lasertooth / rpikernel

Sources of the current kernel used for the DroneBridge Raspberry Pi images & its patch files

RPiKernel

Sources of the current kernel used for the DroneBridge Raspberry Pi images & its patch files. Kernel source files contain the https://github.com/aircrack-ng/rtl8812au driver. It is experimental and not patched to output max power. Current branch is 5.20.x. You might want to update the files in the /drivers/net/wireless/rtl8812au folder

Building (cross compile)

Compile for Armv6 (Pi0) & Armv7 (Pi2+) using the instructions given here:

• https://www.raspberrypi.org/documentation/linux/kernel/building.md
• https://www.raspberrypi.org/documentation/linux/kernel/configuring.md

Copy the db.txt to drivers/net/wireless and enable CONFIG_CFG80211_INTERNAL_REGDB=y in the .conf files, if you want to built a new kernel without using the provided source code under "releases" in this repository.

1. Rename the provided config files for both architectures to .conf depending what kernel you are building and copy them to the root folder of the sources (/linux/.conf).
2. KERNEL=kernel or KERNEL=kernel7
3. make ARCH=arm CROSS_COMPILE=arm-linux-gnueabihf- menuconfig to configure the kernel for your needs
4. Compile the kernel using make ARCH=arm CROSS_COMPILE=arm-linux-gnueabihf- zImage modules dtbs -j 8 where 8 is your CPU core count
5. Use the correct location of your mounted SD card/DroneBridge patitions (see raspberrypi.org docs). We use /dev/sddx here:

mkdir mnt
mkdir mnt/fat32
mkdir mnt/ext4
sudo mount /dev/sdd1 mnt/fat32
sudo mount /dev/sdd2 mnt/ext4
sudo make ARCH=arm CROSS_COMPILE=arm-linux-gnueabihf- INSTALL_MOD_PATH=mnt/ext4 modules_install
sudo cp arch/arm/boot/zImage mnt/fat32/$KERNEL.img
sudo cp arch/arm/boot/dts/*.dtb mnt/fat32/
sudo cp arch/arm/boot/dts/overlays/*.dtb* mnt/fat32/overlays/
sudo cp arch/arm/boot/dts/overlays/README mnt/fat32/overlays/
sudo umount mnt/fat32
sudo umount mnt/ext4

How to apply patches

To apply the patches copy the .patch file to the kernel root src directory run patch -p0 < db_kernel_xxx.patch

Credits

• Initial patches provided by rodizio1 in the EZ-Wifibroadcast project
• Updated patches, move to Kernel 4.14.66 and integration of aircrack-ng/rtl8812au driver for DroneBridge by seeul8er