Display And Leds - ADLINK Technology COM Express Type 7 Starter Kit Plus Quick Start Manual

5.3.

Display and LEDs

This section describes the hexadecimal display and LED functionality.
5.3.1. Bootup Procedure
During power-up and BIOS execution the CPU will first retrieve commands from POST and then execute them.
Each command has a corresponding debug port data code or BIOS POST checkpoint code. The results from each
checkpoint can be viewed on the DB40 Debug Card's LED display, allowing the techinican or administrator to
debug the system. The POST code is written to I/O port 80h, and for extended POST codes port 80h and 81h are
used.
The POST code is shown on the two 7-segment LED displays on the board
5.3.2. LED Table
The following LEDs indicate status of system signals as shown in the table below.
LED
CB_RESET#
CB_PWROK
SUS_S3#
SUS_S4#
SUS_S5#
BMC_STATUS
PWRBTN#
SYS_RESET#
5.3.3. BMC Status
The BMC_STATUS LED shows the status of the BMC on the COM Express module.
Behavior (blue)
Blinking
Bright flash
Fast blinking
Short bright flash
every 4 seconds
Debug Card
Function
LED lights on active reset signal of carrier board
LED lights on active power-OK from COM Express module
LED lights on released SUS_S3# signal from COM Express module
LED lights on released SUS_S4# signal from COM Express module
LED lights on released SUS_S5# signal from COM Express module
LED shows the status of the BMC on the COM Express module
LED lights on active power button signal of COM Express module
LED lights on active reset signal of COM Express module
Description
A blinking BMC_STATUS LED indicates a failure during power up. The
number of flashes indicates the error code. A missing/wrong system voltage,
stuck on the reset line, BIOS failure or an unexpected shutdown of an
onboard power supply is displayed by this signaling code. The error code is
board specific (refer to the user's manual for your COM Express module).
A system state change occurs. Power-button activity, Reset-button activity,
PCI_RST# activity or activity on the SLP_Sx signals is shown by this
signaling mode.
If the board is running on Fail-Safe-BIOS, the BMC_STATUS LED blinks
very quickly.
System is in Suspend-to-RAM or Suspend-to-Disk state.
Type 7 Starter Kit Plus
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