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RTL8811CU Driver for Raspbian

License: Other

Makefile 0.37% Shell 0.04% C 99.59%

rtl8811cu_for_raspbian's Introduction

Realtek 8811CU driver for Raspberry Pi OS

Driver for 802.11ac USB adapter with RTL8811CU chipset, only STA/Monitor mode is supported, no AP mode.

A few known wireless cards that use this driver include:

Fastoe AC650 USB Wi-Fi Adapter
TOTOLINK A650UA v3
D-Link - DWA-171C
BrosTrend AC5L
EDUP EP-AC1651
EDUP EP-AC1635
Cudy WU700

Tested with Raspberry Pi OS (32-bit):

Tested Raspberry Pi Devices:

Raspberry Pi 400
Raspberry Pi 4 Model B 2G
Raspberry Pi 4 Model B 4G
Raspberry Pi 4 Model B 8G
Raspberry Pi Zero W
Raspberry Pi Zero v1.3
Raspberry Pi 3 B+
Raspberry Pi 2 B

Installation Information

To build, you have to retrieve source and run make, do following:

For Raspberry Pi OS kernel 5.11 or later, please clone the v5.8.7 branch:

sudo apt install -y bc git dkms build-essential raspberrypi-kernel-headers
git clone -b v5.8.7 https://github.com/fastoe/RTL8811CU_for_Raspbian
cd RTL8811CU_for_Raspbian
make
sudo make install
sudo modprobe 8821cu
sudo reboot

For Raspberry Pi OS 5.10 kernel, clone the v5.8.1 branch:

sudo apt install -y bc git dkms build-essential raspberrypi-kernel-headers
git clone -b v5.8.1 https://github.com/fastoe/RTL8811CU_for_Raspbian
cd RTL8811CU_for_Raspbian
make
sudo make install
sudo modprobe 8821cu
sudo reboot

For Raspberry Pi OS 5.4 or earlier kernel:

sudo apt install -y bc git dkms build-essential raspberrypi-kernel-headers
git clone https://github.com/fastoe/RTL8811CU_for_Raspbian
cd RTL8811CU_for_Raspbian
make
sudo make install
sudo modprobe 8821cu
sudo reboot

If fails to compile like `/lib/modules/5.x.x-v7+/build: No such file or directory. Stop`:

pi@raspberrypi:~/RTL8812BU_for_Raspbian $ make
make ARCH=arm CROSS_COMPILE= -C /lib/modules/5.4.51-v7+/build M=/home/pi/RTL8812BU_for_Raspbian  modules
make[1]: *** /lib/modules/5.x.x-v7+/build: No such file or directory.  Stop.
make: *** [Makefile:2284: modules] Error 2

please run the rpi-source command to install the kernel headers for kernel:

sudo apt install -y bc git flex bison libssl-dev libncurses5-dev
sudo wget https://raw.githubusercontent.com/RPi-Distro/rpi-source/master/rpi-source -O /usr/local/bin/rpi-source && sudo chmod +x /usr/local/bin/rpi-source && /usr/local/bin/rpi-source -q --tag-update
rpi-source

then, re-make again.

If fails to compile like this:

make ARCH=arm CROSS_COMPILE= -C /lib/modules/5.4.51-v7+/build M=/home/pi/rtl8821CU  modules
make[1]: Entering directory '/home/pi/linux-f2f7e4b23d8788e96f81a7522b2f703e51c53e70'
  CC [M]  /home/pi/rtl8821CU/core/rtw_cmd.o
gcc: error: -mfloat-abi=soft and -mfloat-abi=hard may not be used together
make[2]: *** [scripts/Makefile.build:266: /home/pi/rtl8821CU/core/rtw_cmd.o] Error 1
make[1]: *** [Makefile:1709: /home/pi/rtl8821CU] Error 2
make[1]: Leaving directory '/home/pi/linux-f2f7e4b23d8788e96f81a7522b2f703e51c53e70'
make: *** [Makefile:2214: modules] Error 2

please run the following command:

for AArch32 (32-bit)

sudo cp /lib/modules/$(uname -r)/build/arch/arm/Makefile /lib/modules/$(uname -r)/build/arch/arm/Makefile.$(date +%Y%m%d%H%M)
sudo sed -i 's/-msoft-float//' /lib/modules/$(uname -r)/build/arch/arm/Makefile
sudo ln -s /lib/modules/$(uname -r)/build/arch/arm /lib/modules/$(uname -r)/build/arch/armv7l

for AArch64 (64-bit)

sudo cp /lib/modules/$(uname -r)/build/arch/arm64/Makefile /lib/modules/$(uname -r)/build/arch/arm64/Makefile.$(date +%Y%m%d%H%M)
sudo sed -i 's/-mgeneral-regs-only//' /lib/modules/$(uname -r)/build/arch/arm64/Makefile

then, re-make again.

Enjoy!

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rtl8811cu_for_raspbian's Issues

Monitor mode doesn't work

There is no way to put the adapter in monitor mode: aircrack-ng and bettercap won't recognize it. before writing "works in monitor mode" test it, please.

make fails

gcc: error: -mfloat-abi=soft and -mfloat-abi=hard may not be used together

└─# make
make ARCH=arm CROSS_COMPILE= -C /lib/modules/4.19.127-Re4son-v7+/build M=/home/spi/RTL8811CU_for_Raspbian modules
make[1]: Entering directory '/usr/src/linux-headers-4.19.127-Re4son-v7+'
CC [M] /home/spi/RTL8811CU_for_Raspbian/core/rtw_cmd.o
gcc: error: -mfloat-abi=soft and -mfloat-abi=hard may not be used together
make[2]: *** [scripts/Makefile.build:304: /home/spi/RTL8811CU_for_Raspbian/core/rtw_cmd.o] Error 1
make[1]: *** [Makefile:1527: module/home/spi/RTL8811CU_for_Raspbian] Error 2
make[1]: Leaving directory '/usr/src/linux-headers-4.19.127-Re4son-v7+'
make: *** [Makefile:2214: modules] Error 2

any idea?

