On (11/02/11 16:15), Paul Menzel wrote:
> Am Montag, den 20.12.2010, 10:39 -0800 schrieb Khem Raj:
> > On Mon, Dec 20, 2010 at 7:42 AM, Paul Menzel wrote:
> > > Am Samstag, den 18.12.2010, 22:46 -0800 schrieb Khem Raj:
> > >> On Sat, Dec 18, 2010 at 2:24 AM, Eric Bénard <eric@eukrea.com> wrote:
> > >
> > >> > On 18/12/2010 11:10, Paul Menzel wrote:
> > >> >>
> > >> >> Error: selected processor does not support ARM mode `smc #0'
> > >> >
> > >> > this seems to be a known problem with gcc 4.5 :
> > >> > https://bugs.launchpad.net/ubuntu/+source/gcc-4.5/+bug/669912
> > >>
> > >> Its not a gcc problem to clarify. Its just that older compilers did
> > >> not differentiate security extentions presence.
> > >> http://kernel.ubuntu.com/git?p=ubuntu/ubuntu-natty.git;a=commitdiff;h=1ebe13dea156358f1044a7a755f02945ad3890e4;hp=f31ff7673ef77d04e74e1a1e45bb2940781f35f0
> > >>
> > >> http://kernel.ubuntu.com/git?p=ubuntu/ubuntu-natty.git;a=commitdiff;h=99340d7b23f3df75d9b752fb25088a10064cd0a6;hp=9523bd6810e0229a8147e8c3d6498e2f40b38974
> > >>
> > >> are the fixes you should apply to kernel.
> > >
> > > I just wanted to add that `linux-omap-psp_2.6.32` builds fine with
> > > `angstrom-2010.x` (without the above mentioned patches) which uses the
> > > following toolchain.
> > >
> > >        conf/distro/angstrom-2010.x.conf:ANGSTROM_GCC_VERSION                     ?= "4.5"
> > >        conf/distro/angstrom-2010.x.conf:ANGSTROM_BINUTILS_VERSION                ?= "2.20.1"
> > 
> > yes it will work with binutils < 2.21 the patch I previously implied
> > is in assembler.
> 
> Víctor committed these patches in 4f24435f [1] for
> `linux-omap4_2.6.35.3.bb`. I tried to backport these patches to
> `linux-omap-psp_2.6.32.bb` but I am not successful. A lot seems to have
> changed between Linux 2.6.32 and 2.6.35.
> 
> After the adaptations to `arch/arm/mach-omap2/Makefile` I am now getting
> the next error message.
> 
>         |   LDS     arch/arm/kernel/vmlinux.lds
>         | /tmp/ccpCEAjJ.s: Assembler messages:
>         | /tmp/ccpCEAjJ.s:306: Error: selected processor does not support ARM mode `smc #0'
>         | /tmp/ccpCEAjJ.s:346: Error: selected processor does not support ARM mode `smc #0'
> 
> But I do not know how to adapt that. Is there an easier way to configure
> these security extensions?

yes there are cases where its used in inline assembly and compiler does not
have knob for security extentions. Here is one patch that will work with
binutils >= 2.21 but be away that it will NOT work with older binutils and
infact will render kernel uncompilable if you are not using binutils
atleast at version 2.21

Enjoy

-Khem