Notes and information about EKF PC1-GROOVE:
===========================================


1) PC1-GROOVE does not start after power is reapplied
=====================================================  
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" in User Guide of PC1-GROOVE describes this
in detail: http://www.ekf.de/p/pc1/pc1_uge.pdf

To bring the board back to working state the (red) ejector handle in front panel of
PC1-GROOVE 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"
in User Guide of PC1-GROOVE. See also http://www.ekf.de/c/ccpu/img/reset_400.gif

Technical background:

On EKF PC1-GROOVE there are 4 reasons why the system enters S4/S5 (sleep) state 
after power-up, instead of S0 (running) state:

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

2. PCH QM57 internal thermal sensor catastrophic condition (PCH QM57 overheating)

3. Assertion of THRMTRIP# signal at PCH QM57 (Processor overheating)

4. A Power Button Override event (pressing Power Button more than 4 seconds)


2) Behaviour of LED GP in front panel of PC1-GROOVE during POST
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LED GP (General Purpose) in front panel of PC1 consists of two separate LEDs, one red,
one green. If both are switched on, it can be seen as orange through the panel. Note,
the following behaviour of LED GP is only valid if LED PG (Power Good) lights up green
and for PC1-GROOVE BIOS Builds >= 82:
- A red blinking LED GP indicates: BIOS has not started (-> Board Failure)
- LED GP off immediately after Reset indicates a successful BIOS start
- Approximately one second after Reset green LED GP is switched on to indicate
  a successful start of Legacy BIOS
- Orange LED GP is switched on if the keyboard is ready for F2 key (BIOS Setup)
  or F11 key (Boot Menu). This eases the timing of F2/F11 key presses, cause some
  displays need too much time for their own initialization (i.e. they are not
  yet able to show messages sent from POST).
- Green LED GP is switched on again before BIOS Setup
- Green LED GP is switched off immediately before Boot


3) Invalid CMOS data
====================
If the BIOS detects a bad checksum in CMOS data, CMOS is reset to default values
during POST. The possible reasons for a bad CMOS checksum are:
- An empty battery
- A board with NO battery
- Any software writes to CMOS and does not update the CMOS checksum bytes
For PC1-GROOVE these options exist to manually reset CMOS to default values:
- <F9> key when in BIOS Setup
- Set jumper GP (see PC1 User Guide for more info)
- Reset-in-Series option (more info below)


4) How to reset CMOS when it is not possible to enter BIOS Setup
================================================================
If the BIOS is configured in such a way, that it is not possible to enter Setup (F2
key) and to reset CMOS (F9 key) and it is not possible or difficult to set jumper GP
there exist one further option to completely reset CMOS to factory defaults. This
option is called "Reset-in-Series option". The procedure is as follows:
Step A: Restart the board by a) making a Power-Off-ON sequence or b) by pressing
  reset button if available
Step B: Now restart the board again during the timeframe when LED 'GP' in front panel
  lights green (approximately one second after reset) and BEFORE this LED lights orange
Repeat Step B exactly two times, i.e. Step B must be executed three times in series
after any reset. Now wait until the BIOS prompts you to enter Setup ...

It should be noted that a Power-Off-ON sequence requires a full battery.

The counter, which is used for this option, is cleared when LED 'GP' lights orange
during POST (a few seconds after reset). If you want to reset CMOS and if a reset
from Step B) is made too late (LED GP lights orange), restart with step A.
 
If successfully completed the BIOS loads - after next reset - factory defaults into CMOS.


5) First start of a board with invalid CMOS data
================================================
The first start of a board with invalid CMOS data automatically enables a debug feature,
which redirects all POST Codes, which are normally send to port 80 only, additionally send
to serial port COM1 (IO port 3F8h, 19200 Baud, 8N1) and to video screen in the top right
corner. POST Codes are used to show BIOS progress step by step. If an external serial
terminal is a attached to COM1 (or a Windows PC with Hyperterminal), the progress of the
BIOS can be observed even in case of board failures caused by non-working memory,
non-working graphics etc. The feature will be automatically disabled after the first
successful End of POST, but can be permanently enabled via BIOS Setup:
Setup [F2]: Advanced -> BIOS/POST Options -> Output POST-Codes to COM1 and video -> Enabled


Last modified: 2011-06-08 EKF