Notes about EKF CCM-BOOGIE:
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- System does not start after power is reapplied!
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Sometimes the system does not start after power is reapplied to the board. In almost
all cases this is NOT caused by a hardware failure of the board! It is caused because
the board enters S4 or S5 state after power-up (like a "normal" PC), instead of
running state S0.

Sleep states S4 or S5 are indicated by front panel LED PG=off and one or both LEDs
GP/HD=ON). Chapter "PG (Power Good) LED" on page 25 in User Guide of CCM-BOOGIE
(http://www.ekf.de/c/ccpu/ccm/ccm_uge.pdf) describes this in detail.

To bring the board back to working state the (red) ejector handle in front panel of
CCM-BOOGIE handle must simply be opened for a short time (> 0, less than 4 seconds).
Note: This implies that BIOS setup option "Function of front panel ejector:" is not
changed from its default setting "Power button". More info on this: Chapter "Reset"
on page 24 in User Guide of CCM-BOOGIE.

Technical background:

On EKF CCM-BOOGIE there are 4 reasons why the system enters S4/S5 (sleep) state 
after power-up, instead of S0 (running) state:

1. The user sets BIOS Setup option "Advanced -> Miscellaneous Configuration -> State
   after Power-On:" to mode "Go to S4/S5". The default mode is "Go to S0".

   Description of BIOS Setup item, which controls board behaviour after power-up (G3):
   -> Setup (F2): Advanced -> Miscellaneous Configuration -> State after Power-On:
   Available options:
   a. Go to S0 (Factory Default): After power-on the system always enters S0 state,
      even if the system was in a sleep state at power-off
   b. Go to S4/S5: The system enters S0 state if it was not in a sleep state at power-off.
      It goes to S4 (or S5) sleep state if it was in state S4 (or S5) at power-off.

Even if user option above is not set to "Go to S4/S5" there are three further reasons,
controlled by ICH9 internal hardware, which force sleep state S5 after power-up:

2. The corresponding bit in the SMBus unconditional power down message is set

3. ICH9 internal thermal sensor catastrophic condition (ICH9 overheating)

4. Assertion of THRMTRIP# signal at ICH9 (Processor or GS45 overheating)



Last modified: 2010-02-26 EKF