Emulex MD21/S2, Technical Manual

Page: 52 / 88

Controller Reset/Power Up Initialization
The initialization sequence consists of the following events:
1. Initialize SCSI firmware
a. Set status for all LUN's to BUSY
b. Initialize SCSI interface
c. Enable SCSI interrupts
2. At this point, the controller responds to a selection
phase from the initiator but returns a BUSY status until
the initialization sequence is complete.
3. Initialize the disk firmware for each LUN supported by
the controller.
a. If a drive is not connected to this LUN, stop
initialization for this LUN and go to the next LUN.
b. Read the defalt parameters from the drive and/or
switches.
c. If this is a power-up condition and the disable spin
up switch is off, a START UNIT command is sent to the
drive to start the spin up operation. The controller
will not wait for the spin up to complete before
continuing to the initialization sequence. If this is
a SCSI bus reset or bus device message reset, no
action is taken.
d. Turn on the user panel "ready" LED.
4. At this point, the BUSY status is removed from all LUNs
and the controller accepts commands from the initiator.
Once the initialization sequence is complete, the controller
enters the IDLE state and flashes the green LED. As long as the
green LED is flashing, the controller is in its normal state of
operation.
NOTE
The green LED may stop flashing momentarily while
executing an command.
6-4 Controller Initialization and Self-Test Procedures