Kernel 5.15 on Pi 4 no longer able to make

make ARCH=arm CROSS_COMPILE= -C /lib/modules/5.15.26-v7l+/build M=/home/pi/RTL8811CU_for_Raspbian modules
make[1]: Entering directory '/home/pi/linux-db4fcc7bd0fc08a9228a81919af21a68d38826b7'
CC [M] /home/pi/RTL8811CU_for_Raspbian/core/rtw_cmd.o
CC [M] /home/pi/RTL8811CU_for_Raspbian/core/rtw_security.o
CC [M] /home/pi/RTL8811CU_for_Raspbian/core/rtw_debug.o
CC [M] /home/pi/RTL8811CU_for_Raspbian/core/rtw_io.o
CC [M] /home/pi/RTL8811CU_for_Raspbian/core/rtw_ioctl_query.o
CC [M] /home/pi/RTL8811CU_for_Raspbian/core/rtw_ioctl_set.o
CC [M] /home/pi/RTL8811CU_for_Raspbian/core/rtw_ieee80211.o
CC [M] /home/pi/RTL8811CU_for_Raspbian/core/rtw_mlme.o
CC [M] /home/pi/RTL8811CU_for_Raspbian/core/rtw_mlme_ext.o
/home/pi/RTL8811CU_for_Raspbian/core/rtw_mlme_ext.c: In function ‘rtw_txpwr_init_regd’:
/home/pi/RTL8811CU_for_Raspbian/core/rtw_mlme_ext.c:260:6: warning: this statement may fall through [-Wimplicit-fallthrough=]
if (rfctl->regd_name)
^
/home/pi/RTL8811CU_for_Raspbian/core/rtw_mlme_ext.c:263:2: note: here
default:
^~~~~~~
/home/pi/RTL8811CU_for_Raspbian/core/rtw_mlme_ext.c: In function ‘mgt_dispatcher’:
/home/pi/RTL8811CU_for_Raspbian/core/rtw_mlme_ext.c:1350:17: warning: this statement may fall through [-Wimplicit-fallthrough=]
ptable->func = &OnAuthClient;
~~~~~~~~~~~~~^~~~~~~~~~~~~~~
/home/pi/RTL8811CU_for_Raspbian/core/rtw_mlme_ext.c:1352:2: note: here
case WIFI_ASSOCREQ:
^~~~
CC [M] /home/pi/RTL8811CU_for_Raspbian/core/rtw_mi.o
CC [M] /home/pi/RTL8811CU_for_Raspbian/core/rtw_wlan_util.o
CC [M] /home/pi/RTL8811CU_for_Raspbian/core/rtw_vht.o
CC [M] /home/pi/RTL8811CU_for_Raspbian/core/rtw_pwrctrl.o
CC [M] /home/pi/RTL8811CU_for_Raspbian/core/rtw_rf.o
CC [M] /home/pi/RTL8811CU_for_Raspbian/core/rtw_chplan.o
CC [M] /home/pi/RTL8811CU_for_Raspbian/core/rtw_recv.o
CC [M] /home/pi/RTL8811CU_for_Raspbian/core/rtw_sta_mgt.o
CC [M] /home/pi/RTL8811CU_for_Raspbian/core/rtw_ap.o
CC [M] /home/pi/RTL8811CU_for_Raspbian/core/mesh/rtw_mesh.o
CC [M] /home/pi/RTL8811CU_for_Raspbian/core/mesh/rtw_mesh_pathtbl.o
CC [M] /home/pi/RTL8811CU_for_Raspbian/core/mesh/rtw_mesh_hwmp.o
CC [M] /home/pi/RTL8811CU_for_Raspbian/core/rtw_xmit.o
CC [M] /home/pi/RTL8811CU_for_Raspbian/core/rtw_p2p.o
CC [M] /home/pi/RTL8811CU_for_Raspbian/core/rtw_rson.o
CC [M] /home/pi/RTL8811CU_for_Raspbian/core/rtw_tdls.o
CC [M] /home/pi/RTL8811CU_for_Raspbian/core/rtw_br_ext.o
/home/pi/RTL8811CU_for_Raspbian/core/rtw_br_ext.c:20:11: fatal error: net/ipx.h: No such file or directory
#include <net/ipx.h>
^~~~~~~~~~~
compilation terminated.
make[2]: *** [scripts/Makefile.build:277: /home/pi/RTL8811CU_for_Raspbian/core/rtw_br_ext.o] Error 1
make[1]: *** [Makefile:1868: /home/pi/RTL8811CU_for_Raspbian] Error 2
make[1]: Leaving directory '/home/pi/linux-db4fcc7bd0fc08a9228a81919af21a68d38826b7'
make: *** [Makefile:2374: modules] Error 2

Attempting to remake the driver after an incidental Pi4 kernel upgrade. Unable to. Kernel 5.15 Pi4 Pi OS 32Bit.

Fix for failing 64-bit raspberry pi (3b) build

Using make ARCH="arm64" is needed for 64-bit raspberry pi os (rpi 3b+) otherwise the build fails with:

$ make
make ARCH=arm CROSS_COMPILE= -C /lib/modules/5.15.84-v8+/build M=/home/pi/RTL8811CU_for_Raspbian  modules
make[1]: Entering directory '/usr/src/linux-headers-5.15.84-v8+'
  CC [M]  /home/pi/RTL8811CU_for_Raspbian/core/rtw_cmd.o
gcc: error: unrecognized argument in option ‘-mabi=apcs-gnu’
gcc: note: valid arguments to ‘-mabi=’ are: ilp32 lp64
gcc: error: unrecognized command-line option ‘-mapcs’
gcc: error: unrecognized command-line option ‘-mno-sched-prolog’
gcc: error: unrecognized command-line option ‘-msoft-float’
make[2]: *** [scripts/Makefile.build:289: /home/pi/RTL8811CU_for_Raspbian/core/rtw_cmd.o] Error 1
make[1]: *** [Makefile:1902: /home/pi/RTL8811CU_for_Raspbian] Error 2
make[1]: Leaving directory '/usr/src/linux-headers-5.15.84-v8+'
make: *** [Makefile:2503: modules] Error 2

Using v5.8.7 branch.

Kernel:

Linux foo 5.15.84-v8+ #1613 SMP PREEMPT Thu Jan 5 12:03:08 GMT 2023 aarch64 GNU/Linux

Upgrade to latest kernel breaks driver

Just noting that this does not work with the latest kernel.

Works perfectly with 32-bit kernel v 5.15.84 (Thank You) - but an apt-upgrade will upgrade the kernel to 6.1.19 and the driver breaks.

Test report: Works with Debian 11 (raspi.debian.net) on Raspberry Pi 4

I just want to report a special case where your repo is working. Maybe you can update your README.md with that information's.

Hardware is a Raspberry Pi 4
OS is official Debian 11 (currently stable) from https://raspi.debian.net. This is not Raspian or Raspberry PI OS or another debian-derivat. It is just Debian.

I used the v5.8.1 tagged branch. The master/upstream branch did not work.

Modifications I did to your manual was to remove raspberrypi-kernel-headers from the apt install command and replaced the modprob with dkms command.

Thats it

sudo apt install -y bc git dkms build-essential
git clone -b v5.8.1 https://github.com/fastoe/RTL8811CU_for_Raspbian
cd RTL8811CU_for_Raspbian
make
sudo make install
sudo dkms install ./
sudo reboot

One still existing problem is that the USB-WLAN is not detected as a network device while booting. I have to remove and replace the stick than it appears as /dev/wlan1.

Does this driver support the Raspberry Pi 0 2W?

I have two questions:

Your list of supported models includes Raspberry Pi 0 W, but not the "2W" model. Does your driver support the "2W", and if so, has has that been verified; e.g. through "analysis", or "tested on a '2W' model" ??
Why must a driver be compiled? Why not provide a "download compiled driver" option?

Thanks - I just want to be sure before purchasing.

datapage.h:122:15: internal compiler error: Segmentation fault

Can't build from sources. Tried all sugested solutions.

make ARCH=arm CROSS_COMPILE= -C /lib/modules/5.10.17+/build M=/home/pi/src/RTL8811CU_for_Raspbian modules
