GRUB parameter is required for lbpcu running on Debian system (kernel 4.9 or above)

Purpose

LBPCU is Advantech's proprietary utility for controlling LAN Bypass features. Some customers have reported encountering an error message when running the "lbpcu" command.

Target Audience

For those users who are running lbpcu in Debian OS distributions

Minimum requirement

• Advantech products which support Advanced LAB bypass function
• Latest lbpcu executable file from support web site

Symptom

Behavior without correct GRUB parameter, the "Segmentation fault" will pop up when running lbpcu command.

root@debian:/home/ae/lbpcu_binary_01_16# cat /etc/debian_version 
9.3
root@debian:/home/ae/lbpcu_binary_01_16# uname -a
Linux debian 4.9.0-4-amd64 #1 SMP Debian 4.9.65-3+deb9u1 (2017-12-23) x86_64 GNU/Linux
root@debian:/home/ae/lbpcu_binary_01_16# ./lbpcu -VF 1
Segmentation fault
root@debian:/home/ae/lbpcu_binary_01_16# ./lbpcu -VF 2
Segmentation fault
root@debian:/home/ae/lbpcu_binary_01_16# ./lbpcu -GA 1 POWER_ON
Segmentation fault
root@debian:/home/ae/lbpcu_binary_01_16# ./lbpcu -GA 2 POWER_ON
Segmentation fault
root@debian:/home/ae/lbpcu_binary_01_16# more lbpcu.cfg 
SEGMENT: 1
BUS: 0
DEV: 14
FUN: 0

SEGMENT: 2
BUS: 0
DEV: 14
FUN: 2




TYPE: PCIE

Solution 

Please add Kernel parameter "iomem=relaxed" into GRUB menu. Reboot OS and re-run lbpcu command to see if issue can be solved.