HAL

Nios II Hardware Abstraction Layer (HAL) is a well defined software layer that forms a clear distinction between application and device-level software. The HAL also provides services such as file descriptors, I/O control, and buffering, which are required by the ANSI C library functions, so that your HAL driver does not need to provide these functions.

Articles:

Loading Code Sections: How to create custom sections and load them.

IRQ Code: How the IRQ code works for the Nios II processor

Literature from Altera:

Nios II Hardware Abstraction Layer

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