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Yesterday in the technical group, a newcomer asked a question: “I see on recruitment platforms that some companies are looking for Linux driver engineers, while others are looking for BSP engineers. What is the difference between them?” This question unexpectedly sparked a lot of discussion among the experienced engineers who had been silent.

An engineer with over ten years of experience simply said: “BSP is the contractor, and the driver is the plumber.” This statement made everyone laugh, but it is indeed a vivid analogy.

First, let’s talk about what driver development is

In simple terms, a driver is a program that allows the operating system to “communicate” with hardware devices. Without a driver, the Linux system cannot recognize what your hardware is.

For example, if you buy a new camera and plug it into the development board, the Linux system will be confused: “What is this?” At this point, you need to write a driver to inform the system: “Hey, this is a camera, you can call it like this…”

Driver engineers deal with various hardware on a daily basis: GPIO, I2C, SPI, USB, network cards, displays… They focus on how a single hardware component works and how to ensure the system correctly recognizes and uses this specific device.

For example, a driver engineer might focus on:

• Writing input device drivers for a new type of touchscreen

• Debugging the image capture functionality of a camera sensor

• Optimizing the performance of an audio codec driver

So what does BSP do?

BSP (Board Support Package) is a basic software package provided for an entire development board. As the name suggests, it is the foundational software package for a complete development board.

If driver engineers are “experts” focused on individual hardware, then BSP engineers are the “architects” who grasp the overall picture. They need to consider how all the hardware on the board works together and how to ensure the operating system runs properly on a specific hardware platform.

The scope of work for BSP engineers is broader:

• Customizing the Uboot bootloader to ensure the system can start normally

• Configuring the Linux kernel and selecting components suitable for the current hardware

• Integrating various hardware drivers and resolving resource conflicts

• Porting the operating system to new hardware platforms

• Debugging various issues during the system startup process

A metaphor to help you understand instantly

Imagine renovating a house:

• Driver development is like the various skilled workers: plumbers, electricians, masons, each responsible for their specialized part

• BSP development is like the project manager or contractor, coordinating all trades to ensure the entire renovation project proceeds smoothly

BSP engineers need to understand the knowledge of various drivers, but more importantly, they must have a system-level perspective to know how to make all these components work harmoniously together.

Differences in actual development

In practice, driver engineers often focus more on:

• Deeply studying the data sheets of specific hardware

• Writing efficient and stable device drivers

• Resolving specific device anomalies

Meanwhile, BSP engineers need to:

• Understand the entire system startup process

• Be familiar with kernel configuration and compilation

• Resolve resource conflicts between different hardware

• Conduct system-level debugging and optimization

Of course, in actual work, there are often many overlaps between these two roles. Many engineers write drivers and also handle BSP porting. Especially in small companies, one person may take on all these tasks.

How to choose a learning direction?

If you are a beginner, I suggest:

1. Start with driver development to understand how individual hardware works

2. Then try to integrate multiple drivers and resolve resource conflicts

3. Finally, learn about the system startup process and kernel configuration, moving towards BSP development

Driver development is foundational, while BSP reflects comprehensive capabilities. Regardless of which direction you choose, knowledge of underlying hardware, understanding of the Linux kernel, and proficiency in C programming are essential.

After all this, whether it is drivers or BSP, both are very important skills in the embedded Linux field. The key is to find the direction you are interested in and delve deeply into it. After all, in this field, mastering one skill can lead to many opportunities, and being proficient in any direction can lead to great development.

For those of you looking for jobs, do you now understand which position to apply for? Remember to make choices based on your skills and interests!

If this was helpful, feel free to like, comment, and share~ See you next time!

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