[yocto] [meta-raspberrypi] poky linux build fails if ARM erratum mfix linker switch is specified

[Khem Raj]

On Sun, Nov 3, 2019 at 9:56 AM Andrei Gherzan <andrei at gherzan.ro> wrote:

>
>
> On 3 November 2019 13:18:53 GMT, Khem Raj <raj.khem at gmail.com> wrote:
> >On Sun, Nov 3, 2019 at 2:46 AM Andrei Gherzan <andrei at gherzan.ro>
> >wrote:
> >
> >> On 01/11/2019 17:18, Khem Raj wrote:
> >> > On Fri, Nov 1, 2019 at 1:28 AM Andrei Gherzan <andrei at gherzan.ro>
> >wrote:
> >> >>
> >> >> Hi Steve,
> >> >>
> >> >> On 01/11/2019 05:32, Steve Pavao wrote:
> >> >>> poky linux build fails when ARM erratum mfix linker switch is
> >specified
> >> >>> in local.conf:
> >> >>>
> >> >>> TARGET_LD_ARCH_append += " -mfix-cortex-a53-843419”
> >> >>>
> >> >>> causes build failure.
> >> >>>
> >> >>> Please advise how to use this switch successfully.  I am synced
> >current
> >> >>> in master branch in all layers as of today.  The switch causes
> >libtool
> >> >>> link to fail due to missing libbz2.so.  If I don’t specify the
> >switch,
> >> >>> the build completes without errors.
> >> >>>
> >> >>> It is important to be able to build poky linux with this switch
> >to
> >> avoid
> >> >>> certain crash conditions as described in the ARM errata document.
> >> >>
> >> >> I haven't tried this erratum fix. It is indeed implemented at the
> >> >> linker's lever. It's curious though to see the bz2 dependency. Can
> >you
> >> >> share the specific error? I assume you are doing this on RPi3.
> >> >>
> >> >
> >> > this will impact rpi3 in 64bit mode, don't think 32bit needs this.
> >I
> >> > think its best to
> >> > add this option in raspberrypi3-64.conf perhaps via TUNE_CCARGS
> >>
> >> I was thinking about this. The erratum seems to show that this
> >applies
> >> to all revisions of a53. So it sounds like we should add it in
> >> `tune-cortexa53.inc`.
> >>
> >
> >Up to r0b4 only so maybe not all a53 implementations are impacted
> >
>
> As far as I know that is the latest revision. Do you mean that newer
> revision might come up with this fixed?
>

Rpi3 is one of many cortex a53 implementations

>
> --
> Andrei Gherzan
> gpg: rsa4096/D4D94F67AD0E9640 | t: @agherzan
>
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