Emerson ATCA-9305 Manuel D’Utilisation

 Message Listeners

ATCA-9305 User’s Manual

The controller provides a signals to reset the payload.

This provides signals to the controller indicating when the payload has reset for any reason, 
that the payload is powered, and that the payload has finished its monitor booting 
sequence. By default, a powered payload enables the watchdog and disables when the pay-
load is not powered.

The I

2

C port expander provides signals to the payload to define the boot device selection 

(boot select [1 and 2]) and to clear the payload reset indication. The I

2

C port expander com-

municates with the controller via a private I

2

C.

This signal is used by the management controller to reset the payload.

This signal indicates to the management controller that a valid monitor image has finished 
booting and the watchdog can be disabled.

This signal indicates to the management controller that the payload is powered. When pay-
load power is applied, the BMC watchdog will start.

If a shunt is present on J9 [1:2], the controller sets the boot location to socket flash with this 
signal.

When reset, this signal is held high by the payload until it is cleared by the IPMC using the 
payload reset indication clear signal.

These signals select the boot device.

This signal clears the payload reset indication.

Payload port dynamic control can be implemented via message listeners. The payload can 
add itself as a message listener to any message destined for the IPMC target either over 
IPMB-0 or the payload serial interface. When the IPMC receives a subscribed message, the 
IPMC firmware copies the message into the payload’s LUN-10 Receive Message Queue and 
notifies the payload via an unprintable character (ASCII 07, BELL). The payload receives the 
message as described in “Message Bridging.” The message listener list is only eight entries 
long. The payload can add/remove/get list at any time.

Note: