An interrupt is a signal to the processor emitted by hardware or software indicating an event that needs immediate attention. An interrupt alerts the processor to a high-priority condition requiring the interruption of the current code being executed by the processor. When a hardware interrupt is triggered, the interrupt handler is located based on the interrupt ID and then executed to handle the interrupt.
Set up the basic environment by following instructions in [Ubuntu Build Environment](../quick-start/quickstart-lite-env-setup-linux.md). Both the user space and LiteOS Cortex-A kernel space are compiled using the LLVM compiler. If you choose to port the Linux kernel, run the following command to install the gcc-arm-linux-gnueabi cross compiler for compiling the Linux kernel-space image:
Set up the basic environment by following instructions in [Ubuntu Build Environment](../quick-start/quickstart-lite-steps-hi3861-setting.md). Both the user space and LiteOS Cortex-A kernel space are compiled using the LLVM compiler. If you choose to port the Linux kernel, run the following command to install the gcc-arm-linux-gnueabi cross compiler for compiling the Linux kernel-space image:
