
> > 
> > make all install > ../logs/$target-$newlibver-make.log 2>&1
> > 
> > cd $src_root/BUILD/gcc && rm -rf *
> > 
> > $src_root/$gccver/configure \
> >     --enable-languages=c,c++ \
> >     --target=$target --host=$host --build=$build --enable-win32-registry \
> >     --with-newlib \
> >     --prefix=$prefix \
> >     --exec-prefix=$prefix \
> >      --enable-multilib --enable-interwork \
> >     --with-gnu-as --with-gnu-ld  -v > ../logs/$target-$gccver-fullconf.log 2>&1
> > 
> > 
> > make -w all-gcc install-gcc > ../logs/$target-$gccver-fullmake.log 2>&1
> > 
> > 
> > 
> > --
> > http://www.iol.ie
> 
> 
> 
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-- 
Bill Gatliff
Embedded systems and Free Software.  Yea, it *is* all that!
http://billgatliff.com

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