Method 2: Adding Startup Item

To replace dtb file by adding a startup item, perform the following:

Execute the following commands under the root directory of Linux:
```
sudo cp arch/riscv/boot/dts/starfive/<dtb_file> <Mount_Direcotry>/boot/dtbs/
```
Tip:
- <dtb_file> refers to the dtb file name. Different boards use different dtb files. For more information, see dtb Files table in this document.
- <Mount_Directory> refers to the actual mount directory. For example, /media/jianlong.
Example Command:
```
sudo cp arch/riscv/boot/dts/starfive/jh7100-starfive-visionfive-v1.dtb /media/jianlong/__boot/dtbs/
```
Enter SD card mount directory:
```
cd <Mount_Direcotry>/__boot
```
Tip:
<Mount_Directory> refers to the actual mount directory. For example, /media/jianlong.
Update grub.cfg:
```
sudo gedit grub.cfg
```
Add the following command lines, save and exit:
```
menuentry 'MY Fedora vmlinux-5.14.0+' {
linux /vmlinuz-5.14.0+ ro root=UUID=f852f7f6-aa4e-4404-8ea9-439568b767a1 rhgb console=tty0 console=ttyS0,115200 earlycon rootwait stmmaceth=chain_mode:1 selinux=0 
LANG=en_US.UTF-8
devicetree /dtbs/<dtb_File>
initrd /initramfs-<Kernel_Version>.img
}
```
Tip:
In these command lines:
- <dtb_file> refers to the dtb file name. Different boards use different dtb files. For more information, see dtb Files table in this document.
- <Kernel_Version>: the kernel version number. For example, 5.14.0+.
- MY Fedora vmlinux-5.14.0: Configurable menu item name.
When the grub menu occurs, select the menu item set in the previous step, for example, MY Fedora vmlinux-5.14.0+, during startup.

Tip: Multiple startup items can be added according to the actual number of dtb files.