Re: Kernel Cross Compiling
From: Timothy D. Witham (wookie_at_osdl.org)
Date: 02/14/04
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To: Herbert Poetzl <herbert@13thfloor.at> Date: Sat, 14 Feb 2004 11:25:41 -0800
Well it seems to me it makes more sense to extend rather
than start over.
Tim
On Sat, 2004-02-14 at 05:03, Herbert Poetzl wrote:
> On Sat, Feb 14, 2004 at 12:32:07AM -0800, Timothy D. Witham wrote:
> > Just to point out that we (OSDL) already do this.
> >
> > http://www.osdl.org/projects/26lnxstblztn/results/
> >
> > We are willing to add more but it is always willing
> > to look at adding more.
>
> thanks, yes, I knew about that, but the thing is, I would
> like to use this as automated test (well first step of
> an automated test) for linux-vserver[1] development, and
> for that purpose i386/ia64 and ppc/ppc64 is a good start
> but not nearly sufficient, we currently 'support' (or at
> least try to ;) the following archs:
>
> alpha, i386, ia64, mips/64, hppa/64, ppc/64
> sparc/64, s390/x, x86_64, uml
>
> and got an officially assigned syscall number for
>
> i386, s390, sparc/64, sh3/4, x86_64
>
> but if you are interested in extending this and making
> it available for linux-vserver kernel compile tests
> too, I'm willing to help if I can ...
>
> TIA,
> Herbert
>
> > Tim
> >
> > On Fri, 2004-02-13 at 12:57, Herbert Poetzl wrote:
> > > Hi Folks!
> > >
> > > I'm currently investigating the requirements/doability
> > > of a kernel cross compiling test bed/setup, able to do
> > > automated kernel builds for different architecture,
> > > just to see if it compiles and later to verify if a
> > > given patch breaks that compile on any of the tested
> > > archs ...
> > >
> > > here a short status, and some issues I ran into so far,
> > > some of them with solutions, others without, and some
> > > interesting? observations ...
> > >
> > > I would be happy if somebody who has done similar, or
> > > knows how to do it properly ;) could comment on that,
> > > and/or point out possible improvements ...
> > >
> > > TIA,
> > > Herbert
> > >
> > >
> > > 1) CROSS COMPILER / TOOLCHAIN
> > >
> > > after reading and testing several cross build and
> > > toolchain building howtos, I decided to do it a little
> > > different, because I do not need glibc to compile the
> > > kernel ...
> > >
> > > the result are two .spec files[1], or the commands
> > > used to build an appropriate toolchain ...
> > >
> > > for the binutils the required commands are:
> > >
> > > configure \
> > > --disable-nls \
> > > --prefix=/usr \
> > > --mandir=/usr/share/man \
> > > --infodir=/usr/share/info \
> > > --target=${CROSS_ARCH}-linux
> > > make
> > >
> > > and for the gcc (after the binutils have been
> > > installed on the host):
> > >
> > > configure \
> > > --enable-languages=c \
> > > --disable-nls \
> > > --disable-threads \
> > > --disable-shared \
> > > --disable-checking \
> > > --prefix=/usr \
> > > --mandir=/usr/share/man \
> > > --infodir=/usr/share/info \
> > > --target=${CROSS_ARCH}-linux
> > > make TARGET_LIBGCC2_CFLAGS='-Dinhibit_libc \
> > > -D__gthr_posix_h'
> > >
> > > where ${CROSS_ARCH} is the target architecture you want
> > > to compile the toochain for, in my case, this where one
> > > of the following:
> > >
> > > alpha, hppa, hppa64, i386, ia64, m68k, mips,
> > > mips64, ppc, ppc64, s390, sparc, sparc64, x86_64
> > >
> > > PROBLEMS HERE:
> > >
> > > I decided to use binutils 2.14.90.0.8, and gcc 3.3.2,
> > > but soon discovered that gcc-3.3.2 will not be able
> > > to build a cross compiler for some archs like the
> > > alpha, ia64, powerpc and even i386 ;) without some
> > > modifications[2] but with some help, I got all headers
> > > fixed, except for the ia64, which still doesn't work
> > >
> > >
> > > 2) KERNEL CROSS COMPILING
> > >
> > > equipped with the cross compiling toolchains for all
> > > but one of the architectures mentioned above, I wrote
> > > a little script, which basically does nothing else
> > > but compiling a given kernel for all possible archs.
> > >
> > > basically this can be accomplished by doing:
> > >
> > > make ARCH=<arch> CROSS_COMPILE=<arch>-linux-
> > >
> > >
> > > the first result was harrowing:
> > >
> > > 2.4.25-pre 2.6.2-rc
> > > ----------------------------------------------------
> > > [ARCH alpha/alpha] succeeded. succeeded.
