And that works as expected:
julia> convert(CUBLAS.cublasOperation_t, 'T')
CUBLAS_OP_T::cublasOperation_t = 0x00000001
As I said, you need to check for the version of CUDA.jl you’re using. It used to be with a custom function, cublasop, and has been converted to more “Julian” interfaces nowadays. Just look at how CUBLAS.gemm! is implemented.