Question about Raspberry Pi bspstarthooks.c - potential patch

[Alan Cudmore]

Hi Sebastian,
I understand the move in that commit now.
Maybe it's not working on the single core models because the code is
conditional for ARMV7 + A or ARMV8?
https://git.rtems.org/rtems/tree/bsps/arm/shared/start/start.S#n485
I think the single core RPIs are ARM1176JZF-S (ARMv6Z).
Do the conditional defines come from the compiler?

Thanks,
Alan

On Tue, Jun 29, 2021 at 1:42 AM Sebastian Huber
<sebastian.huber at embedded-brains.de> wrote:
>
> Hello Alan,
>
> On 29/06/2021 03:13, Alan Cudmore wrote:
> > The current RTEMS 6/master branch does not seem to work on the
> > Raspberry Pi single core models, while the 5 branch does.
> >
> > I was able to track it down to a commit where it stopped working:
> > 272534eb725f2486b7a32b39d998202a101bd36e
> >
> > In that commit, the call:
> >   /* Clear Secure or Non-secure Vector Base Address Register */
> >    arm_cp15_set_vector_base_address(bsp_vector_table_begin);
> >
> > Was moved from bsp_start_hook_0 to rpi_start_rtems_on_secondary_processor.
> >
> > If I add it back to bsp_start_hook_0, the single core models work again.
>
> I moved the VBAR setting to start.S. Maybe the problem is that TTBCR is
> no longer set to zero before the VBAR is set. The Raspberry Pi BSP is
> the only BSP which did this.
>
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