How to implement my own bootloader

[Altera_Forum]

Hi, 

My system doesn't use CFI Flash but SPI Flash, so I have to creat my own bootloader to read code from SPI Flash to SDRAM.  Now, I have implemented a bootloader code which is located in an onchip memory and it can work fine to read data from SPI Flash to SDRAM.  But I have a important question: Before reading data from SPI Flash to SDRAM, I should initialize the SPI Flash with my Main Code, but how can I get Main Code???  As I know, NiosII IDE will create *.elf for you, but this file will contain many more redundant code which is for programming CFI Flash. What I need is only the following sections: .exceptions, .rodata, .rwdata and .text   Anyone help?   Thanks very much!

[Altera_Forum]

Hi David, 

 > As I know, NiosII IDE will create *.elf for you, but this file will contain many more > redundant code which is for programming CFI Flash. What I need is only the following > sections: > .exceptions, .rodata, .rwdata and .text  Use nios2-elf-objcopy.  Regards, --Scott

[Altera_Forum]

Hi Smcnutt: 

  I'm not familiar with TCL tools, in fact, I never use them.  Could you teach me how to use nios2-elf-objcopy and what will I get?  Or, if there is any document related to TCL tools, pls let me know!   Thanks very much!

[Altera_Forum]

> I'm not familiar with TCL tools, in fact, I never use them. 

 objcopy is part of binutils -- use it from a command shell prompt.  > Could you teach me how to use nios2-elf-objcopy and what will I get?  Try:  $ nios2-elf-objcopy --help  You can also review documents\gnu-tools\binutils\binutils.html in your nios2 installation directory.  Regards, --Scott

[Altera_Forum]

Dear Scott: 

  Thanks very much!  Everything is OK, now! http://forum.niosforum.com/work2/style_emoticons/<#EMO_DIR#>/tongue.gif   Best regards, David