Hi victorlazzarini,
I think the issue you are getting is because the gpio numbers are different between the Galileo Gen1 and the Galileo Gen2. For example, for the IO7, the Linux gpio number is 27 in the Galileo Gen1, but in the Galileo Gen2 it is the number 38.
My suggestion for you is to use the Yocto Image available here: Galileo Software Downloads, and then check the following site: EmutexLabs. In there you will find a good description about the pin configuration for the Galileo Gen2.
Regards,
Diego.