Cross-Compilation error: error adding symbols: File in wrong format

Env.

• remote device: fireflyRK3399, ARM A72, built runtime previously
• local machine: i7-3630, built tvm previously

config.mk

• remote device

DEBUG = 1
USE_OPENCL = 1 # installed opencl previousl
USE_RPC = 1
USE_BLAS = openblas

• local machine

DEBUG = 1
USE_OPENCL = 1 # installed opencl previously
LLVM_CONFIG = llvm-config
USE_BLAS = openblas

Remote Device (ARM A72)

yuanshuai@firefly:~$ python -m tvm.exec.rpc_server --host 0.0.0.0 --port=9090
Loading runtime library /home/yuanshuai/code/tvm/lib/libtvm_runtime.so... exec only
INFO:root:RPCServer: bind to 0.0.0.0:9090
INFO:root:RPCServer: connection from ('192.168.1.110', 60482)
INFO:root:Connection from ('192.168.1.110', 60482)
[01:34:55] src/runtime/rpc/rpc_server_env.cc:23: Upload /tmp/tmp0gxCni/mylib.o... nbytes=4280
INFO:root:Create shared library based on /tmp/tmp0gxCni/mylib.o

Local Machine

yuens@Spark:~/Software/tvm/tutorials/python$ python cross_compilation_and_rpc.py                                                                                                                                                                                                                                         [2/30]
Traceback (most recent call last):
  File "cross_compilation_and_rpc.py", line 189, in <module>
    f = remote.load_module('mylib.o')
  File "/home/yuens/Software/tvm/python/tvm/contrib/rpc.py", line 299, in load_module
    return _LoadRemoteModule(self._sess, path)
  File "/home/yuens/Software/tvm/python/tvm/_ffi/function.py", line 255, in my_api_func
    return flocal(*args)
  File "/home/yuens/Software/tvm/python/tvm/_ffi/_ctypes/function.py", line 183, in __call__
    ctypes.byref(ret_val), ctypes.byref(ret_tcode)))
  File "/home/yuens/Software/tvm/python/tvm/_ffi/base.py", line 62, in check_call
    raise TVMError(py_str(_LIB.TVMGetLastError()))
tvm._ffi.base.TVMError: Except caught from RPC call: TVMCall CFunc Error:
Traceback (most recent call last):
  File "/home/yuanshuai/code/tvm/python/tvm/_ffi/_ctypes/function.py", line 54, in cfun
    rv = local_pyfunc(*pyargs)
  File "/home/yuanshuai/code/tvm/python/tvm/contrib/rpc.py", line 42, in load_module
    cc.create_shared(path + '.so', path)
  File "/home/yuanshuai/code/tvm/python/tvm/contrib/cc.py", line 52, in create_shared
    raise RuntimeError(msg)
RuntimeError: Compilation error:
/usr/bin/ld: /tmp/tmp0gxCni/mylib.o: Relocations in generic ELF (EM: 62)
/usr/bin/ld: /tmp/tmp0gxCni/mylib.o: Relocations in generic ELF (EM: 62)
/tmp/tmp0gxCni/mylib.o: error adding symbols: File in wrong format
collect2: error: ld returned 1 exit status

[tqchen]

try to do gcc -v on the board to see the target triple you have

[tqchen]

Also note that if you want to do CPU testing, it might make sense to add detailed target options, for example

-mattr=+neon

to enable neon support