> > > [ARCH hppa/parisc] failed. failed.
> > > [ARCH hppa64/parisc] failed. failed.
> > > [ARCH i386/i386] succeeded. succeeded.
> > > [ARCH m68k/m68k] failed. failed.
> > > [ARCH mips/mips] failed. failed.
> > > [ARCH mips64/mips] failed. failed.
> > > [ARCH ppc/ppc] succeeded. succeeded.
> > > [ARCH ppc64/ppc64] failed. failed.
> > > [ARCH s390/s390] failed. failed.
> > > [ARCH sparc/sparc] failed. succeeded.
> > > [ARCH sparc64/sparc] failed. failed.
> > > [ARCH x86_64/x86_64] failed. succeeded.
> > >
> > > so only alpha, i386 and ppc did work on the first run.
> > >
> > > what I discovered was, that there IS a big difference
> > > between an empty .config file and a non exististing
> > > one, where latter allowed the make oldconfig to work
> > > similar to the make defaultconfig available on 2.6,
> > > and added some archs (see [3] for details)
> > >
> > > PROBLEMS & SOLUTIONS HERE:
> > >
> > > ppc64:
> > > CROSS32_COMPILE=ppc-linux-
> > > is needed to make this work as expected.
> > >
> > > hppa/hppa64:
> > > seems not to compile without using a very big
> > > patch, which changes a lot inside the kernel
> > >
> > > mips/mips64:
> > > seem to use the 'obsoleted' -mcpu= option
> > > which results in a cc1: error: invalid option
> > > `cpu=<cpu-here>'
> > >
> > > m68k:
> > > fails with a hundred errors in the includes
> > >
> > >
> > > 3) CONCLUSIONS
> > >
> > > it seems that recent kernels (2.4 and 2.6) do not support
> > > most of the architectures they contain without heavy
> > > patching (haven't tested for arm, sh3/4, ...)
> > >
> > > building cross compiler toolchains isn't that often done
> > > otherwise it would not require such modifications, and
> > > the documentation would be up to date ...
> > >
> > > it seems that with some minor patches and kernel tweaks
> > > an automated build is in reach, although some archs seem
> > > to break from one release to the other ...
> > >
> > > the non mainline branches, if they exist are some kernel
> > > versions behind the current mainstream kernel, which
> > > might not mean anything ...
> > >
> > >
> > > 4) LINKS & REFERENCES
> > >
> > > [1] http://vserver.13thfloor.at/Stuff/Cross/binutils-cross.spec
> > > http://vserver.13thfloor.at/Stuff/Cross/gcc-cross.spec
> > >
> > > [2] http://vserver.13thfloor.at/Stuff/Cross/
> > > gcc-3.3.2-cross-alpha-fix.diff.bz2
> > > gcc-3.3.2-cross-i386-fix.diff.bz2
> > > gcc-3.3.2-cross-ia64-fix.diff.bz2
> > > gcc-3.3.2-cross-powerpc-fix.diff.bz2
> > >
> > > [3] http://vserver.13thfloor.at/Stuff/Cross/compile.info
> > >
> > > ia64: http://www.gelato.unsw.edu.au/kerncomp/
> > > mips: http://www.linux-mips.org/kernel.html
> > > hppa: http://www.parisc-linux.org/kernel/index.html
> > > ppc64: http://linuxppc64.org/
> > >
> > >
> > > -
> > > To unsubscribe from this list: send the line "unsubscribe linux-gcc" in
> > > the body of a message to majordomo@vger.kernel.org
> > > More majordomo info at http://vger.kernel.org/majordomo-info.html
> > --
> > Timothy D. Witham - Lab Director - wookie@osdl.org
> > Open Source Development Lab Inc - A non-profit corporation
> > 12725 SW Millikan Way - Suite 400 - Beaverton OR, 97005
> > (503)-626-2455 x11 (office) (503)-702-2871 (cell)
> > (503)-626-2436 (fax)
> >
> > -
> > To unsubscribe from this list: send the line "unsubscribe linux-gcc" in
> > the body of a message to majordomo@vger.kernel.org
> > More majordomo info at http://vger.kernel.org/majordomo-info.html
-- Timothy D. Witham - Lab Director - wookie@osdl.org Open Source Development Lab Inc - A non-profit corporation 12725 SW Millikan Way - Suite 400 - Beaverton OR, 97005 (503)-626-2455 x11 (office) (503)-702-2871 (cell) (503)-626-2436 (fax) - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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