ACCESS_READ
bpck6_send_cmd(pi, port | ACCESS_PORT | ACCESS_READ);
bpck6_send_cmd(pi, ATA_REG_DATA | ACCESS_PORT | ACCESS_READ);
bpck6_send_cmd(pi, ACCESS_REG | ACCESS_READ | REG_VERSION);
memstress_set_write_percent(vm, (access == ACCESS_READ) ? 0 : 100);
access_memory(vm, nr_vcpus, ACCESS_READ, "Reading from populated memory");
access_memory(vm, nr_vcpus, ACCESS_READ, "Reading from idle memory");