龙芯教育派2k1000中运行报错浮点数例外

[Aoison]

root@ls2k:/home/loongson/Desktop/ncnn2/build/examples# ./scrfd test.png
浮点数例外

不清楚什么原因造成的，模型用的是
https://github.com/nihui/ncnn-assets/tree/master/models中的scrfd_500m-opt2.bin

在cmake ncnn时有一个警告，提示的是
-- Could NOT find protobuf (missing: protobuf_DIR)
-- Could NOT find Protobuf (missing: Protobuf_LIBRARIES Protobuf_INCLUDE_DIR)
CMake Warning at tools/caffe/CMakeLists.txt:38 (message):
Protobuf not found, caffe model convert tool won't be built

-- Could NOT find protobuf (missing: protobuf_DIR)
-- Could NOT find Protobuf (missing: Protobuf_LIBRARIES Protobuf_INCLUDE_DIR)
CMake Warning at tools/onnx/CMakeLists.txt:38 (message):
Protobuf not found, onnx model convert tool won't be built

会不会与没有Protobuf 有关？但是也不应该呐
求助一下