Re: RTEMS SMP on Raspberry Pi 2
On Thu, Aug 1, 2019 at 10:33 AM Ricardo Gomes (1161078) <1161...@isep.ipp.pt> wrote: > > Helo, > > First of all, thank you for your response. > You are correct, it freezes at the point it jumps to RTEMS entry point > address. > I cannot understand why it works with the non-smp samples and fails with smp > samples, should I change the address? > You might use objdump to verify the expected instructions at the start address. I don't see that the starting point should differ between SMP and UP, but there are some SMP-specific instructions in the start sequence (bsps/arm/shared/start/start.S), are they being reached? I don't have experience with the RPi2 or access to the board, so I can't offer much beyond that. > > > De: Gedare Bloom > Enviado: 1 de agosto de 2019 04:17 > Para: Ricardo Gomes (1161078) <1161...@isep.ipp.pt> > Cc: devel@rtems.org > Assunto: Re: RTEMS SMP on Raspberry Pi 2 > > On Thu, Aug 1, 2019 at 4:49 AM Ricardo Gomes (1161078) > <1161...@isep.ipp.pt> wrote: > > > > Hello everyone, > > > > I'm trying to collect some results of some experiments that I'm doing > > related with synchronization mechanisms for SMPs. > > So far, I have the results for QEMU but I'm trying to use a Raspberry Pi 2 > > to obtain results in real hardware. > > > > I saw the new patches that were recently added for the raspberry pi bsp and > > as mentioned in the emails related to the new patches I changed the start > > address to 0x20. > > > > However, I have a problem running my samples in the board. The kernel > > compiles without any problem. I'm using the following commands to compile > > it: > > > > arm-rtems5-objcopy -Obinary > > > > > > > > Now the issue occurs when I try to execute my tests for SMP, as the kernel > > freezes during the boot loader first stage. > > > > As a side note, when I compile and execute something para single processor > > na RPi2 I don't have any issue. The issue only occurs when dealing with SMP. > > > > Can someone help me in figuring out what I'm doing wrong? > > > Can you clarify what is the "boot loader first stage"? Usually, that > is pre-kernel code, since it will load the binary image of the kernel, > so it is strange to see different behavior based on different compiled > kernels. Unless it is freezing at the point it jumps to RTEMS entry > start address. > > > Thanks in advance. > > Regards, > > ___ > > devel mailing list > > devel@rtems.org > > http://lists.rtems.org/mailman/listinfo/devel ___ devel mailing list devel@rtems.org http://lists.rtems.org/mailman/listinfo/devel
Re: RTEMS SMP on Raspberry Pi 2
On Thu, Aug 1, 2019 at 4:49 AM Ricardo Gomes (1161078) <1161...@isep.ipp.pt> wrote: > > Hello everyone, > > I'm trying to collect some results of some experiments that I'm doing related > with synchronization mechanisms for SMPs. > So far, I have the results for QEMU but I'm trying to use a Raspberry Pi 2 to > obtain results in real hardware. > > I saw the new patches that were recently added for the raspberry pi bsp and > as mentioned in the emails related to the new patches I changed the start > address to 0x20. > > However, I have a problem running my samples in the board. The kernel > compiles without any problem. I'm using the following commands to compile it: > > arm-rtems5-objcopy -Obinary > > > > Now the issue occurs when I try to execute my tests for SMP, as the kernel > freezes during the boot loader first stage. > > As a side note, when I compile and execute something para single processor na > RPi2 I don't have any issue. The issue only occurs when dealing with SMP. > > Can someone help me in figuring out what I'm doing wrong? > Can you clarify what is the "boot loader first stage"? Usually, that is pre-kernel code, since it will load the binary image of the kernel, so it is strange to see different behavior based on different compiled kernels. Unless it is freezing at the point it jumps to RTEMS entry start address. > Thanks in advance. > Regards, > ___ > devel mailing list > devel@rtems.org > http://lists.rtems.org/mailman/listinfo/devel ___ devel mailing list devel@rtems.org http://lists.rtems.org/mailman/listinfo/devel
RTEMS SMP on Raspberry Pi 2
Hello everyone, I'm trying to collect some results of some experiments that I'm doing related with synchronization mechanisms for SMPs. So far, I have the results for QEMU but I'm trying to use a Raspberry Pi 2 to obtain results in real hardware. I saw the new patches that were recently added for the raspberry pi bsp and as mentioned in the emails related to the new patches I changed the start address to 0x20. However, I have a problem running my samples in the board. The kernel compiles without any problem. I'm using the following commands to compile it: arm-rtems5-objcopy -Obinary Now the issue occurs when I try to execute my tests for SMP, as the kernel freezes during the boot loader first stage. As a side note, when I compile and execute something para single processor na RPi2 I don't have any issue. The issue only occurs when dealing with SMP. Can someone help me in figuring out what I'm doing wrong? Thanks in advance. Regards, ___ devel mailing list devel@rtems.org http://lists.rtems.org/mailman/listinfo/devel