make[1]: Entering directory '/root/linux-623ca2ba45d86eb1b0323637330295c3f8d93c76'
CC [M] /home/pi/src/RTL8811CU_for_Raspbian/core/rtw_cmd.o
CC [M] /home/pi/src/RTL8811CU_for_Raspbian/core/rtw_security.o
CC [M] /home/pi/src/RTL8811CU_for_Raspbian/core/rtw_debug.o
CC [M] /home/pi/src/RTL8811CU_for_Raspbian/core/rtw_io.o
CC [M] /home/pi/src/RTL8811CU_for_Raspbian/core/rtw_ioctl_query.o
CC [M] /home/pi/src/RTL8811CU_for_Raspbian/core/rtw_ioctl_set.o
CC [M] /home/pi/src/RTL8811CU_for_Raspbian/core/rtw_ieee80211.o
CC [M] /home/pi/src/RTL8811CU_for_Raspbian/core/rtw_mlme.o
CC [M] /home/pi/src/RTL8811CU_for_Raspbian/core/rtw_mlme_ext.o
CC [M] /home/pi/src/RTL8811CU_for_Raspbian/core/rtw_mi.o
CC [M] /home/pi/src/RTL8811CU_for_Raspbian/core/rtw_wlan_util.o
CC [M] /home/pi/src/RTL8811CU_for_Raspbian/core/rtw_vht.o
CC [M] /home/pi/src/RTL8811CU_for_Raspbian/core/rtw_pwrctrl.o
CC [M] /home/pi/src/RTL8811CU_for_Raspbian/core/rtw_rf.o
CC [M] /home/pi/src/RTL8811CU_for_Raspbian/core/rtw_recv.o
CC [M] /home/pi/src/RTL8811CU_for_Raspbian/core/rtw_sta_mgt.o
CC [M] /home/pi/src/RTL8811CU_for_Raspbian/core/rtw_ap.o
CC [M] /home/pi/src/RTL8811CU_for_Raspbian/core/mesh/rtw_mesh.o
CC [M] /home/pi/src/RTL8811CU_for_Raspbian/core/mesh/rtw_mesh_pathtbl.o
CC [M] /home/pi/src/RTL8811CU_for_Raspbian/core/mesh/rtw_mesh_hwmp.o
CC [M] /home/pi/src/RTL8811CU_for_Raspbian/core/rtw_xmit.o
CC [M] /home/pi/src/RTL8811CU_for_Raspbian/core/rtw_p2p.o
CC [M] /home/pi/src/RTL8811CU_for_Raspbian/core/rtw_rson.o
CC [M] /home/pi/src/RTL8811CU_for_Raspbian/core/rtw_tdls.o
CC [M] /home/pi/src/RTL8811CU_for_Raspbian/core/rtw_br_ext.o
CC [M] /home/pi/src/RTL8811CU_for_Raspbian/core/rtw_iol.o
CC [M] /home/pi/src/RTL8811CU_for_Raspbian/core/rtw_sreset.o
CC [M] /home/pi/src/RTL8811CU_for_Raspbian/core/rtw_btcoex_wifionly.o
CC [M] /home/pi/src/RTL8811CU_for_Raspbian/core/rtw_btcoex.o
CC [M] /home/pi/src/RTL8811CU_for_Raspbian/core/rtw_beamforming.o
CC [M] /home/pi/src/RTL8811CU_for_Raspbian/core/rtw_odm.o
CC [M] /home/pi/src/RTL8811CU_for_Raspbian/core/rtw_rm.o
CC [M] /home/pi/src/RTL8811CU_for_Raspbian/core/rtw_rm_fsm.o
CC [M] /home/pi/src/RTL8811CU_for_Raspbian/core/efuse/rtw_efuse.o
CC [M] /home/pi/src/RTL8811CU_for_Raspbian/os_dep/osdep_service.o
CC [M] /home/pi/src/RTL8811CU_for_Raspbian/os_dep/linux/os_intfs.o
CC [M] /home/pi/src/RTL8811CU_for_Raspbian/os_dep/linux/usb_intf.o
CC [M] /home/pi/src/RTL8811CU_for_Raspbian/os_dep/linux/usb_ops_linux.o
CC [M] /home/pi/src/RTL8811CU_for_Raspbian/os_dep/linux/ioctl_linux.o
CC [M] /home/pi/src/RTL8811CU_for_Raspbian/os_dep/linux/xmit_linux.o
CC [M] /home/pi/src/RTL8811CU_for_Raspbian/os_dep/linux/mlme_linux.o
CC [M] /home/pi/src/RTL8811CU_for_Raspbian/os_dep/linux/recv_linux.o
CC [M] /home/pi/src/RTL8811CU_for_Raspbian/os_dep/linux/ioctl_cfg80211.o
CC [M] /home/pi/src/RTL8811CU_for_Raspbian/os_dep/linux/rtw_cfgvendor.o
CC [M] /home/pi/src/RTL8811CU_for_Raspbian/os_dep/linux/wifi_regd.o
CC [M] /home/pi/src/RTL8811CU_for_Raspbian/os_dep/linux/rtw_android.o
CC [M] /home/pi/src/RTL8811CU_for_Raspbian/os_dep/linux/rtw_proc.o
CC [M] /home/pi/src/RTL8811CU_for_Raspbian/os_dep/linux/rtw_rhashtable.o
CC [M] /home/pi/src/RTL8811CU_for_Raspbian/os_dep/linux/ioctl_mp.o
/home/pi/src/RTL8811CU_for_Raspbian/os_dep/linux/ioctl_mp.c: In function ‘rtw_mp_write_reg’:
/home/pi/src/RTL8811CU_for_Raspbian/os_dep/linux/ioctl_mp.c:46:2: warning: ISO C90 forbids variable length array ‘input’ [-Wvla]
char input[wrqu->length + 1];
^~~~
/home/pi/src/RTL8811CU_for_Raspbian/os_dep/linux/ioctl_mp.c: In function ‘rtw_mp_read_reg’:
/home/pi/src/RTL8811CU_for_Raspbian/os_dep/linux/ioctl_mp.c:132:2: warning: ISO C90 forbids variable length array ‘input’ [-Wvla]
char input[wrqu->length + 1];
^~~~
/home/pi/src/RTL8811CU_for_Raspbian/os_dep/linux/ioctl_mp.c: In function ‘rtw_mp_write_rf’:
/home/pi/src/RTL8811CU_for_Raspbian/os_dep/linux/ioctl_mp.c:266:2: warning: ISO C90 forbids variable length array ‘input’ [-Wvla]
char input[wrqu->length];
^~~~
/home/pi/src/RTL8811CU_for_Raspbian/os_dep/linux/ioctl_mp.c: In function ‘rtw_mp_read_rf’:
/home/pi/src/RTL8811CU_for_Raspbian/os_dep/linux/ioctl_mp.c:308:2: warning: ISO C90 forbids variable length array ‘input’ [-Wvla]
char input[wrqu->length];
^~~~
/home/pi/src/RTL8811CU_for_Raspbian/os_dep/linux/ioctl_mp.c: In function ‘rtw_mp_rate’:
/home/pi/src/RTL8811CU_for_Raspbian/os_dep/linux/ioctl_mp.c:413:2: warning: ISO C90 forbids variable length array ‘input’ [-Wvla]
u8 input[wrqu->length + 1];
^~
/home/pi/src/RTL8811CU_for_Raspbian/os_dep/linux/ioctl_mp.c: In function ‘rtw_mp_channel’:
/home/pi/src/RTL8811CU_for_Raspbian/os_dep/linux/ioctl_mp.c:463:2: warning: ISO C90 forbids variable length array ‘input’ [-Wvla]
u8 input[wrqu->length + 1];
^~
/home/pi/src/RTL8811CU_for_Raspbian/os_dep/linux/ioctl_mp.c: In function ‘rtw_mp_ch_offset’:
/home/pi/src/RTL8811CU_for_Raspbian/os_dep/linux/ioctl_mp.c:490:2: warning: ISO C90 forbids variable length array ‘input’ [-Wvla]
u8 input[wrqu->length + 1];
^~
/home/pi/src/RTL8811CU_for_Raspbian/os_dep/linux/ioctl_mp.c: In function ‘rtw_mp_bandwidth’:
/home/pi/src/RTL8811CU_for_Raspbian/os_dep/linux/ioctl_mp.c:517:2: warning: ISO C90 forbids variable length array ‘input’ [-Wvla]
u8 input[wrqu->length];
^~
/home/pi/src/RTL8811CU_for_Raspbian/os_dep/linux/ioctl_mp.c: In function ‘rtw_mp_txpower_index’:
/home/pi/src/RTL8811CU_for_Raspbian/os_dep/linux/ioctl_mp.c:550:2: warning: ISO C90 forbids variable length array ‘input’ [-Wvla]
char input[wrqu->length + 1];
^~~~
/home/pi/src/RTL8811CU_for_Raspbian/os_dep/linux/ioctl_mp.c: In function ‘rtw_mp_txpower’:
/home/pi/src/RTL8811CU_for_Raspbian/os_dep/linux/ioctl_mp.c:596:2: warning: ISO C90 forbids variable length array ‘input’ [-Wvla]
u8 input[wrqu->length];
^~
/home/pi/src/RTL8811CU_for_Raspbian/os_dep/linux/ioctl_mp.c: In function ‘rtw_mp_ant_tx’:
/home/pi/src/RTL8811CU_for_Raspbian/os_dep/linux/ioctl_mp.c:634:2: warning: ISO C90 forbids variable length array ‘input’ [-Wvla]
