On this device, two of the three defined MTD partitions are automatically set to read-only, since they do not end at an erase/write block boundary. In particular, the only partition remaining writable is the one holding the u-boot bootloader. Mark all of the partitions read-only, at least until a better understanding of why the layout has been laid out this way is gained. Signed-off-by: Enrico Mioso <mrkiko.rs@gmail.com>