User Manual Q&AAnswer
Feb 28, 2025 - 10:31 PM
To boot your Nios II system using different boot memories, you can follow the general flow and options provided in the Intel 1.5.1 Nios II Booting General Flow User Guide.
1. Determine the boot memory: The boot memory can be Compact Flash Interface (CFI) flash, User Flash Memory (UFM) flash, Altera Serial Flash (EPCS)/Altera Quad Serial Flash (EPCQ) configuration device, or on-chip RAM (OCRAM).
2. Configure the run time locations: Specify the run time locations for program and data memory by manipulating the Nios II BSP settings. This can be done by enabling or disabling certain settings in the BSP Settings.
3. Choose the boot copier: Depending on the boot memory, you can choose between a memcpy-based boot copier or an EPCS controller-based boot copier.
4. Configure the linker script: Set the linker script in the BSP Editor to specify the memory regions for different linker sections (.text, .rodata, .rwdata, .exceptions, etc.).
5. Enable alt_load() function: If you want to copy the application from the boot memory to RAM using a boot copier, enable the alt_load() function in the BSP settings. This function copies the data sections (.rodata, .rwdata, .exceptions) to RAM.
6. Generate memory initialization files: Use the Nios II SBT Makefile "mem_init_generate" target to generate memory initialization files, such as HEX files or SREC images, based on the boot options and programming solutions.
7. Program the flash memory: Use the Nios II Flash Programmer or Quartus Prime Programmer to program the flash memory with the generated memory initialization files.
By following these steps and referring to the detailed information provided in the user guide, you can successfully boot your Nios II system using different boot memories.
Note: It is recommended to refer to the specific sections and chapters mentioned in the user guide for more detailed instructions and explanations on each step.
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