u8 input[wrqu->length + 1];
^~
/home/pi/src/RTL8811CU_for_Raspbian/os_dep/linux/ioctl_mp.c: In function ‘rtw_mp_ant_rx’:
/home/pi/src/RTL8811CU_for_Raspbian/os_dep/linux/ioctl_mp.c:682:2: warning: ISO C90 forbids variable length array ‘input’ [-Wvla]
u8 input[wrqu->length + 1];
^~
/home/pi/src/RTL8811CU_for_Raspbian/os_dep/linux/ioctl_mp.c: In function ‘rtw_mp_disable_bt_coexist’:
/home/pi/src/RTL8811CU_for_Raspbian/os_dep/linux/ioctl_mp.c:862:2: warning: ISO C90 forbids variable length array ‘input’ [-Wvla]
u8 input[wrqu->data.length + 1];
^~
/home/pi/src/RTL8811CU_for_Raspbian/os_dep/linux/ioctl_mp.c: In function ‘rtw_mp_arx’:
/home/pi/src/RTL8811CU_for_Raspbian/os_dep/linux/ioctl_mp.c:900:2: warning: ISO C90 forbids variable length array ‘input’ [-Wvla]
u8 input[wrqu->length];
^~
/home/pi/src/RTL8811CU_for_Raspbian/os_dep/linux/ioctl_mp.c: In function ‘rtw_mp_pwrtrk’:
/home/pi/src/RTL8811CU_for_Raspbian/os_dep/linux/ioctl_mp.c:1085:2: warning: ISO C90 forbids variable length array ‘input’ [-Wvla]
u8 input[wrqu->length];
^~
/home/pi/src/RTL8811CU_for_Raspbian/os_dep/linux/ioctl_mp.c: In function ‘rtw_mp_psd’:
/home/pi/src/RTL8811CU_for_Raspbian/os_dep/linux/ioctl_mp.c:1123:2: warning: ISO C90 forbids variable length array ‘input’ [-Wvla]
u8 input[wrqu->length + 1];
^~
/home/pi/src/RTL8811CU_for_Raspbian/os_dep/linux/ioctl_mp.c: In function ‘rtw_mp_dump’:
/home/pi/src/RTL8811CU_for_Raspbian/os_dep/linux/ioctl_mp.c:1244:2: warning: ISO C90 forbids variable length array ‘input’ [-Wvla]
u8 input[wrqu->length];
^~
/home/pi/src/RTL8811CU_for_Raspbian/os_dep/linux/ioctl_mp.c: In function ‘rtw_mp_phypara’:
/home/pi/src/RTL8811CU_for_Raspbian/os_dep/linux/ioctl_mp.c:1268:2: warning: ISO C90 forbids variable length array ‘input’ [-Wvla]
char input[wrqu->length];
^~~~
/home/pi/src/RTL8811CU_for_Raspbian/os_dep/linux/ioctl_mp.c: In function ‘rtw_mp_SetRFPath’:
/home/pi/src/RTL8811CU_for_Raspbian/os_dep/linux/ioctl_mp.c:1294:2: warning: ISO C90 forbids variable length array ‘input’ [-Wvla]
char input[wrqu->length];
^~~~
/home/pi/src/RTL8811CU_for_Raspbian/os_dep/linux/ioctl_mp.c: In function ‘rtw_mp_switch_rf_path’:
/home/pi/src/RTL8811CU_for_Raspbian/os_dep/linux/ioctl_mp.c:1345:2: warning: ISO C90 forbids variable length array ‘input’ [-Wvla]
char input[wrqu->length];
^~~~
/home/pi/src/RTL8811CU_for_Raspbian/os_dep/linux/ioctl_mp.c: In function ‘rtw_mp_QueryDrv’:
/home/pi/src/RTL8811CU_for_Raspbian/os_dep/linux/ioctl_mp.c:1394:2: warning: ISO C90 forbids variable length array ‘input’ [-Wvla]
char input[wrqu->data.length];
^~~~
/home/pi/src/RTL8811CU_for_Raspbian/os_dep/linux/ioctl_mp.c: In function ‘rtw_mp_PwrCtlDM’:
/home/pi/src/RTL8811CU_for_Raspbian/os_dep/linux/ioctl_mp.c:1423:2: warning: ISO C90 forbids variable length array ‘input’ [-Wvla]
u8 input[wrqu->length];
^~
/home/pi/src/RTL8811CU_for_Raspbian/os_dep/linux/ioctl_mp.c: In function ‘rtw_mp_hwtx’:
/home/pi/src/RTL8811CU_for_Raspbian/os_dep/linux/ioctl_mp.c:2073:2: warning: ISO C90 forbids variable length array ‘input’ [-Wvla]
u8 input[wrqu->data.length];
^~
CC [M] /home/pi/src/RTL8811CU_for_Raspbian/hal/hal_intf.o
CC [M] /home/pi/src/RTL8811CU_for_Raspbian/hal/hal_com.o
CC [M] /home/pi/src/RTL8811CU_for_Raspbian/hal/hal_com_phycfg.o
CC [M] /home/pi/src/RTL8811CU_for_Raspbian/hal/hal_phy.o
CC [M] /home/pi/src/RTL8811CU_for_Raspbian/hal/hal_dm.o
CC [M] /home/pi/src/RTL8811CU_for_Raspbian/hal/hal_dm_acs.o
CC [M] /home/pi/src/RTL8811CU_for_Raspbian/hal/hal_btcoex_wifionly.o
CC [M] /home/pi/src/RTL8811CU_for_Raspbian/hal/hal_btcoex.o
CC [M] /home/pi/src/RTL8811CU_for_Raspbian/hal/hal_mp.o
CC [M] /home/pi/src/RTL8811CU_for_Raspbian/hal/hal_mcc.o
CC [M] /home/pi/src/RTL8811CU_for_Raspbian/hal/hal_hci/hal_usb.o
CC [M] /home/pi/src/RTL8811CU_for_Raspbian/hal/led/hal_led.o
CC [M] /home/pi/src/RTL8811CU_for_Raspbian/hal/led/hal_usb_led.o
CC [M] /home/pi/src/RTL8811CU_for_Raspbian/hal/hal_halmac.o
CC [M] /home/pi/src/RTL8811CU_for_Raspbian/hal/rtl8821c/rtl8821c_halinit.o
CC [M] /home/pi/src/RTL8811CU_for_Raspbian/hal/rtl8821c/rtl8821c_mac.o
CC [M] /home/pi/src/RTL8811CU_for_Raspbian/hal/rtl8821c/rtl8821c_cmd.o
CC [M] /home/pi/src/RTL8811CU_for_Raspbian/hal/rtl8821c/rtl8821c_phy.o
CC [M] /home/pi/src/RTL8811CU_for_Raspbian/hal/rtl8821c/rtl8821c_dm.o
CC [M] /home/pi/src/RTL8811CU_for_Raspbian/hal/rtl8821c/rtl8821c_ops.o
CC [M] /home/pi/src/RTL8811CU_for_Raspbian/hal/rtl8821c/hal8821c_fw.o
CC [M] /home/pi/src/RTL8811CU_for_Raspbian/hal/rtl8821c/usb/rtl8821cu_halinit.o
CC [M] /home/pi/src/RTL8811CU_for_Raspbian/hal/rtl8821c/usb/rtl8821cu_halmac.o
CC [M] /home/pi/src/RTL8811CU_for_Raspbian/hal/rtl8821c/usb/rtl8821cu_io.o
CC [M] /home/pi/src/RTL8811CU_for_Raspbian/hal/rtl8821c/usb/rtl8821cu_xmit.o
CC [M] /home/pi/src/RTL8811CU_for_Raspbian/hal/rtl8821c/usb/rtl8821cu_recv.o
CC [M] /home/pi/src/RTL8811CU_for_Raspbian/hal/rtl8821c/usb/rtl8821cu_led.o
CC [M] /home/pi/src/RTL8811CU_for_Raspbian/hal/rtl8821c/usb/rtl8821cu_ops.o
CC [M] /home/pi/src/RTL8811CU_for_Raspbian/hal/efuse/rtl8821c/HalEfuseMask8821C_USB.o
CC [M] /home/pi/src/RTL8811CU_for_Raspbian/hal/halmac/halmac_api.o
In file included from ./arch/arm/include/asm/vdso_datapage.h:14,
from ./arch/arm/include/asm/elf.h:7,
from ./include/linux/elf.h:6,
from ./include/linux/module.h:18,
from /home/pi/src/RTL8811CU_for_Raspbian/include/basic_types.h:76,
from /home/pi/src/RTL8811CU_for_Raspbian/hal/halmac/halmac_2_platform.h:27,
from /home/pi/src/RTL8811CU_for_Raspbian/hal/halmac/halmac_type.h:19,
from /home/pi/src/RTL8811CU_for_Raspbian/hal/halmac/halmac_api.c:16:
./include/vdso/datapage.h:122:15: internal compiler error: Segmentation fault
extern struct vdso_data _timens_data[CS_BASES] attribute((visibility("hidden")));
^~~~~~~~~
0xb6a8a11f ???
../sysdeps/unix/sysv/linux/arm/sigrestorer.S:64
Please submit a full bug report,
with preprocessed source if appropriate.
Please include the complete backtrace with any bug report.
