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I have discovered that my program/stack/heap etc. are all stored on the ddr2. How do I know which addresses Nios use in the ddr2? Is it recommended to keep this on a different memory? Thanks for the help so far.
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Solution 1
In order to choose where your program sections (code/stack/etc.) are loaded into ddr2 you must use a custom linker script, but I've never used it with Nios IDE, so I can't tell you how to do it.
Solution 2
If you have another memory device, you can move there all program sections: open your system library project properties and you'll find where each section is mapped to, and possibly can move it.
Solution 3 (best)
Anyway, instead of using IOWR_32DIRECT I'd rather alloc a memory buffer and I'd use it to write data: the linker will automatically adjust addresses and will avoid it overlaps other memory sections.
Example:
char bigbuffer[BIG_BUFFER_SIZE];
while(bytes_to_process--) {
bigbuffer[sdram_addr++] = *(conn->rx_rd_pos));
conn->rx_rd_pos = conn->rx_rd_pos + 1;
/* this avoids memory corruption when your memory gets filled */
if (sdram_addr >= BIG_BUFFER_SIZE)
sdram_addr = 0;
}
Hope this will help you
Regards
Cris
Honored Contributor
