===== Compile qcacld driver for RaspberryPi =====

Before compiling qcacld drivers for RaspberryPi, you have to prepare kernel. Here is official guide:

  * [[https://www.raspberrypi.org/documentation/linux/kernel/building.md|Kernel building]]

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=== Install Raspbian Stretch Lite to sdcard ===

1. Download Raspbian Stretch Lite image from [[https://www.raspberrypi.org/downloads/raspbian/|Raspberry official site]]

2. Unzip the image:
   unzip 2018-11-13-raspbian-stretch-lite.zip

3. Write the sdcard
 Insert SD card and check the name
  sudo fdisk -l
 In our case, the sdcard was named /dev/mmcblk0, then
  sudo dd if=2018-11-13-raspbian-stretch-lite.img of=/dev/mmcblk0

4. **Optional** Enable ssh
 Mount the sdcard boot partition
  sudo mount /dev/mmcblk0p1 /mnt
 Create file, [[https://www.raspberrypi.org/documentation/remote-access/ssh/|that enables ssh]]
  sudo touch /mnt/ssh
 Unmount the partition
  sudo umount /mnt
  
=== Building the sources ===

1. Download sources
  mkdir RaspberryPi_Beans; cd RaspberryPi_Beans
  git clone https://github.com/raspberrypi/tools
  git clone https://github.com/raspberrypi/linux -b rpi-4.11.y
  git clone https://github.com/8devices/qcacld-2.0/ -b CNSS.LEA.NRT_3.0

2. Add toolchain to PATH
  export PATH=$PATH:$PWD/tools/arm-bcm2708/gcc-linaro-arm-linux-gnueabihf-raspbian-x64/bin

3. Prepare Linux
  cd linux
  KERNEL=kernel7
  make ARCH=arm CROSS_COMPILE=arm-linux-gnueabihf- bcm2709_defconfig

 Enable nl80211 test mode

  make ARCH=arm CROSS_COMPILE=arm-linux-gnueabihf- menuconfig

  Networking support -> Wireless -> nl80211 testmode command
 
 Save and exit.

4. Patch kernel
  for i in ../qcacld-2.0/patches/kernel/v4.11/0* ; do patch -p1 < $i ; done

5. Build kernel
  make ARCH=arm CROSS_COMPILE=arm-linux-gnueabihf- zImage modules dtbs -j$(nproc)
  
6. Patch qcacld
  cd ../qcacld-2.0/
  
 Patch the sources

  patch -p1 < patches/RaspberryPi/0001-destructor_rename.patch

7. Build qcacld

  KERNEL_SRC=../linux/ ARCH=arm CROSS_COMPILE=arm-linux-gnueabihf- make -j$(nproc)
  cd ..

=== Booting image ===

1. Mount boot partition

  sudo mount /dev/mmcblk0p1 /mnt
  
2. Transfer the kernel and device tree

  cd linux
  sudo cp /mnt/kernel7.img /mnt/kernel7-backup.img
  sudo cp arch/arm/boot/zImage /mnt/kernel7.img
  sudo cp arch/arm/boot/dts/*.dtb /mnt/
  sudo cp arch/arm/boot/dts/overlays/*.dtb* /mnt/overlays/
  sudo cp arch/arm/boot/dts/overlays/README /mnt/overlays/

3. Edit ''/boot/config.txt''
  
  echo core_freq=250 | sudo tee --append /mnt/config.txt
  echo dtoverlay=sdio,poll_once=false | sudo tee --append /mnt/config.txt
  
4. Unmount the partition

  sudo umount /mnt
  
5. Install modules

  sudo mount /dev/mmcblk0p2 /mnt
  sudo make ARCH=arm CROSS_COMPILE=arm-linux-gnueabihf- INSTALL_MOD_PATH=/mnt/ modules_install
  cd ../qcacld-2.0/
  sudo cp *.ko /mnt/home/pi/
  sudo cp -r firmware_bin/sdio/* /mnt/lib/firmware/
  sudo umount /mnt
  
6. Boot the image

 Insert the sdcard into Raspberry and power it up.
 Connect the device to the Raspberry and load module with command

  sudo insmod wlan-sdio.ko
  
 The interface should appear:

  pi@raspberrypi:~ $ ip l
  1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN mode DEFAULT group default qlen 1000
  	link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
  2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP mode DEFAULT group default qlen 1000
  	link/ether b8:27:eb:53:d0:9c brd ff:ff:ff:ff:ff:ff
  3: wlan0: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc pfifo_fast state DOWN mode DORMANT group default qlen 1000
  	link/ether b8:27:eb:06:85:c9 brd ff:ff:ff:ff:ff:ff
  8: wlan1: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc mq state DOWN mode DORMANT group default qlen 3000
  	link/ether c4:93:00:0f:7e:58 brd ff:ff:ff:ff:ff:ff
  9: p2p0: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc mq state DOWN mode DORMANT group default qlen 3000
  	link/ether c6:93:00:90:7e:58 brd ff:ff:ff:ff:ff:ff