Dear Arnd: > > > 3.So you ask me to control IOP(8051) through file_operations, not > > through DEVICE_ATTR > > No, neither of them. Use the appropriate drivers/*/ subsystems for any > functionality that has an existing subsystem. If there is something that the iop > does that does not yet have a subsystem, that requires a more thorough design > discussion for creating a new user interface, ideally in a hardware-independent > way. You should not start with that until all the normal features (rtc, wakeup, > suspend, gpio, ...) are supported. > IOP(8051) has 12 bytes Mailbox registers, which can be read and written by IOP(8051) and System, used to exchange information with the system, faster than shared memory. Thanks
