rtl8xxxu_rk_5.10

rtl8xxxu usb wifi driver, for rockchip rk3588 bsp kernel 5.10.
Cause bsp kernel lacks support of RTL8188F usb wifi module, so I have backported it from 6.2.
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Integrate to existing BSP tree

Copy all sources to drivers/net/wireless/realtek/rtl8xxxu.
make menuconfig，enable CONFIG_RTL8XXXU.
Then simply build your kernel.

Build out-of-tree module on your board

Make sure you have kernel headers installed;
Armbian users can install it using following command:

sudo apt install -y linux-headers-legacy-rk35xx

build the module:

make CONFIG_RTL8XXXU=m -C /lib/modules/`uname -r`/build M=`pwd` modules

rtl8xxxu.ko will appears in current directory.
You can load it using insmod rtl8xxxu.ko.
If you wish autoload module when USB wifi adapter plugged in, you can run the following command:

sudo cp rtl8xxxu.ko /lib/modules/`uname -r`/kernel/drivers/net/wireless/rtl8xxxu
sudo depmod

reboot, that's it.

Installing firmware

Copy rtl8188fufw.bin file to /lib/firmware/rtlwifi/ directory.

Testing

My USB WiFi adapter is RTL8188FTV USB Dongle，use lsusb to inspect it:

Bus 007 Device 002: ID 0bda:f179 Realtek Semiconductor Corp. RTL8188FTV 802.11b/g/n 1T1R 2.4G WLAN Adapter

Then plug it into your board, dmesg prints:

[   50.883071] usb 7-1: new high-speed USB device number 2 using xhci-hcd
[   51.024006] usb 7-1: New USB device found, idVendor=0bda, idProduct=f179, bcdDevice= 0.00
[   51.024037] usb 7-1: New USB device strings: Mfr=1, Product=2, SerialNumber=3
[   51.024057] usb 7-1: Product: 802.11n
[   51.024076] usb 7-1: Manufacturer: Realtek
[   51.024095] usb 7-1: SerialNumber: ************
[   51.205709] usb 7-1: Vendor: Realtek
[   51.205718] usb 7-1: Product: 802.11n

when module loaded, dmesg prints:

[   51.205723] usb 7-1: rtl8188fu_parse_efuse: dumping efuse (0x200 bytes):
# massive efuse registers
[   51.205991] usb 7-1: RTL8188FU rev B (SMIC) 1T1R, TX queues 2, WiFi=1, BT=0, GPS=0, HI PA=0
[   51.205996] usb 7-1: RTL8188FU MAC: **:**:**:**:**:**
[   51.206000] usb 7-1: rtl8xxxu: Loading firmware rtlwifi/rtl8188fufw.bin
[   51.210598] usb 7-1: Firmware revision 4.0 (signature 0x88f1)
[   52.313334] usbcore: registered new interface driver rtl8xxxu
[   52.327916] rtl8xxxu 7-1:1.0 wlx************: renamed from wlan0

you can use ip addr command to see the wireless interface:

6: wlx************: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc mq state DOWN group default qlen 1000
    link/ether **:**:**:**:**:** brd ff:ff:ff:ff:ff:ff

Finally you can use your favorite wireless management tool(wpa_supplicant/nmcli/nmtui/Advanced Network Configuration) to connect WiFi.

Enable HT40 Support

/etc/modprobe.d/rt8xxxu.conf:

options rtl8xxxu ht40_2g=1

After enable this param on my hardware, Transfer speed increased from 3MB/s to 5MB/s in my local network.