See file:///usr/share/doc/gcc-8/README.Bugs for instructions.
make[2]: *** [scripts/Makefile.build:279: /home/pi/src/RTL8811CU_for_Raspbian/hal/halmac/halmac_api.o] Error 1
make[1]: *** [Makefile:1804: /home/pi/src/RTL8811CU_for_Raspbian] Error 2
make[1]: Leaving directory '/root/linux-623ca2ba45d86eb1b0323637330295c3f8d93c76'
make: *** [Makefile:2214: modules] Error 2

Specifiy goal in repo name

I am not sure but I would assume that this repo is not focused on Raspbian but on the Raspberry Pi architecture, right?

Raspbian (today called "Raspberry Pi OS") is just an OS. I assume that other Raspberry Pi related linux distros are related also. Am I right?

For example I would bring pure (official) Debian (from https://raspi.debian.net) into account.

Not work on Raspbian 11 with 5.10.103-v7+ kernel.

I am running a Pi-Star system on Raspberry Pi Zero 2W board. lsb_release -a shows that the system version is Raspbian 11 bullseye, uname -a shows "Linux portable-star 5.10.103-v7+ #1529 SMP Tue Mar 8 12:21:37 GMT 2022 armv7l GNU/Linux".

Everything goes well during download the code from github, make and make install. But after sudo modprobe 8821cu, it says "modprobe: ERROR: could not insert '8821cu': Exec format error", and the last lines of dmesg are as follow:
[ 7098.872432] 8821cu: loading out-of-tree module taints kernel.
[ 7098.996449] 8821cu: unknown relocation: 3

After reboot the board, the same error message show again when modprobe and dmesg.

make failed

I try to build the driver on the arm64-raspios,but it failed.
I have run the rpi-source,raspi64.sh and the command for AArch64 in README.md

The error log are as follow:

root@raspberrypi:~/RTL8811CU_for_Raspbian# make
make ARCH=arm64 CROSS_COMPILE= -C /lib/modules/5.10.17-v8+/build M=/root/RTL8811CU_for_Raspbian  modules
make[1]: Entering directory '/root/linux-3a33f11c48572b9dd0fecac164b3990fc9234da8'
  CC [M]  /root/RTL8811CU_for_Raspbian/core/rtw_cmd.o
  CC [M]  /root/RTL8811CU_for_Raspbian/core/rtw_security.o
  CC [M]  /root/RTL8811CU_for_Raspbian/core/rtw_debug.o
  CC [M]  /root/RTL8811CU_for_Raspbian/core/rtw_io.o
  CC [M]  /root/RTL8811CU_for_Raspbian/core/rtw_ioctl_query.o
  CC [M]  /root/RTL8811CU_for_Raspbian/core/rtw_ioctl_set.o
  CC [M]  /root/RTL8811CU_for_Raspbian/core/rtw_ieee80211.o
  CC [M]  /root/RTL8811CU_for_Raspbian/core/rtw_mlme.o
  CC [M]  /root/RTL8811CU_for_Raspbian/core/rtw_mlme_ext.o
  CC [M]  /root/RTL8811CU_for_Raspbian/core/rtw_mi.o
  CC [M]  /root/RTL8811CU_for_Raspbian/core/rtw_wlan_util.o
  CC [M]  /root/RTL8811CU_for_Raspbian/core/rtw_vht.o
  CC [M]  /root/RTL8811CU_for_Raspbian/core/rtw_pwrctrl.o
  CC [M]  /root/RTL8811CU_for_Raspbian/core/rtw_rf.o
  CC [M]  /root/RTL8811CU_for_Raspbian/core/rtw_chplan.o
  CC [M]  /root/RTL8811CU_for_Raspbian/core/rtw_recv.o
  CC [M]  /root/RTL8811CU_for_Raspbian/core/rtw_sta_mgt.o
  CC [M]  /root/RTL8811CU_for_Raspbian/core/rtw_ap.o
  CC [M]  /root/RTL8811CU_for_Raspbian/core/mesh/rtw_mesh.o
  CC [M]  /root/RTL8811CU_for_Raspbian/core/mesh/rtw_mesh_pathtbl.o
  CC [M]  /root/RTL8811CU_for_Raspbian/core/mesh/rtw_mesh_hwmp.o
  CC [M]  /root/RTL8811CU_for_Raspbian/core/rtw_xmit.o
  CC [M]  /root/RTL8811CU_for_Raspbian/core/rtw_p2p.o
  CC [M]  /root/RTL8811CU_for_Raspbian/core/rtw_rson.o
  CC [M]  /root/RTL8811CU_for_Raspbian/core/rtw_tdls.o
  CC [M]  /root/RTL8811CU_for_Raspbian/core/rtw_br_ext.o
  CC [M]  /root/RTL8811CU_for_Raspbian/core/rtw_iol.o
  CC [M]  /root/RTL8811CU_for_Raspbian/core/rtw_sreset.o
  CC [M]  /root/RTL8811CU_for_Raspbian/core/rtw_btcoex_wifionly.o
  CC [M]  /root/RTL8811CU_for_Raspbian/core/rtw_btcoex.o
  CC [M]  /root/RTL8811CU_for_Raspbian/core/rtw_beamforming.o
  CC [M]  /root/RTL8811CU_for_Raspbian/core/rtw_odm.o
  CC [M]  /root/RTL8811CU_for_Raspbian/core/rtw_rm.o
  CC [M]  /root/RTL8811CU_for_Raspbian/core/rtw_rm_fsm.o
  CC [M]  /root/RTL8811CU_for_Raspbian/core/rtw_rm_util.o
  CC [M]  /root/RTL8811CU_for_Raspbian/core/efuse/rtw_efuse.o
  CC [M]  /root/RTL8811CU_for_Raspbian/os_dep/osdep_service.o
  CC [M]  /root/RTL8811CU_for_Raspbian/os_dep/linux/os_intfs.o
  CC [M]  /root/RTL8811CU_for_Raspbian/os_dep/linux/usb_intf.o
  CC [M]  /root/RTL8811CU_for_Raspbian/os_dep/linux/usb_ops_linux.o
  CC [M]  /root/RTL8811CU_for_Raspbian/os_dep/linux/ioctl_linux.o
  CC [M]  /root/RTL8811CU_for_Raspbian/os_dep/linux/xmit_linux.o
  CC [M]  /root/RTL8811CU_for_Raspbian/os_dep/linux/mlme_linux.o
  CC [M]  /root/RTL8811CU_for_Raspbian/os_dep/linux/recv_linux.o
  CC [M]  /root/RTL8811CU_for_Raspbian/os_dep/linux/ioctl_cfg80211.o
  CC [M]  /root/RTL8811CU_for_Raspbian/os_dep/linux/rtw_cfgvendor.o
  CC [M]  /root/RTL8811CU_for_Raspbian/os_dep/linux/wifi_regd.o
  CC [M]  /root/RTL8811CU_for_Raspbian/os_dep/linux/rtw_android.o
  CC [M]  /root/RTL8811CU_for_Raspbian/os_dep/linux/rtw_proc.o
  CC [M]  /root/RTL8811CU_for_Raspbian/os_dep/linux/rtw_rhashtable.o
  CC [M]  /root/RTL8811CU_for_Raspbian/os_dep/linux/ioctl_mp.o
  CC [M]  /root/RTL8811CU_for_Raspbian/hal/hal_intf.o
  CC [M]  /root/RTL8811CU_for_Raspbian/hal/hal_com.o
  CC [M]  /root/RTL8811CU_for_Raspbian/hal/hal_com_phycfg.o
  CC [M]  /root/RTL8811CU_for_Raspbian/hal/hal_phy.o
  CC [M]  /root/RTL8811CU_for_Raspbian/hal/hal_dm.o
  CC [M]  /root/RTL8811CU_for_Raspbian/hal/hal_dm_acs.o
  CC [M]  /root/RTL8811CU_for_Raspbian/hal/hal_btcoex_wifionly.o
  CC [M]  /root/RTL8811CU_for_Raspbian/hal/hal_btcoex.o
  CC [M]  /root/RTL8811CU_for_Raspbian/hal/hal_mp.o
  CC [M]  /root/RTL8811CU_for_Raspbian/hal/hal_mcc.o
  CC [M]  /root/RTL8811CU_for_Raspbian/hal/hal_hci/hal_usb.o
  CC [M]  /root/RTL8811CU_for_Raspbian/hal/led/hal_led.o
  CC [M]  /root/RTL8811CU_for_Raspbian/hal/led/hal_usb_led.o
  CC [M]  /root/RTL8811CU_for_Raspbian/hal/rtl8821c/rtl8821c_halinit.o
  CC [M]  /root/RTL8811CU_for_Raspbian/hal/rtl8821c/rtl8821c_mac.o
  CC [M]  /root/RTL8811CU_for_Raspbian/hal/rtl8821c/rtl8821c_cmd.o
  CC [M]  /root/RTL8811CU_for_Raspbian/hal/rtl8821c/rtl8821c_phy.o
