Nios® V Processor Software Developer Handbook

ID 743810
Date 2/14/2023
Public

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Document Table of Contents

6.12.2.1. System Initialization Code Boot Sequence

The HAL provides system initialization code in the C runtime library (crt0.S). This code performs the following boot sequence:
  • Flushes the instruction and data cache (if present).
  • Configures the stack pointer.
  • Configures the global pointer register.
  • Initializes the block started by symbol (BSS) region to zeroes using the linker-supplied symbols __bss_start and __bss_end. These are pointers to the beginning and the end of the BSS region.
  • If there is no boot loader present in the system, copies to RAM any linker section whose run address is in RAM, such as .rwdata, .rodata, and .exceptions.
  • Calls alt_main().