NXP P50XX/e5500: SMP doesn't work anymore with the latest Git kernel

[Christian Zigotzky]

Hello,

SMP doesn't work anymore with the latest Git kernel (28/10/18 11:12AM 
GMT) on my P5020 board and on virtual e5500 QEMU machines.

Board with P5020 dual core CPU:

[    0.000000] -----------------------------------------------------
[    0.000000] phys_mem_size     = 0x200000000
[    0.000000] dcache_bsize      = 0x40
[    0.000000] icache_bsize      = 0x40
[    0.000000] cpu_features      = 0x00000003008003b4
[    0.000000]   possible        = 0x00000003009003b4
[    0.000000]   always          = 0x00000003008003b4
[    0.000000] cpu_user_features = 0xcc008000 0x08000000
[    0.000000] mmu_features      = 0x000a0010
[    0.000000] firmware_features = 0x0000000000000000
[    0.000000] -----------------------------------------------------
[    0.000000] CoreNet Generic board

     ...

[    0.002161] smp: Bringing up secondary CPUs ...
[    0.002339] No cpu-release-addr for cpu 1
[    0.002347] smp: failed starting cpu 1 (rc -2)
[    0.002401] smp: Brought up 1 node, 1 CPU

Virtual e5500 quad core QEMU machine:

[    0.026394] smp: Bringing up secondary CPUs ...
[    0.027831] No cpu-release-addr for cpu 1
[    0.027989] smp: failed starting cpu 1 (rc -2)
[    0.030143] No cpu-release-addr for cpu 2
[    0.030304] smp: failed starting cpu 2 (rc -2)
[    0.032400] No cpu-release-addr for cpu 3
[    0.032533] smp: failed starting cpu 3 (rc -2)
[    0.033117] smp: Brought up 1 node, 1 CPU

QEMU command: ./qemu-system-ppc64 -M ppce500 -cpu e5500 -m 2048 -kernel 
/home/christian/Downloads/vmlinux-4.20-alpha4-AmigaOne_X1000_X5000/X5000_and_QEMU_e5500/uImage-4.20 
-drive 
format=raw,file=/home/christian/Downloads/MATE_PowerPC_Remix_2017_0.9.img,index=0,if=virtio 
-nic user,model=e1000 -append "rw root=/dev/vda" -device virtio-vga 
-device virtio-mouse-pci -device virtio-keyboard-pci -usb -soundhw 
es1370 -smp 4

.config:

...
CONFIG_SMP=y
CONFIG_NR_CPUS=4
...

Please test the latest Git kernel on your NXP P50XX boards.

Thanks,
Christian