Kernel compilation

The following takes linux-6.6 as an example to introduce how to compile your own kernel for Bianbu, supporting cross-compilation (fast) and local compilation (convenient).

Download source code

git clone https://gitee.com/bianbu-linux/linux-6.6 ~/linux-6.

Cross-compilation

Development environment

Run the command sudo apt-get install asciidoc xmlto to install asciidoc xmlto .

Compiler

Address: http://archive.spacemit.com/toolchain/

1. Download the cross compiler:

For example, spacemit-toolchain-linux-glibc-x86_64-v1.0.0.tar.xz

2. Unzip:

sudo tar -Jxf /path/to/spacemit-toolchain-linux-glibc-x86_64-v1.0.0.tar.xz -C /opt

Tip: /opt is the path where you unzipped the files, or you can choose your own path.

3. Set the cross compiler environment variable:

export PATH=/path/to/spacemit-toolchain-linux-glibc-x86_64-v1.0.0/bin:$PATH

Tip: /path/to/ is the path where you unzipped the files, such as / opt .

Compile the software package

1. Run the command cd ~/linux-6.6 to enter the kernel source directory.

2. Set the kernel compilation parameters:

export CROSS_COMPILE=riscv64-unknown-linux-gnu-
export ARCH=riscv
export LOCALVERSION=""

3. Run the command make k1_defconfig to generate the default configuration.

4. Modify the configuration. If you do not want to change, you can skip:

make menuconfig

5. To save the modified configuration:

make savedefconfig
mv defconfig arch/riscv/configs/k1_defconfig

6. Run the command make -j$(nproc) bindeb-pkg to compile the debian package.

When you see the following information, it means that the compilation is successful.

dpkg-genchanges: info: binary-only upload (no source code included)
dpkg-source --after-build .
dpkg-buildpackage: info: binary-only upload (no source included)

The software package is located in the upper directory, commonly used packages:

• linux-image-6.6.36_6.6.36-*.deb

Kernel Image software package.

• linux-tools-6.6.36_6.6.36-*.deb

Tool software packages such as perf.

7. Copy to the device, install and reboot:

sudo dpkg -i linux-image-6.6.36_6.6.36-*.deb
sudo reboot

Compile modules

Compile modules outside the kernel source tree, taking rtl8852bs as an example, the general command is as follows:

cd /path/to/rtl8852bs
make -j$(nproc) -C ~/linux-6.6 M=/path/to/rtl8852bs modules

Tip: /path/to/rtl8852bs should be replaced with your path.

Cleanup command:

make -j$(nproc) -C ~/linux-6.6 M=/path/to/rtl8852bs clean

Compile device tree

make -j$(nproc) dtbs

If the compilation fails, run the command make ARCH=riscv menuconfig, enter the kernel, and change SOC_SPACEMIT [=n] to SOC_SPACEMIT [=y].

Then recompile the device tree.

Local compilation

You can compile the kernel directly on Bianbu. The following is a guide.

Development environment

Installation dependencies:

sudo apt-get install flex bison libncurses-dev debhelper libssl-dev u-boot-tools libpfm4-dev libpfm4-dev libtraceevent-dev asciidoc

Compile software package

1. Run the command cd ~/linux-6.6 to enter the kernel source directory.

2. Set kernel compilation parameters:

export ARCH=riscv
export LOCALVERSION=""

3. Run the command make k1_defconfig to generate the default configuration.

4. Modify the configuration. If you do not want to change, you can skip:

make menuconfig

5. To save the modified configuration:

make savedefconfig
mv defconfig arch/riscv/configs/k1_defconfig

6. Run the command make -j$(nproc) bindeb-pkg to compile the debian package.

When you see the following information, the compilation is successful.

dpkg-genchanges: info: binary-only upload (no source code included)
dpkg-source --after-build .
dpkg-buildpackage: info: binary-only upload (no source included)

The software package is located in the upper directory. Common packages:

• linux-image-6.6.36_6.6.36-*.deb

Kernel Image software package.

• linux-tools-6.6.36_6.6.36-*.deb

perf and other tool software packages.

7. Install and reboot:

sudo dpkg -i linux-image-6.6.36_6.6.36-*.deb
sudo reboot

Compile modules

Locally compile modules outside the kernel source tree without relying on the kernel source code.

First install linux-headers:

sudo apt-get install linux-headers-`uname -r`

Then compile modules, such as rtl8852bs:

cd /path/to/rtl8852bs
make -j$(nproc) -C /lib/modules/`uname -r`/build M=/path/to/rtl8852bs modules

Tip: /path/to/rtl8852bs should be replaced with your path.

Cleanup command:

make -j$(nproc) -C /lib/modules/`uname -r`/build M=/path/to/rtl8852bs clean