Table of Contents
Advertisement
2.16.9.4
This table lists the control identifiers that can be used with Set/Get Control State IPMI commands to
query or set information on certain controls in the firmware.
FWH Hub (for BIOS bank information)0
FWH 0 Write Protect
FWH 1 Write Protect
FWH 0 Top Block Lock
FWH 1 Top Block Lock4
2.16.9.5
The AT8001 SBC has the ability to be hot-swapped in and out of a chassis. The onboard IPMC
manages the SBC's power-up and power-down transitions. The list below illustrates this process for
power down request.
1- Ejector latch is opened. HOT_SWAP_PB# assertion. IPMC firmware detects the assertion of
this signal.
2- IPMC sends "Deactivation Request" message to SHMC. M state moves from M4-> M5.
3- Board moves from M5 -> M6 if the SHMC grants the request.
4- The IPMC's ACPI timer (3 minutes) starts if an ACPI-enable OS is loaded. Otherwise, it goes
to Step 7 below. The IPMC asserts 20 ms pulse on SMC_PWRBTN#.
The Power Button Status register is set. It then asserts SCI# to the OS. If ACPI OS is
5-
enabled, SCI interrupt handler on the OS is called. Interrupt handler clears PWRBTN_STS
bit. OS starts to perform a graceful shutdown.
The firmware deasserts payload power and sets the IPMI locked bit before it transitions
6-
from M6 to M1 state.
Note:
If the upper-level software moves the IPMC to M6, the same procedure is followed, starting with
Step 4.
2.16.9.6
The AT8001 SBC supports a blue Hot Swap LED mounted on the front panel. The position of this LED
depends on the board option and may be near the top handle or near the bottom handle. 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. The following states are possible:
LED state
OFF
ON
Short blink
Long blink
When the lower ejector handle is disengaged from the faceplate, the hot swap switch embedded in
the PCB will assert a "HOT_SWAP_PB#" signal to the IPMC, and the IPMC will move from the M4
state to the M5 state. At the M5 state, the IPMC will ask the SHMC (or Shelf Manager) for permission
Controls Identifier Table
Control Description
Hot-Swap Process
Hot-Swap LED
Description
Board is in M4 state, normal state when board is in operation.
Ready for hot swap.
M5 state deactivation request
M2 state Activation Request.
Control Number
2-34
0
1
2
3
4
AT8001 User's Guide
Advertisement
Table of Contents