  CC [M]  /root/RTL8811CU_for_Raspbian/hal/rtl8821c/rtl8821c_dm.o
  CC [M]  /root/RTL8811CU_for_Raspbian/hal/rtl8821c/rtl8821c_ops.o
  CC [M]  /root/RTL8811CU_for_Raspbian/hal/rtl8821c/hal8821c_fw.o
  CC [M]  /root/RTL8811CU_for_Raspbian/hal/rtl8821c/usb/rtl8821cu_halinit.o
  CC [M]  /root/RTL8811CU_for_Raspbian/hal/rtl8821c/usb/rtl8821cu_halmac.o
  CC [M]  /root/RTL8811CU_for_Raspbian/hal/rtl8821c/usb/rtl8821cu_io.o
  CC [M]  /root/RTL8811CU_for_Raspbian/hal/rtl8821c/usb/rtl8821cu_xmit.o
  CC [M]  /root/RTL8811CU_for_Raspbian/hal/rtl8821c/usb/rtl8821cu_recv.o
  CC [M]  /root/RTL8811CU_for_Raspbian/hal/rtl8821c/usb/rtl8821cu_led.o
  CC [M]  /root/RTL8811CU_for_Raspbian/hal/rtl8821c/usb/rtl8821cu_ops.o
  CC [M]  /root/RTL8811CU_for_Raspbian/hal/efuse/rtl8821c/HalEfuseMask8821C_USB.o
  CC [M]  /root/RTL8811CU_for_Raspbian/hal/hal_halmac.o
  CC [M]  /root/RTL8811CU_for_Raspbian/hal/halmac/halmac_api.o
  CC [M]  /root/RTL8811CU_for_Raspbian/hal/halmac/halmac_dbg.o
  CC [M]  /root/RTL8811CU_for_Raspbian/hal/halmac/halmac_88xx/halmac_bb_rf_88xx.o
  CC [M]  /root/RTL8811CU_for_Raspbian/hal/halmac/halmac_88xx/halmac_cfg_wmac_88xx.o
  CC [M]  /root/RTL8811CU_for_Raspbian/hal/halmac/halmac_88xx/halmac_common_88xx.o
  CC [M]  /root/RTL8811CU_for_Raspbian/hal/halmac/halmac_88xx/halmac_efuse_88xx.o
  CC [M]  /root/RTL8811CU_for_Raspbian/hal/halmac/halmac_88xx/halmac_flash_88xx.o
  CC [M]  /root/RTL8811CU_for_Raspbian/hal/halmac/halmac_88xx/halmac_fw_88xx.o
  CC [M]  /root/RTL8811CU_for_Raspbian/hal/halmac/halmac_88xx/halmac_gpio_88xx.o
  CC [M]  /root/RTL8811CU_for_Raspbian/hal/halmac/halmac_88xx/halmac_init_88xx.o
  CC [M]  /root/RTL8811CU_for_Raspbian/hal/halmac/halmac_88xx/halmac_mimo_88xx.o
  CC [M]  /root/RTL8811CU_for_Raspbian/hal/halmac/halmac_88xx/halmac_usb_88xx.o
  CC [M]  /root/RTL8811CU_for_Raspbian/hal/halmac/halmac_88xx/halmac_8821c/halmac_cfg_wmac_8821c.o
  CC [M]  /root/RTL8811CU_for_Raspbian/hal/halmac/halmac_88xx/halmac_8821c/halmac_common_8821c.o
  CC [M]  /root/RTL8811CU_for_Raspbian/hal/halmac/halmac_88xx/halmac_8821c/halmac_gpio_8821c.o
  CC [M]  /root/RTL8811CU_for_Raspbian/hal/halmac/halmac_88xx/halmac_8821c/halmac_init_8821c.o
  CC [M]  /root/RTL8811CU_for_Raspbian/hal/halmac/halmac_88xx/halmac_8821c/halmac_phy_8821c.o
  CC [M]  /root/RTL8811CU_for_Raspbian/hal/halmac/halmac_88xx/halmac_8821c/halmac_pwr_seq_8821c.o
  CC [M]  /root/RTL8811CU_for_Raspbian/hal/halmac/halmac_88xx/halmac_8821c/halmac_usb_8821c.o
  CC [M]  /root/RTL8811CU_for_Raspbian/hal/phydm/phydm_debug.o
  CC [M]  /root/RTL8811CU_for_Raspbian/hal/phydm/phydm_antdiv.o
  CC [M]  /root/RTL8811CU_for_Raspbian/hal/phydm/phydm_soml.o
  CC [M]  /root/RTL8811CU_for_Raspbian/hal/phydm/phydm_smt_ant.o
  CC [M]  /root/RTL8811CU_for_Raspbian/hal/phydm/phydm_antdect.o
  CC [M]  /root/RTL8811CU_for_Raspbian/hal/phydm/phydm_interface.o
  CC [M]  /root/RTL8811CU_for_Raspbian/hal/phydm/phydm_phystatus.o
  CC [M]  /root/RTL8811CU_for_Raspbian/hal/phydm/phydm_hwconfig.o
  CC [M]  /root/RTL8811CU_for_Raspbian/hal/phydm/phydm.o
  CC [M]  /root/RTL8811CU_for_Raspbian/hal/phydm/phydm_dig.o
  CC [M]  /root/RTL8811CU_for_Raspbian/hal/phydm/phydm_pathdiv.o
  CC [M]  /root/RTL8811CU_for_Raspbian/hal/phydm/phydm_rainfo.o
  CC [M]  /root/RTL8811CU_for_Raspbian/hal/phydm/phydm_dynamictxpower.o
  CC [M]  /root/RTL8811CU_for_Raspbian/hal/phydm/phydm_adaptivity.o
  CC [M]  /root/RTL8811CU_for_Raspbian/hal/phydm/phydm_cfotracking.o
  CC [M]  /root/RTL8811CU_for_Raspbian/hal/phydm/phydm_noisemonitor.o
  CC [M]  /root/RTL8811CU_for_Raspbian/hal/phydm/phydm_beamforming.o
  CC [M]  /root/RTL8811CU_for_Raspbian/hal/phydm/phydm_direct_bf.o
  CC [M]  /root/RTL8811CU_for_Raspbian/hal/phydm/phydm_dfs.o
  CC [M]  /root/RTL8811CU_for_Raspbian/hal/phydm/txbf/halcomtxbf.o
  CC [M]  /root/RTL8811CU_for_Raspbian/hal/phydm/txbf/haltxbfinterface.o
  CC [M]  /root/RTL8811CU_for_Raspbian/hal/phydm/txbf/phydm_hal_txbf_api.o
  CC [M]  /root/RTL8811CU_for_Raspbian/hal/phydm/phydm_adc_sampling.o
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  CC [M]  /root/RTL8811CU_for_Raspbian/hal/phydm/halrf/halrf_powertracking.o
  CC [M]  /root/RTL8811CU_for_Raspbian/hal/phydm/halrf/halrf_kfree.o
  CC [M]  /root/RTL8811CU_for_Raspbian/hal/phydm/halrf/halrf_psd.o
  CC [M]  /root/RTL8811CU_for_Raspbian/hal/phydm/rtl8821c/halhwimg8821c_bb.o
  CC [M]  /root/RTL8811CU_for_Raspbian/hal/phydm/rtl8821c/halhwimg8821c_mac.o
  CC [M]  /root/RTL8811CU_for_Raspbian/hal/phydm/rtl8821c/phydm_hal_api8821c.o
  CC [M]  /root/RTL8811CU_for_Raspbian/hal/phydm/rtl8821c/phydm_regconfig8821c.o
  CC [M]  /root/RTL8811CU_for_Raspbian/hal/phydm/halrf/rtl8821c/halhwimg8821c_rf.o
  CC [M]  /root/RTL8811CU_for_Raspbian/hal/phydm/halrf/rtl8821c/halrf_8821c.o
  CC [M]  /root/RTL8811CU_for_Raspbian/hal/phydm/halrf/rtl8821c/halrf_iqk_8821c.o
  CC [M]  /root/RTL8811CU_for_Raspbian/hal/btc/halbtc8821cwifionly.o
  CC [M]  /root/RTL8811CU_for_Raspbian/hal/btc/halbtc8821c1ant.o
  CC [M]  /root/RTL8811CU_for_Raspbian/hal/btc/halbtc8821c2ant.o
  CC [M]  /root/RTL8811CU_for_Raspbian/platform/platform_ops.o
  CC [M]  /root/RTL8811CU_for_Raspbian/core/rtw_mp.o
  LD [M]  /root/RTL8811CU_for_Raspbian/8821cu.o
  MODPOST /root/RTL8811CU_for_Raspbian/Module.symvers
ERROR: modpost: "__const_udelay" [/root/RTL8811CU_for_Raspbian/8821cu.ko] undefined!
ERROR: modpost: "__arch_copy_from_user" [/root/RTL8811CU_for_Raspbian/8821cu.ko] undefined!
ERROR: modpost: "_raw_spin_unlock" [/root/RTL8811CU_for_Raspbian/8821cu.ko] undefined!
ERROR: modpost: "__rcu_read_lock" [/root/RTL8811CU_for_Raspbian/8821cu.ko] undefined!
ERROR: modpost: "__rcu_read_unlock" [/root/RTL8811CU_for_Raspbian/8821cu.ko] undefined!
ERROR: modpost: "cpu_hwcap_keys" [/root/RTL8811CU_for_Raspbian/8821cu.ko] undefined!
ERROR: modpost: "csum_ipv6_magic" [/root/RTL8811CU_for_Raspbian/8821cu.ko] undefined!
ERROR: modpost: "__warn_printk" [/root/RTL8811CU_for_Raspbian/8821cu.ko] undefined!
