Compile Linux (Cross Compile)

Follow the steps below to cross compile Linux:

Execute the following to install dependencies and create kernel:

apt-get install build-essential linux-source bc kmod cpio flex libncurses5-dev libelf-dev libssl-dev dwarves bison git

Checkout the kernel files from StarFive GitHub:

git clone https://github.com/starfive-tech/linux

Execute the following command to switch to code branch:

cd linux
git checkout -b JH7110_VisionFive2_devel origin/JH7110_VisionFive2_devel
git pull

Execute the following command to set the default configuration of compiling Linux kernel:
```
make <Configuration_File> CROSS_COMPILE=riscv64-linux-gnu- ARCH=riscv
```
Tip: <Configuration_File>: This file is starfive_visionfive2_defconfig on VisionFive 2.
Execute the following command to set other software configuration of compiling Linux kernel:
```
make CROSS_COMPILE=riscv64-linux-gnu- ARCH=riscv menuconfig
```
Compile Linux Kernel:
```
make CROSS_COMPILE=riscv64-linux-gnu- ARCH=riscv -jx
```
Note: Here you need to change the -jx value according to the number of cores in your CPU. If your CPU has 8 cores, change this to -j8. This process will take some time and therefore please wait patiently. This process is quite time-consuming, please be patient and wait.
Result:
The system will generate the kernel image file Image.gz under linux/arch/riscv/boot directory.
Figure 1. Example Output

The system will generate the dtb file Image.gz under linux/arch/riscv/boot directory.
Figure 2. Generating dtb

When porting rootfs, dtb, and kernel to VisionFive 2, Image.gz and .dtb files will be used.