Hi @sven-ola thank you so much for the detailed and thoughtful response — and for taking the time to actually try it yourself! The DKMS approach makes perfect sense; it's clean, survives kernel updates automatically, and fits right in with what's already working on the board for bcmdhd. I'll follow your instructions for b2c2-flexcop-usb. Really appreciate the effort you put into this! 🙏

While I am here: I have a Mediatek Tri-Band Wifi card installed in my RV2 (label reads MT7922A22M). There's a matching driver in OpenWrt created by Felix and friends. This will take some time until pushed upstream. So, why not make it a DKMS module? That's how things started 🤪 # Grab bleeding edge Wifi from OpenWrt cd /usr/src git clone https://github.com/openwrt/mt76.git mt76-6.18 cd mt76-6.18 # Source code massage (needs OpenWrt kernel patch, missing include) git revert 9a46d8d2 sed '/^#include <linux\/kernel.h>/i#include <linux/version.h>' mt76.h # New DKMS config (with more than one module) cat > dkms.conf << "EOF" PACKAGE_NAME="mt76" PACKAGE_VERSION="6.18" BUILT_MODULE_NAME[0]="mt76" DEST_MODULE_LOCATION[0]="/updates/dkms" BUILT_MODULE_NAME[1]="mt76-connac-lib" DEST_MODULE_LOCATION[1]="/updates/dkms" BUILT_MODULE_NAME[2]="mt792x-lib" DEST_MODULE_LOCATION[2]="/updates/dkms" BUILT_MODULE_NAME[3]="mt7921e" BUILT_MODULE_LOCATION[3]="mt7921" DEST_MODULE_LOCATION[3]="/updates/dkms" BUILT_MODULE_NAME[4]="mt7921-common" BUILT_MODULE_LOCATION[4]="mt7921" DEST_MODULE_LOCATION[4]="/updates/dkms" AUTOINSTALL="yes" MAKE="make -C ${kernel_source_dir} M=${dkms_tree}/${PACKAGE_NAME}/${PACKAGE_VERSION}/build CONFIG_WLAN_VENDOR_MEDIATEK=y CONFIG_MT76_CORE=m CONFIG_MT76_LEDS=y CONFIG_MT76_CONNAC_LIB=m CONFIG_MT792x_LIB=m CONFIG_MT7921_COMMON=m CONFIG_MT7921E=m " EOF # Add, build, install, and add matching firmware dkms add -m mt76 -v 6.18 dkms build -m mt76 -v 6.18 dkms install -m mt76 -v 6.18 cp -av firmware/ /lib/firmware/updates/mediatek # Give it a try reboot

Thanks for sharing the header file. I have downloaded that and deployed using dpkg -i <packge name> In order to deploy the VFD, the steps I have followed are given here. I have enclosed the attachment that contains commands and their outcome to keep this post shorter. Below given error message while trying to start the openvfd.service root@x98h:~/linux_openvfd#systemctl daemon-reload root@x98h:~/linux_openvfd# systemctl start openvfd.service Job for openvfd.service failed because the control process exited with error code. See "systemctl status openvfd.service" and "journalctl -xeu openvfd.service" for details. root@x98h:~/linux_openvfd# systemctl status openvfd.service × openvfd.service - openvfd Loaded: loaded (/etc/systemd/system/openvfd.service; disabled; preset: ena> Active: failed (Result: exit-code) since Tue 2026-06-02 00:07:40 IST; 4min> Process: 2297 ExecStartPre=/usr/bin/sh -c . /etc/openvfd.conf; /usr/sbin/mo> Process: 2299 ExecStopPost=/usr/sbin/rmmod openvfd (code=exited, status=1/F> CPU: 47ms Jun 02 00:07:40 x98h systemd[1]: Starting openvfd.service - openvfd... Jun 02 00:07:40 x98h sh[2298]: modprobe: ERROR: could not insert 'openvfd': Exe> Jun 02 00:07:40 x98h systemd[1]: openvfd.service: Control process exited, code=> Jun 02 00:07:40 x98h rmmod[2299]: rmmod: ERROR: Module openvfd is not currently> Jun 02 00:07:40 x98h systemd[1]: openvfd.service: Failed with result 'exit-code> Jun 02 00:07:40 x98h systemd[1]: Failed to start openvfd.service - openvfd. Jun 02 00:07:40 x98h systemd[1]: Failed to start openvfd.service - openvfd. ░░ Subject: A start job for unit openvfd.service has failed ░░ Defined-By: systemd ░░ Support: https://www.debian.org/support ░░ ░░ A start job for unit openvfd.service has finished with a failure. ░░ ░░ The job identifier is 782 and the job result is failed. Jun 02 00:15:18 x98h systemd[1]: Starting openvfd.service - openvfd... ░░ Subject: A start job for unit openvfd.service has begun execution ░░ Defined-By: systemd ░░ Support: https://www.debian.org/support ░░ ░░ A start job for unit openvfd.service has begun execution. ░░ ░░ The job identifier is 855. Jun 02 00:15:18 x98h sh[2317]: modprobe: ERROR: could not insert 'openvfd': Exec format error Jun 02 00:15:18 x98h systemd[1]: openvfd.service: Control process exited, code=exited, status=1/FAILURE ░░ Subject: Unit process exited ░░ Defined-By: systemd ░░ Support: https://www.debian.org/support ░░ ░░ An ExecStartPre= process belonging to unit openvfd.service has exited. ░░ ░░ The process' exit code is 'exited' and its exit status is 1. Jun 02 00:15:18 x98h rmmod[2318]: rmmod: ERROR: Module openvfd is not currently loaded Jun 02 00:15:18 x98h systemd[1]: openvfd.service: Failed with result 'exit-code'. ░░ Subject: Unit failed ░░ Defined-By: systemd ░░ Support: https://www.debian.org/support ░░ ░░ The unit openvfd.service has entered the 'failed' state with result 'exit-code'. Jun 02 00:15:18 x98h systemd[1]: Failed to start openvfd.service - openvfd. ░░ Subject: A start job for unit openvfd.service has failed ░░ Defined-By: systemd ░░ Support: https://www.debian.org/support ░░ ░░ A start job for unit openvfd.service has finished with a failure. ░░ ░░ The job identifier is 855 and the job result is failed. VFD_Service_Logs.txt

@sr4armbian You need this kernel header. https://github.com/NickAlilovic/build/releases/download/20250306/linux-headers-edge-sunxi64_25.05.0-trunk_arm64__6.12.11-S62b2-Da873-P6755-C1a9bH02eb-HK01ba-Vc222-B9bbb-R448a.deb

@Nick A Thanks for your reply. This box got FD6551 chip set that is handling the Front Side Display. I have opened the box and double checked this. I also checked the status of the VFD when the box booted from Android image it came with. The VFD looks similar to the one found in the picture given here. Below given is the section from stock android dts file. I can share the entire dts if you are looking for any other specific details. fd655_para { device_type = "fd655_para"; compatible = "Ik,fd655_dev"; fd655_clk_io = <0x23 0x07 0x06 0x01>; fd655_dat_io = <0x23 0x07 0x07 0x01>; status = "okay"; }; Since the alternate VFD configuration requires latest Linux headers, I am getting errors and I have posted about that in the respective thread in this forum. Trying to deploy the OpenVFD which could be possible. I will share the boot logs at the earliest.