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Contents of the extra/ directory
================================
Data and configuration files to support generation of sos on non-x86
and/or grub-less hosts:
- dot.mkvars: file to copy as .mkvars in the root directory to
compile on a non-x86 host, and to generate the grub floppy image on
a grub-less host
- grub.img.gz: compressed image of a Grub floppy (without any
kernel). Used by dot.mkvars.
- mtoolsrc: file needed by .mkvars to compile a the floppy image
Support of a sos-specific boot sector:
- Makefile: rules to compile sos_bsect.img, the floppy image with the
boot sector and the Sos
- bootsect.S: x86 Sos boot sector (GNU as). Depends on sos_bsect.lds
- sos_bsect.lds: ld script to bind the boot sector with the remaining
of the kernel
Misc:
- qemu-port-e9.diff: patch over qemu to support the bochs "port 0xe9 hack"
What you can do with these files
================================
*** Compile SOS from another architecture:
------------------------------------------
- compile a cross-compiler for the i586-gnu target. This involves
compiling the binutils and gcc. Here are example configuration
options for them:
binutils (replace sparc-cun-solaris with your arch):
../binutils-2.13/configure --prefix=/udd/ddecotig/temp_dd/xgcc/host-sparc-solaris7/stow/binutils-2.11 --host=sparc-sun-solaris2.7 i586-gnu
make && make install
gcc (ditto):
CFLAGS="-O2 -Dinhibit_libc" ../gcc-3.2/configure --target=i586-gnu --prefix=/udd/ddecotig/temp_dd/xgcc/host-sparc-solaris7/stow/gcc-3.2 --with-as=/udd/ddecotig/temp_dd/xgcc/host-sparc-solaris7/bin/as --with-ld=/udd/ddecotig/temp_dd/xgcc/host-sparc-solaris7/bin/ld --with-gnu-as --with-gnu-ld --enable-languages=c --disable-shared --disable-multilib --disable-nls --enable-threads=single
make && make install
- compile the mtools
- copy dot.mkvars to the root directory of SOS, as ".mkvars"
- customize the CC/LD/... variables to suit your cross-compiler
installatioon
- now you may run make from the SOS root directory, it should
generate the Grub boot floppy image. The following warning is
normal:
.mkvars:16: attention : �crasement des commandes pour la cible � grub-sos.img �
Makefile:92: attention : anciennes commandes ignor�es pour la cible � grub-sos.img �
*** To compile SOS from an x86 where grub is not or incorrectly installed:
--------------------------------------------------------------------------
- copy dot.mkvars to the root directory of SOS, as ".mkvars"
- customize the CC/LD/... variables to suit your cross-compiler
installatioon
- now you may run make from the SOS root directory, it should
generate the Grub boot floppy image. The following warning is
normal:
.mkvars:16: attention : �crasement des commandes pour la cible � grub-sos.img �
Makefile:92: attention : anciennes commandes ignor�es pour la cible � grub-sos.img �
*** To compile SOS with its own bootloader:
-------------------------------------------
- for cross-architecture compilation: see above
- cd to this extra/ directory
- run 'make'
- the floppy image is: sos_bsect.img
NOTE : SOS will not boot correctly this way after article 2 !
--
David Decotigny
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