I got an issue, when testing command like this :qemu–system–aarch64 -kernel uimage -smp 2...

[Jiang qihong]

The whole command , qemu–system–aarch64 -kernel uimage -M vexpress -a15 -cpu cortex-a57 -smp 2 -m256 --nographic 
The issue is that when running into shell, i didn't find  two cpus.
The parameter "-smp 2",didn't work. 
Does qemu support arch arm -v8 when using the parameter(-smp)? 

From  jqh mobile phone.