FW: zc706 bsp does not work with maximum processors as 2

[Jonathan Brandmeyer]

If you are overriding the RTEMS memory map, be sure to map OCM as Device
memory. The ROM bootloader accesses it with non-cacheable attributes.



On Thu, Apr 2, 2020 at 4:19 PM Chris Johns <chrisj at rtems.org> wrote:

> On 2020-04-02 18:45, Fernando Domínguez Pousa wrote:
> > Hi again,
> >
> > Finally I could continue my tests on zc706 and the second processor
> start.
> >
> > I could add two breakpoints one at _CPU_SMP_Start_processor (0x0041e7b0)
> and other at _Per_CPU_State_wait_for_non_initial_state (0x0041e7d4) at the
> end of the function  _CPU_SMP_Start_processor. Execution stops and
> continues in both breakpoints, but I still need to need to start the second
> processor from xsdb. I attach you a capture of the objdump done at the end
> of the mail.
>
> The way the process is started is by a write to an address
> (0xfffffff0UL). The second core is parked in code in the ROM monitor
> that is in zynq and when kicked it jumps to the address held in the
> special location. At power up the address points to a ROM loop that just
> loops and power downs. I wonder if xsdb is doing something with the core
> that is effecting what happens?
>
> >> Yes I believe so. I tested the m2003 version.
> > Can you share me the compilation flags you use for your tests
> executables?
>
> I use the ones RTEMS uses to build the BSP with some changes in the
> warning flags. You need to do this to maintain the ABI ...
>
>
> https://docs.rtems.org/branches/master/user/exe/executables.html#machine-flags-and-abi
>
> > And sorry for this answer, but where can I find the m2003 version? Is it
> a git tag, branch.. ? I don't see anything similar on GitHub repos.
>
> Please try the m2004 snapshot. You should have received an email about it.
>
> >> I wonder if xsdb is doing something. Are you able to set a break point
> >> in the code I provided to the link to in zynq_start_bspsmp.c
> > Maybe the JTAG hardware could cause this...
>
> It is not the hardware rather the xsdb software. You may need to tell it
> to use the second core and what it needs to do. I know with OpenOCD you
> need to tell it you have both cores running.
>
> Chris
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-- 
Jonathan Brandmeyer
Vice President of Software Engineering
PlanetiQ
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