* [Buildroot] target options for Cortex A8/A9
2015-02-01 20:48 ` Thomas Petazzoni
@ 2015-02-02 13:58 ` Sagaert Johan
0 siblings, 0 replies; 3+ messages in thread
From: Sagaert Johan @ 2015-02-02 13:58 UTC (permalink / raw)
To: buildroot
Dear Thomas ;
Ok thanks for the info, I had selected NEON for the A8 and this resulted in a broken webkit build:
With vfpv3 selected it builds just fine.
Best Regards ,Johan
^[[7m>>> webkit 1.11.5 Building^[[27m
PATH="/home/buildroot12git/output/host/bin:/home/buildroot12git/output/host/sbin:/home/buildroot12git/output/host/usr/bin:/home/buil
droot12git/output/host/usr/sbin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/home/buildroot12git/output/build/host-
cmake-3.0.2/bin" /usr/bin/make -j5 -C /home/buildroot12git/output/build/webkit-1.11.5/
make[1]: Entering directory `/home/buildroot12git/output/build/webkit-1.11.5'
GEN generate-webkit2-forwarding-headers
GEN DerivedSources/JavaScriptCore/LLIntAssembly.h
offlineasm: Parsing ./Source/JavaScriptCore/llint/LowLevelInterpreter.asm and Programs/LLIntOffsetsExtractor and creating assembly
file DerivedSources/JavaScriptCore/LLIntAssembly.h.
offlineasm: No magic values found. Skipping assembly file generation.
GEN generate-webkit2-forwarding-headers
/usr/bin/make all-am
make[2]: Entering directory `/home/buildroot12git/output/build/webkit-1.11.5'
/bin/mkdir -p ./.deps/DerivedSources
CXXLD Programs/jsc-1
CC Source/JavaScriptCore/API/tests/Programs_minidom-JSNodeList.o
CC Source/JavaScriptCore/API/tests/Programs_minidom-JSNode.o
CC Source/JavaScriptCore/API/tests/Programs_minidom-NodeList.o
CXXLD libwebkitgtk-1.0.la
In file included from ./Source/WTF/wtf/UnusedParam.h:24:0,
from Source/JavaScriptCore/API/tests/JSNodeList.c:30:
./Source/WTF/wtf/Platform.h:301:1: error: expected identifier or '(' before '/' token
In file included from ./Source/WTF/wtf/UnusedParam.h:24:0,
from Source/JavaScriptCore/API/tests/JSNode.c:33:
./Source/WTF/wtf/Platform.h:301:1: error: expected identifier or '(' before '/' token
make[2]: *** [Source/JavaScriptCore/API/tests/Programs_minidom-JSNodeList.o] Error 1
make[2]: *** Waiting for unfinished jobs....
make[2]: *** [Source/JavaScriptCore/API/tests/Programs_minidom-JSNode.o] Error 1
/home/buildroot12git/output/build/libglib2-2.42.0/glib/.libs/libglib-2.0.so: warning: the use of OBSOLESCENT `utime' is discouraged,
use `utimes'
/home/buildroot12git/output/build/libglib2-2.42.0/glib/.libs/libglib-2.0.so: warning: the use of OBSOLESCENT `utime' is discouraged,
use `utimes'
/home/buildroot12git/output/host/usr/arm-buildroot-linux-uclibcgnueabi/sysroot/usr/lib/libICE.so: warning: gethostbyaddr is
obsolescent, use getaddrinfo() instead.
/home/buildroot12git/output/host/usr/arm-buildroot-linux-uclibcgnueabi/sysroot/usr/lib/libxml2.so: warning: gethostbyname is
obsolescent, use getnameinfo() instead.
make[2]: Leaving directory `/home/buildroot12git/output/build/webkit-1.11.5'
make[1]: *** [all] Error 2
make[1]: Leaving directory `/home/buildroot12git/output/build/webkit-1.11.5'
make: *** [/home/buildroot12git/output/build/webkit-1.11.5/.stamp_built] Error 2
-----Oorspronkelijk bericht-----
Van: buildroot [mailto:buildroot-bounces at busybox.net] Namens Thomas Petazzoni
Verzonden: zondag 1 februari 2015 21:49
Aan: Sagaert Johan
CC: buildroot at busybox.net
Onderwerp: Re: [Buildroot] target options for Cortex A8/A9
Dear Sagaert Johan,
On Sun, 1 Feb 2015 20:51:48 +0100, Sagaert Johan wrote:
> I am using imx53, this cpu has according to the datasheet an NEON SIMD
> media accelerator and an VFPv3 co-processor.
> So I would assume the same selections options as for the A9.
> I was wondering what makes the target options different for A8 vs A9.
>
> I would think that for the imx53 it sould be the same as for the A9,
> That is an NEON SIMD extension and a vfpv3 floating point engine.
> Please clarify, it is a bit confusing to me.
>
> For the A8 I can select vfpv3 OR Neon, but not vfpv3 WITH NEON extension.
On Cortex-A8, NEON is mandatory. On Cortex-A9, NEON is optional. So when you activate Cortex-A8, Buildroot knows NEON is available.
When you activate Cortex-A9, since NEON is optional, you have to tell Buildroot if NEON is actually available or not.
See arch/Config.in.arm:
config BR2_cortex_a8
bool "cortex-A8"
select BR2_ARM_CPU_HAS_NEON
select BR2_ARM_CPU_HAS_VFPV3
select BR2_ARM_CPU_HAS_THUMB2
select BR2_ARM_CPU_ARMV7A
config BR2_cortex_a9
bool "cortex-A9"
select BR2_ARM_CPU_MAYBE_HAS_NEON
select BR2_ARM_CPU_MAYBE_HAS_VFPV3
select BR2_ARM_CPU_HAS_THUMB2
select BR2_ARM_CPU_ARMV7A
Note the difference between BR2_ARM_CPU_HAS_NEON for Cortex-A8 and BR2_ARM_CPU_MAYBE_HAS_NEON for Cortex-A9.
Best regards,
Thomas
--
Thomas Petazzoni, CTO, Free Electrons
Embedded Linux, Kernel and Android engineering http://free-electrons.com _______________________________________________
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