I don't understand. Why setting an earlier CPU (that supports less instructions) solves the problem of trying to execute unsupported instructions? I think Arm folks should look at this.
Alex On Fri, 12 Jul 2024 at 01:42, Khem Raj via lists.openembedded.org <[email protected]> wrote: > > With latest qemu several places where qemu-usermode is used e.g. > nodejs, qtwebengine, chromium, the builds are failing form armv8a > tuned machines (e.g. tegra) which is due to qemu crash ( SIGILL ) > encoutered when 'max' ISA is used ( which is default ), max seems > to use neoverse-n2 equivalent features, which is evident that SIGILL > also happens when using -cpu neoverse-v2, therefore explicitly select > neoverse-v1 for ISA, which works and covers almost all (if not all) > cpu tunes for armv8 we have. > > Signed-off-by: Khem Raj <[email protected]> > --- > meta/conf/machine/include/arm/arch-arm64.inc | 5 +++++ > 1 file changed, 5 insertions(+) > > diff --git a/meta/conf/machine/include/arm/arch-arm64.inc > b/meta/conf/machine/include/arm/arch-arm64.inc > index 832d0000acb..9639911d33b 100644 > --- a/meta/conf/machine/include/arm/arch-arm64.inc > +++ b/meta/conf/machine/include/arm/arch-arm64.inc > @@ -42,3 +42,8 @@ TARGET_FPU = "${@bb.utils.contains('TUNE_FEATURES', > 'aarch64', '${TARGET_FPU_64} > # support these they're meaningless NOP instructions, so there's very little > # reason not to. > TUNE_CCARGS .= "${@bb.utils.contains('TUNE_FEATURES', 'aarch64', ' > -mbranch-protection=standard', '', d)}" > + > +# Fix qemu-user crashes while building nodejs/chromium/qtwebengine, defaults > ISA is max and it generate SIGILLs > +# qemu: uncaught target signal 4 (Illegal instruction) - core dumped > +# Select the superset ISA > +QEMU_EXTRAOPTIONS_armv8a = "-cpu neoverse-v1" > > >
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