On Tue, Oct 20, 2020 at 10:50 AM Sebastian Huber < sebastian.hu...@embedded-brains.de> wrote:
> On 02/04/2020 09:09, Sebastian Huber wrote: > > > On 02/04/2020 08:46, Chris Johns wrote: > > > >> On 2020-04-02 16:53, Sebastian Huber wrote: > >>> Hallo Chris, > >>> On 21/03/2020 07:45, Sebastian Huber wrote: > >>>> On 20/03/2020 22:23, Chris Johns wrote: > >>>>>> On 20 Mar 2020, at 4:49 pm, Sebastian Huber > >>>>>> <sebastian.hu...@embedded-brains.de> wrote: > >>>>>> > >>>>>> On 20/03/2020 05:15, Chris Johns wrote: > >>>>>> > >>>>>>> On 19/3/20 7:52 pm, Sebastian Huber wrote: > >>>>>>>> The ARMv7-M architecture has no CP-15. The inline assembly for > >>>>>>>> the > >>>>>>>> CP-15 access leads to assembler errors if compiled with -O0. > >>>>>>> I would like to understand this one in detail to see why there > >>>>>>> is cp15 in the build. > >>>>>> In ARMv7-M the system registers are memory mapped. > >>>>>> > >>>>>> If I compile a Cortex-M based BSP with -O0, then I get: > >>>>>> > >>>>> BSP? > >>>> For example the atsamv BSP. > >>> could you please have a look at this. Being able to build with -O0 > >>> is quite helpful during BSP development. > >> > >> Is this important for 5.1.0? > > > > It is not absolutely necessary, but I regularly had to fix this > > locally. We have several ARMv7-M based BSPs. This was my first attempt > > to address this issue: > > > > https://lists.rtems.org/pipermail/devel/2019-February/024914.html > > > We work no on another Cortex-M based BSP and building with -O0 would be > really nice. How about -Og instead? Enable all optimizations which do not negatively impact debugging? --joel > _______________________________________________ > devel mailing list > devel@rtems.org > http://lists.rtems.org/mailman/listinfo/devel
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