Re: startup embedded target

["William A. Gatliff" <bgat at saturn dot billgatliff dot com>]

Jan:


What does /usr/local/m68k-coff/lib/bcc.ld look like?

Also, add a -Wl,--cref and -Wl,"--Map boot.map" (print a
cross-referenced mapfile), there will be interesting information in
there too.

You can post excerpts of these files to the mailing list, but I'd
prefer that you email them in their entirety to me directly.  I will
reply to the list.


b.g.


On Wed, Jul 25, 2001 at 08:27:02AM +0200, Vermeulen Jan wrote:
> 
> Bill, Geoff,
> 
> >I think that in addition to --nostartfiles, you also want --nodefaultlibs.
> 
> >LD=m68k-coff-ld
> >LDFLAGS=-nodefaultlibs -nostdlib
> >and
> >CC=m68k-coff-gcc
> >CCFLAGS=-nostartfiles
> 
> Thanks for the suggestions, I tried it but at 0x0 there are still things
> that i do not want.
> At 0x0 should be 0x0B40000, at 0x4 should be the adress of main (=0x400) and
> at 0x400 should be main followed by the WritePortB routine. 
> 
> Let me include my commandline and some extra information:
> 
> I hope that you can see where i go wrong. (I guess the collect2 does
> something evil :)
> 
> [(08:07:36) jan@pco449 ~]$ cd ledtest/ledtest
> [(08:07:46) jan@pco449 ~/ledtest/ledtest]$ m68k-coff-gcc -v -m68040 -g  -O2
> -nostartfiles -fverbose-asm -fpack-struct -Wall -Wl,-Tauc.ld
> -Wl,-nodefaultlibs -Wl,-nostdlib -save-temps -o boot.ieee main.c
> Reading specs from /usr/local/lib/gcc-lib/m68k-coff/2.95.3/specs
> gcc version 2.95.3 20010315 (release)
>  /usr/local/lib/gcc-lib/m68k-coff/2.95.3/cpp0 -lang-c -v -D__GNUC__=2
> -D__GNUC_MINOR__=95 -Dmc68000 -D__embedded__ -D__mc68000__ -D__embedded__
> -D__mc68000 -Asystem(embedded) -Amachine(mc68000) -D__OPTIMIZE__ -g -Wall
> -D__HAVE_68881__ -Dmc68040 -D__mc68040__ -D__mc68040 main.c main.i
> GNU CPP version 2.95.3 20010315 (release) (68k, Motorola syntax)
> #include "..." search starts here:
> #include <...> search starts here:
>  /usr/local/lib/gcc-lib/m68k-coff/2.95.3/include
>  /usr/local/lib/gcc-lib/m68k-coff/2.95.3/../../../../m68k-coff/include
> End of search list.
> The following default directories have been omitted from the search path:
>  /usr/local/lib/gcc-lib/m68k-coff/2.95.3/../../../../include/g++-3
>  /usr/local/lib/gcc-lib/m68k-coff/2.95.3/../../../../m68k-coff/sys-include
> End of omitted list.
>  /usr/local/lib/gcc-lib/m68k-coff/2.95.3/cc1 main.i -quiet -dumpbase main.c
> -m68040 -g -O2 -Wall -version -fverbose-asm -fpack-struct -o main.s
> GNU C version 2.95.3 20010315 (release) (m68k-coff) compiled by GNU C
> version 2.96 20000731 (Linux-Mandrake 8.0 2.96-0.48mdk).
>  /usr/local/m68k-coff/bin/as -m68040 -o main.o main.s
>  /usr/local/lib/gcc-lib/m68k-coff/2.95.3/collect2 -m m68kcoff -T
> /usr/local/m68k-coff/lib/bcc.ld -o boot.ieee
> -L/usr/local/lib/gcc-lib/m68k-coff/2.95.3 -L/usr/local/m68k-coff/lib
> -Tauc.ld -nodefaultlibs -nostdlib main.o -lgcc -lc -lbcc -lc -lgcc
> [(08:09:48) jan@pco449 ~/ledtest/ledtest]$ m68k-coff-gdb boot.ieee
> 
> PS: m68k-coff-gdb = Insight 5.0
> 
> 
> Kind regards,
> Jan
> 
> 
> 
> On Tue, Jul 24, 2001 at 04:17:26PM +0200, Vermeulen Jan wrote:
> > 
> > >Try the following :
> > >
> > > SECTIONS {
> > >   .vector0 :
> > >    {
> > >     LONG( __stack )
> > >    } > rom1
> > >   .vector1 :
> > >    {
> > >     LONG( ABSOLUTE( main ) ) /* or _main depending on the compiler */
> > >    } > rom1
> > >.....
> > >
> > >Since these are the 2 first sections that go into rom1, the value for
> stack
> > >will be int the 4 first bytes and the value for main will be int the 4
> next
> > >ones.
> > >
> > >Giovanni Caterina
> > 
> > Thanks for the wonderful suggestions, but unfortunatly it does not work.
> :'(
> > At 0x0 is the code with label 'startup'. Probably something that is in the
> > startupcode.
> > (I assume that it is in crt.0)
> > 
> > I tried with "-nostartfiles" but it is the same thing. At 0x0, there is
> code
> > for some kind of routine that is not in my "main.c" file (only main and
> > WritePortB to write the LED code).
> > 
> > I only want my m68k-coff-gcc to compile those 2 routines : main() and
> > WritePortB(unsigned char c) and nothing else. 
> > 
> > How can I find the error I made and how do I proceed ?
> > Thanks,
> > Jan
> > 
> > ------
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> 
> -- 
> Bill Gatliff
> bgat@billgatliff.com
> 

-- 
Bill Gatliff
bgat@billgatliff.com

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