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

[Andrei Gherzan]

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`.

-- 
Andrei Gherzan