ERROR: modpost: "arm64_const_caps_ready" [/root/RTL8811CU_for_Raspbian/8821cu.ko] undefined!
ERROR: modpost: "__udelay" [/root/RTL8811CU_for_Raspbian/8821cu.ko] undefined!
ERROR: modpost: "preempt_schedule_notrace" [/root/RTL8811CU_for_Raspbian/8821cu.ko] undefined!
ERROR: modpost: "__arch_copy_to_user" [/root/RTL8811CU_for_Raspbian/8821cu.ko] undefined!
make[2]: *** [scripts/Makefile.modpost:111: /root/RTL8811CU_for_Raspbian/Module.symvers] Error 1
make[2]: *** Deleting file '/root/RTL8811CU_for_Raspbian/Module.symvers'
make[1]: *** [Makefile:1708: modules] Error 2
make[1]: Leaving directory '/root/linux-3a33f11c48572b9dd0fecac164b3990fc9234da8'
make: *** [Makefile:2374: modules] Error 2

Does not work with RaspberryPi OS Kernel 6.1.21-v8+

$ make
make ARCH=arm CROSS_COMPILE= -C /lib/modules/6.1.21-v8+/build M=/home/pi/RTL8811CU_for_Raspbian  modules
make[1]: Entering directory '/home/pi/linux-0afb5e98488aed7017b9bf321b575d0177feb7ed'
  CC [M]  /home/pi/RTL8811CU_for_Raspbian/core/rtw_cmd.o
cc1: sorry, unimplemented: '-mfloat-abi=hard' and VFP
make[2]: *** [scripts/Makefile.build:250: /home/pi/RTL8811CU_for_Raspbian/core/rtw_cmd.o] Error 1
make[1]: *** [Makefile:2012: /home/pi/RTL8811CU_for_Raspbian] Error 2
make[1]: Leaving directory '/home/pi/linux-0afb5e98488aed7017b9bf321b575d0177feb7ed'
make: *** [Makefile:2503: modules] Error 2

dkms-install.sh missing in v5.8.1

His is about v5.8.1 branch which nearly works for Debian 11 on Raspberry Pi 4.

The dkms-install.sh script is missing in that branch but present in main branch. I am not sure but it looks also broken.
Can this be fixed even for the 5.8.1 branch.

With dkms-install I do not have to rebuild the module after each kernel update.

some warnings when "Make"

/home/pi/RTL8811CU_for_Raspbian/os_dep/linux/ioctl_mp.c: In function ‘rtw_mp_write_reg’:
/home/pi/RTL8811CU_for_Raspbian/os_dep/linux/ioctl_mp.c:46:2: warning: ISO C90 forbids variable length array ‘input’ [-Wvla]
char input[wrqu->length + 1];
^~~~
/home/pi/RTL8811CU_for_Raspbian/os_dep/linux/ioctl_mp.c: In function ‘rtw_mp_read_reg’:
/home/pi/RTL8811CU_for_Raspbian/os_dep/linux/ioctl_mp.c:132:2: warning: ISO C90 forbids variable length array ‘input’ [-Wvla]
char input[wrqu->length + 1];
^~~~
/home/pi/RTL8811CU_for_Raspbian/os_dep/linux/ioctl_mp.c: In function ‘rtw_mp_write_rf’:
/home/pi/RTL8811CU_for_Raspbian/os_dep/linux/ioctl_mp.c:266:2: warning: ISO C90 forbids variable length array ‘input’ [-Wvla]
char input[wrqu->length];
^~~~
/home/pi/RTL8811CU_for_Raspbian/os_dep/linux/ioctl_mp.c: In function ‘rtw_mp_read_rf’:
/home/pi/RTL8811CU_for_Raspbian/os_dep/linux/ioctl_mp.c:308:2: warning: ISO C90 forbids variable length array ‘input’ [-Wvla]
char input[wrqu->length];
^~~~
/home/pi/RTL8811CU_for_Raspbian/os_dep/linux/ioctl_mp.c: In function ‘rtw_mp_rate’:
/home/pi/RTL8811CU_for_Raspbian/os_dep/linux/ioctl_mp.c:413:2: warning: ISO C90 forbids variable length array ‘input’ [-Wvla]
u8 input[wrqu->length + 1];
^~
/home/pi/RTL8811CU_for_Raspbian/os_dep/linux/ioctl_mp.c: In function ‘rtw_mp_channel’:
/home/pi/RTL8811CU_for_Raspbian/os_dep/linux/ioctl_mp.c:463:2: warning: ISO C90 forbids variable length array ‘input’ [-Wvla]
u8 input[wrqu->length + 1];
^~
/home/pi/RTL8811CU_for_Raspbian/os_dep/linux/ioctl_mp.c: In function ‘rtw_mp_ch_offset’:
/home/pi/RTL8811CU_for_Raspbian/os_dep/linux/ioctl_mp.c:490:2: warning: ISO C90 forbids variable length array ‘input’ [-Wvla]
u8 input[wrqu->length + 1];
^~
/home/pi/RTL8811CU_for_Raspbian/os_dep/linux/ioctl_mp.c: In function ‘rtw_mp_bandwidth’:
/home/pi/RTL8811CU_for_Raspbian/os_dep/linux/ioctl_mp.c:517:2: warning: ISO C90 forbids variable length array ‘input’ [-Wvla]
u8 input[wrqu->length];
^~
/home/pi/RTL8811CU_for_Raspbian/os_dep/linux/ioctl_mp.c: In function ‘rtw_mp_txpower_index’:
/home/pi/RTL8811CU_for_Raspbian/os_dep/linux/ioctl_mp.c:550:2: warning: ISO C90 forbids variable length array ‘input’ [-Wvla]
char input[wrqu->length + 1];
^~~~
/home/pi/RTL8811CU_for_Raspbian/os_dep/linux/ioctl_mp.c: In function ‘rtw_mp_txpower’:
/home/pi/RTL8811CU_for_Raspbian/os_dep/linux/ioctl_mp.c:596:2: warning: ISO C90 forbids variable length array ‘input’ [-Wvla]
u8 input[wrqu->length];
^~
/home/pi/RTL8811CU_for_Raspbian/os_dep/linux/ioctl_mp.c: In function ‘rtw_mp_ant_tx’:
/home/pi/RTL8811CU_for_Raspbian/os_dep/linux/ioctl_mp.c:634:2: warning: ISO C90 forbids variable length array ‘input’ [-Wvla]
u8 input[wrqu->length + 1];
^~
/home/pi/RTL8811CU_for_Raspbian/os_dep/linux/ioctl_mp.c: In function ‘rtw_mp_ant_rx’:
/home/pi/RTL8811CU_for_Raspbian/os_dep/linux/ioctl_mp.c:682:2: warning: ISO C90 forbids variable length array ‘input’ [-Wvla]
u8 input[wrqu->length + 1];
^~
/home/pi/RTL8811CU_for_Raspbian/os_dep/linux/ioctl_mp.c: In function ‘rtw_mp_disable_bt_coexist’:
/home/pi/RTL8811CU_for_Raspbian/os_dep/linux/ioctl_mp.c:862:2: warning: ISO C90 forbids variable length array ‘input’ [-Wvla]
u8 input[wrqu->data.length + 1];
^~
/home/pi/RTL8811CU_for_Raspbian/os_dep/linux/ioctl_mp.c: In function ‘rtw_mp_arx’:
/home/pi/RTL8811CU_for_Raspbian/os_dep/linux/ioctl_mp.c:900:2: warning: ISO C90 forbids variable length array ‘input’ [-Wvla]
u8 input[wrqu->length];
^~
/home/pi/RTL8811CU_for_Raspbian/os_dep/linux/ioctl_mp.c: In function ‘rtw_mp_pwrtrk’:
/home/pi/RTL8811CU_for_Raspbian/os_dep/linux/ioctl_mp.c:1085:2: warning: ISO C90 forbids variable length array ‘input’ [-Wvla]
u8 input[wrqu->length];
^~
/home/pi/RTL8811CU_for_Raspbian/os_dep/linux/ioctl_mp.c: In function ‘rtw_mp_psd’:
/home/pi/RTL8811CU_for_Raspbian/os_dep/linux/ioctl_mp.c:1123:2: warning: ISO C90 forbids variable length array ‘input’ [-Wvla]
u8 input[wrqu->length + 1];
^~
/home/pi/RTL8811CU_for_Raspbian/os_dep/linux/ioctl_mp.c: In function ‘rtw_mp_dump’:
/home/pi/RTL8811CU_for_Raspbian/os_dep/linux/ioctl_mp.c:1244:2: warning: ISO C90 forbids variable length array ‘input’ [-Wvla]
u8 input[wrqu->length];
^~
