bananapi ~ # dmesg | grep -E 'psci|CPU|SMP'
[    0.000000] Booting Linux on physical CPU 0x0
[    0.000000] Linux version 4.0.5 (root@bananapi) (gcc version 4.8.3 (Gentoo 4.8.3 p1.1, pie-0.5.9) ) #1 SMP Sun Jun 7 16:40:17 CEST 2015
[    0.000000] CPU: ARMv7 Processor [410fc074] revision 4 (ARMv7), cr=50c5387d
[    0.000000] CPU: PIPT / VIPT nonaliasing data cache, VIPT aliasing instruction cache
[    0.000000] psci: probing for conduit method from DT.
[    0.000000] psci: Using PSCI v0.1 Function IDs from DT
[    0.000000] PERCPU: Embedded 10 pages/cpu @eefcb000 s11072 r8192 d21696 u40960
[    0.000000] SLUB: HWalign=64, Order=0-3, MinObjects=0, CPUs=2, Nodes=1
[    0.000000]  Additional per-CPU info printed with stalls.
[    0.057039] CPU: Testing write buffer coherency: ok
[    0.073112] CPU0: thread -1, cpu 0, socket 0, mpidr 80000000
[    0.086793] CPU1: thread -1, cpu 1, socket 0, mpidr 80000001
[    0.086864] Brought up 2 CPUs
[    0.095684] SMP: Total of 2 processors activated (96.00 BogoMIPS).
[    0.101939] CPU: All CPU(s) started in HYP mode.
[    0.106641] CPU: Virtualization extensions available.
bananapi ~ # lscpu -e -b
CPU SOCKET CORE ONLINE MAXMHZ   MINMHZ
0   0      0    yes    960.0000 144.0000
1   0      1    yes    960.0000 144.0000
bananapi ~ # echo 0 > /sys/devices/system/cpu/cpu1/online ; dmesg | tail -n1
[  187.757649] CPU1: shutdown
bananapi ~ # lscpu -e -b
CPU SOCKET CORE ONLINE MAXMHZ   MINMHZ
0   0      0    yes    960.0000 144.0000
bananapi ~ # echo 1 > /sys/devices/system/cpu/cpu1/online
bananapi ~ # lscpu -e -b
CPU SOCKET CORE ONLINE MAXMHZ   MINMHZ
0   0      0    yes    960.0000 144.0000
1   0      1    yes    960.0000 144.0000