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Altera_Forum
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13 years ago

boot NIOS from EPCS flash and use SDRAM to store instructions and data

Hi! In the qsys I have: 1. Clock Source 2. On-Chip Memory 3. Nios II Processor 4. System ID 5. JTAG UART 6. EPCS Serial Flash Controller 7. PIO 8. SDRAM Controller I want to use...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
13 years ago

Boot code is just code that copies data from the boot device (in this case the EPCS device) and main memory.

An ELF program (as output by ld) has 'program headers' (run objdump -p) that make it very simple to load.

To get C code running on the nios you need asm instructions to set %sp and %gp and then jump to the C function (don't call it main()).

I've never had to access EPCS type memory - but it can't be hard!