"ERROR: "ntb_register_device" [/root/work/switchtec-kernel/ntb_hw_switchtec.ko] undefined!" message

[JackKimUSA]

Hello,

• OS Version
  root@hwlabpi-sj:~/work/switchtec-kernel# cat /etc/os-release
  PRETTY_NAME="Raspbian GNU/Linux 10 (buster)"
  NAME="Raspbian GNU/Linux"
  VERSION_ID="10"
  VERSION="10 (buster)"
  VERSION_CODENAME=buster
  ID=raspbian
  ID_LIKE=debian
  HOME_URL="http://www.raspbian.org/"
  SUPPORT_URL="http://www.raspbian.org/RaspbianForums"
  BUG_REPORT_URL="http://www.raspbian.org/RaspbianBugs"

• Kernel Version
  root@hwlabpi-sj:~/work/switchtec-kernel# uname -r
  5.4.51-v7l+

• Whe I ran the make command, it has error messages as below:
  root@hwlabpi-sj:~/work/switchtec-kernel# make
  make -C /lib/modules/5.4.51-v7l+/build M=$PWD modules
  make[1]: Entering directory '/usr/src/linux-headers-5.4.51-v7l+'
  Building modules, stage 2.
  MODPOST 2 modules
  ERROR: "ntb_register_device" [/root/work/switchtec-kernel/ntb_hw_switchtec.ko] undefined!
  ERROR: "ntb_link_event" [/root/work/switchtec-kernel/ntb_hw_switchtec.ko] undefined!
  ERROR: "ntb_db_event" [/root/work/switchtec-kernel/ntb_hw_switchtec.ko] undefined!
  ERROR: "ntb_unregister_device" [/root/work/switchtec-kernel/ntb_hw_switchtec.ko] undefined!
  make[2]: *** [scripts/Makefile.modpost:94: __modpost] Error 1
  make[1]: *** [Makefile:1622: modules] Error 2
  make[1]: Leaving directory '/usr/src/linux-headers-5.4.51-v7l+'
  make: *** [Makefile:26: modules] Error 2

Thank you.
Best Regards,
Jack Kim

[carolsheng]

Hey, how did you solve this issue? I met the same one here.

[kelvin-cao]

Did you have CONFIG_NTB set (=m or =y) in your kernel configuration?