001
002 Contents of the extra/ directory
003 ================================
004
005 Data and configuration files to support generation of sos on non-x86
006 and/or grub-less hosts:
007 - dot.mkvars: file to copy as .mkvars in the root directory to
008 compile on a non-x86 host, and to generate the grub floppy image on
009 a grub-less host
010 - grub.img.gz: compressed image of a Grub floppy (without any
011 kernel). Used by dot.mkvars.
012 - mtoolsrc: file needed by .mkvars to compile a the floppy image
013
014 Support of a sos-specific boot sector:
015 - Makefile: rules to compile sos_bsect.img, the floppy image with the
016 boot sector and the Sos
017 - bootsect.S: x86 Sos boot sector (GNU as). Depends on sos_bsect.lds
018 - sos_bsect.lds: ld script to bind the boot sector with the remaining
019 of the kernel
020
021 Misc:
022 - patch-qemu-port-e9.diff: patch over qemu to support the bochs "port
023 0xe9 hack"
024 - patch-qemu-pty.diff: patch over qemu to fix a bug related to the
025 handling of the "-monitor pty" and "-serial pty" options
026 - termslave.c: Linux program to dial with qemu's monitor (or serial
027 line) from within a terminal. See comments in the beginning
028
029
030 What you can do with these files
031 ================================
032
033
034 *** Compile SOS from another architecture:
035 ------------------------------------------
036 - compile a cross-compiler for the i586-gnu target. This involves
037 compiling the binutils and gcc. Here are example configuration
038 options for them:
039 binutils (replace sparc-cun-solaris with your arch):
040 ../binutils-2.13/configure --prefix=/udd/ddecotig/temp_dd/xgcc/host-sparc-solaris7/stow/binutils-2.11 --host=sparc-sun-solaris2.7 i586-gnu
041 make && make install
042 gcc (ditto):
043 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
044 make && make install
045 - compile the mtools
046 - copy dot.mkvars to the root directory of SOS, as ".mkvars"
047 - customize the CC/LD/... variables to suit your cross-compiler
048 installatioon
049 - now you may run make from the SOS root directory, it should
050 generate the Grub boot floppy image. The following warning is
051 normal:
052 .mkvars:16: attention : écrasement des commandes pour la cible « grub-sos.img »
053 Makefile:92: attention : anciennes commandes ignorées pour la cible « grub-sos.img »
054
055
056 *** To compile SOS from an x86 where grub is not or incorrectly installed:
057 --------------------------------------------------------------------------
058 - copy dot.mkvars to the root directory of SOS, as ".mkvars"
059 - customize the CC/LD/... variables to suit your cross-compiler
060 installatioon
061 - now you may run make from the SOS root directory, it should
062 generate the Grub boot floppy image. The following warning is
063 normal:
064 .mkvars:16: attention : écrasement des commandes pour la cible « grub-sos.img »
065 Makefile:92: attention : anciennes commandes ignorées pour la cible « grub-sos.img »
066
067
068 *** To compile SOS with its own bootloader:
069 -------------------------------------------
070 - for cross-architecture compilation: see above
071 - cd to this extra/ directory
072 - run 'make'
073 - the floppy image is: sos_bsect.img for use with bochs or on a real
074 floppy disk
075 to use the image under qemu: use sos_qemu.img
076
077 NOTE : From article 2 onward, be warned that using this bootsect
078 might lead to system crashes. This would be because the
079 solution we use to retrieve the RAM size might not work
080 properly on some systems (BIOS buggy or more than 1G RAM). THE
081 best way to boot SOS is always to use Grub.
082
083
084 --
085 David Decotigny