int actual_try_to_identify (ide_drive_t * drive, u8 cmd);
try_to_identify sends an ATA(PI) IDENTIFY request to a drive and waits for a response. It also monitors irqs while this is happening, in hope of automatically determining which one is being used by the interface.
0 device was identified 1 device timed-out (no response to identify request) 2 device aborted the command (refused to identify itself)