Target setting for a53 on rk3399

Hi, I’m trying to compile conv2d for A53 cpu and run it on rk3399, here is my target setting.

target = tvm.target.create('llvm -device=arm_cpu -model=rk3399 -target=aarch64-linux-gnu -mcpu=cortex-a53 -mattr=+neon')

but it always use the two A72 cores run the func. Is there any specific parameter or enviroment variable for this. Thanks