Supermicro AOC-AG-i4S User Manual page 31

make load
cp if_igb.ko /modules
Edit /boot/loader.conf, and add the following line:
if_igb_load="YES"
or
Compile the driver into the kernel (see item 8). Edit /etc/rc.conf, and create the appropriate
ifconfig_igb<interface_num> entry:
ifconfig_igb<interface_num>="<ifconfig_settings>"
Example usage:
ifconfig_igb0="inet 192.168.10.1 netmask 255.255.255.0"
8. If you want to compile the driver into the kernel, enter:
cd igb-x.x.x/src
mkdir /usr/src/sys/dev/igb
cp if_igb* /usr/src/sys/dev/igb
cp igb* /usr/src/sys/dev/igb
cp Makefile.kernel /usr/src/sys/modules/igb/Makefile
Edit the /usr/src/sys/conf/files.i386 file, and add the following line:
dev/igb/igb_hw.c optional igb
dev/igb/igb_ee.c optional igb
dev/igb/if_igb.c optional igb
Remove the following lines from the /usr/src/sys/conf/files.i386 file, if they exist:
/dev/igb/if_igb_fx_hw.c optional igb
/dev/igb/if_igb_phy.c optional igb
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Chapter 3: Installation