Intel Intel NetStructure Single Board Computer manual AdvancedMC Module Activation, Hot Swap LED

MPCBL0010 SBC—Hardware Management Overview

10.9.1Hot Swap LED

The MPCBL0010 SBC supports one blue Hot Swap LED, mounted on the front panel. This LED indicates when it is safe to remove the SBC from the chassis. The on-board IPMC drives this LED to indicate the hot swap state.

When the lower ejector handle is press inward, the hot swap switch embedded in the PCB l asserts a HOT_SWAP_PB# signal to the IPMC, and the IPMC moves from the M4 state to the M5 state. At the M5 state, the IPMC asks the AdvancedTCA shelf manager for permission to move to the M6 state. The Hot Swap LED indicates this state by blinking ON for about 100 milliseconds, followed by 900 milliseconds in the OFF state. This occurs as long as the SBC remains in the M5 state. Once permission is received from the AdvancedTCA shelf manager or higher-level software, the SBC moves to the M6 state.

The AdvancedTCA shelf manager or higher level software can reject the request to move to the M6 state. If this occurs, the hot swap LED returns to a solid OFF condition, indicating that the SBC has returned to the M4 state.

If the SBC reaches the M6 state, either through an extraction request through the lower ejector handle or a direct command from higher-level software, and an ACPI- enabled operating system is loaded on the SBC, the IPMC communicates to the operating system that the module must discontinue operation in preparation for removal. The Hot Swap LED continues to flash during this preparation time, just like it does at the M5 state. When main board power is successfully removed from the SBC, the Hot Swap LED remains lit, indicating it is safe to remove the SBC from the chassis.

Table 122. Hot Swap LED Signals

LED Status	Meaning
Off	Normal status
Blinking blue	Preparing for removal/insertion: Long blink indicates activation is
	in progress, short blink when deactivation is in progress
Solid blue	Ready for hot swap

10.10AdvancedMC Module Activation

The MPCBL0010 SBC is configured to avoid activation of an AdvancedMC module during the BIOS POST or operating system boot sequence. The AdvancedMC module should be installed before BIOS POST, or after the operating system has completed loading.

Within an ATCA chassis, there is often no defined order that the ShMC grants power to the FRU (SBC) and sub-FRU (AdvancedMC module) for an SBC. The MPCBL0010 SBC has a built in delay mechanism that prevents the activation process of the FRU and inserted sub-FRU into M3 state, which is activation in progress until the ShMC has granted power to all FRUs. This allows all FRUs to go to M4 at the same time, at which point the SBC BIOS will scan its devices. There is a timeout (30 second) if for some reason the ShMC does not power up an AdvancedMC module to ensure the SBC will still boot.

After the sychronization occurs, there is a "dead time" (2 seconds) where if a PCI- Express or SATA AdvancedMC module insertion is performed, the payload is reset. This "dead time" has been added to ensure the BIOS will see the AdvancedMC device at boot time.

Intel NetStructure® MPCBL0010 Single Board Computer
Technical Product Specification	October 2006
136	Order Number: 304120