EKF PC7-FESTIVAL, User Manual

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User Guide • PC7-FESTIVAL • CompactPCI® PlusIO CPU Board
PG (Power Good) LED
The PC7-FESTIVAL offers a bicolour LED labelled PG located within the front panel. After system
reset, this LED defaults to signal different power states:
< Off Sleep state S3, S4 or S5
< Green Healthy
<
Yellow blink Front panel handle open
<
Red steady Hardware failure
<
Red blink Software failure (reserved for future use)
To enter the PG LED state Software Failure, the bit PGLED in the board control register CTRLL_REG
must be set. The PG LED remains in this red blinking state until this bit is cleared. After that it falls
back to its default function.
GP (General Purpose) LED
This programmable bicolour LED can be observed from the PC7-FESTIVAL front panel. The status
of the red part within the LED is controlled by the GPP_D11 of the PCH CM238. Setting GPP_D11
to “1" will switch on the red LED. Turning on or off the green LED is done by setting the bit GPLED
in the board control register CTRLH_REG.
The GP LED is not dedicated to any particular hardware or firmware function with exception of
special power states of the LED PG as described above. Nevertheless, a red blinking GP LED is an
indication that the UEFI/BIOS code couldn't start.
While the CPU card is controlled by the UEFI/BIOS firmware, the GP LED is used to signal board
status information during POST (Power On Self Test). After successful operating system boot, the
GP LED may be freely used by customer software. For details please refer to
http://www.ekf.de/p/pc7/firmware/relnotes.txt.
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