On 12/29/2015 11:43 AM, Mark Cave-Ayland wrote:
On 22/11/15 11:54, Mark Cave-Ayland wrote:
(Add Hervé to CC)
On 21/11/15 16:00, Laurent Vivier wrote:
With gcc-5.2 default target is power7. As openbios targets PowerMacs G3/G4/G5, force gcc target to be G3 (32bit) or G5 (64bit).
Signed-off-by: Laurent Vivier laurent@vivier.eu
config/scripts/switch-arch | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/config/scripts/switch-arch b/config/scripts/switch-arch index 38d263d..bcf807a 100755 --- a/config/scripts/switch-arch +++ b/config/scripts/switch-arch @@ -265,7 +265,7 @@ for ARCH in $arch_list; do ppc) select_prefix powerpc powerpc64 if [ "$unix" = "no" ]; then
CFLAGS="-m32 -msoft-float -fno-builtin-bcopy -fno-builtin-log2"
CFLAGS="-m32 -mcpu=G3 -msoft-float -fno-builtin-bcopy -fno-builtin-log2" AS_FLAGS="-m32" else CFLAGS="-fno-builtin"@@ -275,7 +275,7 @@ for ARCH in $arch_list; do
ppc64) select_prefix powerpc64
CFLAGS="-Wa,-a64 -m64 -msoft-float -fno-builtin"
CFLAGS="-Wa,-a64 -m64 -mcpu=G5 -msoft-float -fno-builtin" AS_FLAGS="-Wa,-a64" ;;Great work! Andreas, I'd be much happier if you could review/commit this (or at least give a Reviewed-by) as this is a little bit out of my area of knowledge...
After some further research, there are currently 2 reasons that make me feel we should be targeting earlier CPUs than the G3 for 32-bit OpenBIOS builds: firstly there are some people trying to emulate PPC 604 CPUs with QEMU/KVM which currently hangs in OpenBIOS, and secondly there has been talk of switching over QEMU's PReP machine from OHW to OpenBIOS instead.
To that end the minimum supported CPU for PPC needs to be 602 and so with this in mind, I've lightly tested the attached patch which seems to work here - Cole, does this work on your compiler setup? If so, I think this is the option I would like to apply upstream.
That patch also fixes the build on fedora 23.
Thanks, Cole