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Following this comment I tried the kernel > 5.15.109-dovetail1-rebased on all the following tests. > I just had to update a few unrelated things like the DTS. > > The behaviour with 5.15 is exactly the same. > > >> First of all, can you reproduce the issue when disabling Xenomai? And >> when also disabling dovetail? And when using the corresponding LTS >> kernel as is? > > > Here is what I have tested: > > * LTS kernel (5.10.177 & 5.15.109) : works > * Dovetail kernel (5.10.177-dovetail1 & 5.15.109-dovetail1-rebase)  / > xenomai 3.2.1 >     * with CONFIG_DOVETAIL=n + CONFIG_SMP=y : works >     * with CONFIG_DOVETAIL=y + CONFIG_XENOMAI=n + CONFIG_SMP=y : works >     * with CONFIG_DOVETAIL=y + CONFIG_XENOMAI=y + CONFIG_SMP=n : works >     * with CONFIG_DOVETAIL=y + CONFIG_XENOMAI=y + CONFIG_SMP=y : fails > > As an additional test, I tried with CONFIG_SMP=y but nr_cpus=1 on the > cmdline. > In this configuration the failure still happens. > > > => For me there is a problem specific to the SMP behaviour, since the > tests are working fine in the non SMP case. > It might be that I do not understand the full extend of the SMP vs > xenomai setting though. > > As a sidenote I've added all I the debug flags I could think of. > Unfortunaly I can't use KDB since my serial console (usb-based on > motherboard) does not translate a break correctly and I cannot fall into > kdb. > Is there any own driver involved, or can you reproduce the issue without it as well? I'm furthermore no longer sure if the Zynq 7030 is officially / fully supported by dovetail. Maybe Philippe can comment on that. Jan -- Siemens AG, Technology Competence Center Embedded Linux