How to plan the porting

According to the boot flow described in Fig. 90, some required packages are clear: U-Boot, OP-TEE, TF-A, and the Linux Kernel. The recommendation is to start with the porting of these packages directly after creating a machine configuration file.

Once the basic integration is complete, make sure to enable additional features, including the firmware not critical for boot, such as Bluetooth or Wi-Fi firmware. Next, port any applications, and continue development as needed.

In short, the recommended order is:

1. Machine configuration file
2. SPL and U-Boot proper
3. OP-TEE and TF-A
4. Linux Kernel

Note

It is recommended to use DISTRO=lmp-base during the porting task.

Next in this guide, each of the steps listed are detailed, focusing on the recommendations to work with each package. It is important to note that there are use cases when a board has peculiarities which may not be listed here, but it is important to understand and cover them during the port.