请问 failed to malloc npu memory!, size: 8189440, flags: 0x2如何解决？

在使用R6C板子跑rknn_yolov5官方demo时报错
post process config: box_conf_threshold = 0.25, nms_threshold = 0.45
Read ./model/bus.jpg ...
img width = 640, img height = 640
Loading mode...
E RKNN: [02:04:08.648] failed to map memory errno = Device or resource busy
E RKNN: [02:04:08.648] failed to malloc npu memory!, size: 8189440, flags: 0x2
E RKNN: [02:04:08.649] rknn_init, load model failed!
rknn_init error ret=-6
网上查资料时说是iommu没有开启，但是我问了客服，客服说这些镜像都没有这个功能，所以我想请教下，要如何解决这个问题？ 感谢！

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