BIOS Considerations
The BIOS functions, features and settings are fully contained on the COM Express module. Refer to the COM
Express module manufacturer’s website for detailed BIOS settings. A few settings are generally present
among COM Express Modules that can affect functionality.
•
COM Express Type 6 modules have DDIs (Digital Display Interfaces) that can be implemented as
DisplayPort, HDMI or DVI interfaces. The R4 carrier board implements DisplayPort only. Ensure DDI1 is
set to DisplayPort interface in the BIOS.
Some Passive DisplayPort to DVI adapters have been found which require DDI1 to be set to
HDMI/DVI with the R41004 BIOS. This is the exception, not normal behavior.
If DDI1 is inadvertently set to HDMI/DVI video will not work on native DisplayPort monitors or most
DisplayPort to HDMI/DVI/VGA adapters. If this happens, the computer must be booted and the
BIOS must be entered “blindly” to restore the computer to a usable state. For example, take these
steps to recover an R41004 (Conga-TCA family module) from this state.
1.
Attach a USB keyboard to the computer.
2.
Apply power and immediately and repeatedly press the delete key for 15 seconds. This will ensure
the computer has had time to boot and enter the BIOS.
3.
Press the F9 key to load optimal defaults then press enter to validate the change.
4.
Press the following key pattern:
•
Right arrow,
•
Enter
•
Down arrow 9 times
•
Enter
•
Up arrow
•
Enter
•
F10
•
Enter
5.
If performed properly, the DDI1 setting will have been restored to DisplayPort, the BIOS settings
were saved to flash memory, and the computer was rebooted. The display should now be working. If
this does not work, contact Sealevel Systems Technical support.
“PowerOn after PWR Failure” is a setting present in most BIOS. This setting determines if the
computer boots when power is applied. R4 computers are shipped with this set to always power
on; however, “Remain Off” and “Last State” should never be used. Saving either setting will leave
the computer in a powered down state that cannot be recovered from without removing the lid due
to the intentional absence of a power button.
©Sealevel Systems, Inc.
R4 Manual
35
SL9260 06/2015
