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• Confirm the cmdline.txt file doesn’t contain any sections with “console=serial0…..” or

“console=ttyAMA0,…….”.

• Confirm no other software is currently accessing the serial port.

Problem: The Compute Module continually restarts

Solution:

• Confirm the OSD COMPUTE MODULE setting for WDT (Watchdog Timer) is set to DISABLE or, if

set to ENABLE, that any watchdog timer function installed is correctly configured to reset the

timer in the display within the TIME PERIOD set on the OSD.

Problem: Flashing the Compute Module fails after a couple of minutes.

Solution:

• Confirm the OSD COMPUTE MODULE setting for WDT (Watchdog Timer) is set to DISABLE.

Problem: Video playback is slow or jerky

Solutions:

• The default of 64 MB for video may not be enough for full-screen video. Try allocating at least

128 MB system memory as video memory. 192 MB is recommended if for full-screen playback

of 1920x1080 video files.

o Using the Raspberry Pi Config Utility from a terminal window:

sudo raspi-config

Select: 7 Advanced Options

Select: A3 Memory Split

Change to at least 128

 Save and restart the system.

o By editing the config.txt file:

 Modify or add this line if it doesn’t already exist:

gpu_mem=128

 Save and restart the system.

NEC C751Q User Manual

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