Why need firmware customization
Mainly to save memory.
The memory of the chip is
6MiB general purpose memory +
2MiB AI dedicated memory, which is really very large compared to ordinary single-chip microcomputers. If AI function is not used, we can use the entire
But because many times we need to run a model, a model may reach
3MiB or even larger, and the firmware also needs to take up memory.
So in order to run a larger model, we need to compromise and cut some unnecessary functions.
In the previous chapter of firmware update, many firmware versions were introduced and compiled, including
These firmwares may be used in different situations. such as:
Cut IDE code, if you don't need to connect MaixPy IDE, you can cut IDE part to save memory.
Cut the OpenMV function, the firmware is compatible with some functions of OpenMV, if you use the model, these functions may not be needed, you can cut it out.
Tailoring multithreading support, if you don't need multithreading support, you can trim this part to get more memory space.
Therefore, if you are using a certain function, and you find the prompt
ImportError: no module named'XXX', it may be that you are using a firmware that does not include this function. For example, the
minimum firmware does not include IDE and
image.find_blobs Function, if this firmware is burned, it will be unable to connect for a long time if you connect to the
IDE again. Using the function
image.find_blobs will also prompt that the function definition cannot be found.