Backporting the following 3 patches from Altera to be backported into LTS17: [https://github.com/altera-opensource/linux-socfpga/commit/5d7c07471661af5094a59c751b83a24fdf6d51bb] [https://github.com/altera-opensource/linux-socfpga/commit/0997956fdac8e0832c56f41f1a603be097604def] [https://github.com/altera-opensource/linux-socfpga/commit/1fa74e6361b5a5a6438db4d88c469419ffb3831c] This implementation makes it possible to recover from accessing a non-existent FPGA register. On the downside, this may affect the capability to do a warm reset, which need to be further tested once the backport is available.