/home/pi/RTL8811CU_for_Raspbian/os_dep/linux/ioctl_mp.c: In function ‘rtw_mp_phypara’:
/home/pi/RTL8811CU_for_Raspbian/os_dep/linux/ioctl_mp.c:1268:2: warning: ISO C90 forbids variable length array ‘input’ [-Wvla]
char input[wrqu->length];
^~~~
/home/pi/RTL8811CU_for_Raspbian/os_dep/linux/ioctl_mp.c: In function ‘rtw_mp_SetRFPath’:
/home/pi/RTL8811CU_for_Raspbian/os_dep/linux/ioctl_mp.c:1294:2: warning: ISO C90 forbids variable length array ‘input’ [-Wvla]
char input[wrqu->length];
^~~~
/home/pi/RTL8811CU_for_Raspbian/os_dep/linux/ioctl_mp.c: In function ‘rtw_mp_switch_rf_path’:
/home/pi/RTL8811CU_for_Raspbian/os_dep/linux/ioctl_mp.c:1345:2: warning: ISO C90 forbids variable length array ‘input’ [-Wvla]
char input[wrqu->length];
^~~~
/home/pi/RTL8811CU_for_Raspbian/os_dep/linux/ioctl_mp.c: In function ‘rtw_mp_QueryDrv’:
/home/pi/RTL8811CU_for_Raspbian/os_dep/linux/ioctl_mp.c:1394:2: warning: ISO C90 forbids variable length array ‘input’ [-Wvla]
char input[wrqu->data.length];
^~~~
/home/pi/RTL8811CU_for_Raspbian/os_dep/linux/ioctl_mp.c: In function ‘rtw_mp_PwrCtlDM’:
/home/pi/RTL8811CU_for_Raspbian/os_dep/linux/ioctl_mp.c:1423:2: warning: ISO C90 forbids variable length array ‘input’ [-Wvla]
u8 input[wrqu->length];
^~
/home/pi/RTL8811CU_for_Raspbian/os_dep/linux/ioctl_mp.c: In function ‘rtw_mp_hwtx’:
/home/pi/RTL8811CU_for_Raspbian/os_dep/linux/ioctl_mp.c:2073:2: warning: ISO C90 forbids variable length array ‘input’ [-Wvla]
u8 input[wrqu->data.length];
^~

Test report: Works with Debian 12 "Bookworm" (raspi.debian.net) on Raspberry Pi 4

In addition to #8 I would like to report how this works on Debian 12.

This repo do not work because there is no net/ipx.h. Not sure what it is or where it comes from.

I checked the forks of that repo and found https://github.com/andrewdbinder/RTL8811CU_for_Raspbian which seems to deal with that problem.

usb disconnects after link ready

Hi, after installation, I got messages from dmesg below:

...
[  940.082006] start_addr=(0x8000), end_addr=(0x10000), buffer_size=(0x8000), smp_number_max=(4096)
[  940.323982] IPv6: ADDRCONF(NETDEV_CHANGE): wlan0: link becomes ready
[  940.388446] usb 1-1.3: USB disconnect, device number 84
[  940.727795] usb 1-1.3: new high-speed USB device number 85 using dwc_otg
[  940.859670] usb 1-1.3: New USB device found, idVendor=0bda, idProduct=c811, bcdDevice= 2.00
[  940.859715] usb 1-1.3: New USB device strings: Mfr=1, Product=2, SerialNumber=3
[  940.859736] usb 1-1.3: Product: 802.11ac NIC
[  940.859754] usb 1-1.3: Manufacturer: Realtek
[  940.859773] usb 1-1.3: SerialNumber: 123456
[  945.191768] start_addr=(0x8000), end_addr=(0x10000), buffer_size=(0x8000), smp_number_max=(4096)
[  945.256394] IPv6: ADDRCONF(NETDEV_CHANGE): wlan0: link becomes ready
[  945.510315] usb 1-1.3: USB disconnect, device number 85
[  945.867762] usb 1-1.3: new high-speed USB device number 86 using dwc_otg
[  945.999979] usb 1-1.3: New USB device found, idVendor=0bda, idProduct=c811, bcdDevice= 2.00
[  946.000024] usb 1-1.3: New USB device strings: Mfr=1, Product=2, SerialNumber=3
[  946.000047] usb 1-1.3: Product: 802.11ac NIC
[  946.000069] usb 1-1.3: Manufacturer: Realtek
[  946.000090] usb 1-1.3: SerialNumber: 123456
[  948.721418] start_addr=(0x8000), end_addr=(0x10000), buffer_size=(0x8000), smp_number_max=(4096)
[  948.787745] IPv6: ADDRCONF(NETDEV_CHANGE): wlan0: link becomes ready
[  949.095309] usb 1-1.3: USB disconnect, device number 86
[  949.427722] usb 1-1.3: new high-speed USB device number 87 using dwc_otg
[  949.560146] usb 1-1.3: New USB device found, idVendor=0bda, idProduct=c811, bcdDevice= 2.00
[  949.560190] usb 1-1.3: New USB device strings: Mfr=1, Product=2, SerialNumber=3
[  949.560217] usb 1-1.3: Product: 802.11ac NIC
[  949.560238] usb 1-1.3: Manufacturer: Realtek
[  949.560257] usb 1-1.3: SerialNumber: 123456
[  953.301688] start_addr=(0x8000), end_addr=(0x10000), buffer_size=(0x8000), smp_number_max=(4096)
[  953.369690] IPv6: ADDRCONF(NETDEV_CHANGE): wlan0: link becomes ready
[  953.705357] usb 1-1.3: USB disconnect, device number 87
[  954.067721] usb 1-1.3: new high-speed USB device number 88 using dwc_otg
[  954.199523] usb 1-1.3: New USB device found, idVendor=0bda, idProduct=c811, bcdDevice= 2.00
[  954.199567] usb 1-1.3: New USB device strings: Mfr=1, Product=2, SerialNumber=3
[  954.199630] usb 1-1.3: Product: 802.11ac NIC
[  954.199654] usb 1-1.3: Manufacturer: Realtek
[  954.199674] usb 1-1.3: SerialNumber: 123456
[  957.911199] start_addr=(0x8000), end_addr=(0x10000), buffer_size=(0x8000), smp_number_max=(4096)
[  957.977557] IPv6: ADDRCONF(NETDEV_CHANGE): wlan0: link becomes ready
[  958.314459] usb 1-1.3: USB disconnect, device number 88
[  958.677619] usb 1-1.3: new high-speed USB device number 89 using dwc_otg
[  958.809408] usb 1-1.3: New USB device found, idVendor=0bda, idProduct=c811, bcdDevice= 2.00
[  958.809450] usb 1-1.3: New USB device strings: Mfr=1, Product=2, SerialNumber=3
[  958.809474] usb 1-1.3: Product: 802.11ac NIC
[  958.809536] usb 1-1.3: Manufacturer: Realtek
[  958.809558] usb 1-1.3: SerialNumber: 123456
[  962.612974] start_addr=(0x8000), end_addr=(0x10000), buffer_size=(0x8000), smp_number_max=(4096)
[  962.677296] IPv6: ADDRCONF(NETDEV_CHANGE): wlan0: link becomes ready
[  963.691396] usb 1-1.3: USB disconnect, device number 89
[  964.047510] usb 1-1.3: new high-speed USB device number 90 using dwc_otg
[  964.179436] usb 1-1.3: New USB device found, idVendor=0bda, idProduct=c811, bcdDevice= 2.00
[  964.179477] usb 1-1.3: New USB device strings: Mfr=1, Product=2, SerialNumber=3
[  964.179542] usb 1-1.3: Product: 802.11ac NIC
[  964.179567] usb 1-1.3: Manufacturer: Realtek
[  964.179587] usb 1-1.3: SerialNumber: 123456
[  964.972427] usb 1-1.3: USB disconnect, device number 90
...

My environment:

$ uname -a
Linux raspberrypi-1b 5.10.103+ #1529 Tue Mar 8 12:19:18 GMT 2022 armv6l GNU/Linux

Could you please help me check what's the problem?