Forum Discussion

Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
20 years ago

Got a question for the bootloader/flash gurus

If I run elf2flash with the --boot option I can make a .flash file out of a .elf file identical to the ext_flash.flash file the Nios IDE makes for me. Both files have 8 bytes I can't account for ...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
20 years ago

Hi bkucera,

> What do 0x00012970 and 0x0000eff0 represent?

You are, of course, correct. The boot loader expects a sequence of

length-address-data records -- one for each linker output section that is loaded.

The final record normally has a length of zero, which indicates that the following

address is the "jump" target.

You read through the bootloader code and comments from boot_loader.S in:

$SOPC_KIT_NIOS2/components/altera_nios2/sdk/src/bootloader_sources/

Regards,

--Scott