We have a ppc32 MPC8248 board that is working perfectly with the 4.19 kernel. We have noticed two issues with the 5.2 kernel:
1) If the new CONFIG_PPC_KUAP (kernel userspace access protection) is enabled the kernel freezes right after initializing all the drivers and just before starting /sbin/init. 2) If CONFIG_PPC_KUAP is disabled the system starts up, but any user space program will hang indefinitely after calling the GCC atomic "__sync_bool_compare_and_swap". This happens when nginx starts. The same nginx binary works fine on a 4.19 kernel.
