Problems about zero copy clImportMemoryARM

Hi

    I am trying to malloc a buffer and use it to achieve zero copy between cpu and mali gpu. The device is Redmi Note8pro, Mali G76 MC4, opencl 2.1, ddk

int8_t* src = new int8_t[256];
const cl_import_properties_arm import_properties[] =
{
	CL_IMPORT_TYPE_ARM,
    CL_IMPORT_TYPE_HOST_ARM,
    0
};
cl_int errNum;
cl_mem d_src = clImportMemoryARM(context, CL_MEM_READ_WRITE, import_properties, src, 256, &errNum);

  However, the value of d_src is 0x0, and the cl kernel will crash if access the d_src. 

  Would you please help with the issue? Thanks