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Altera_Forum
Honored Contributor
Honored ContributorProblems with EPCS flash
We are designing a product which will use the EPCS flash for non-volatile storage. I'm having trouble accessing that flash on the Cyclone I development board. It is the 4M part on that board. I have seen it work (same hardware, same software) but now it doesn't, at least I don’t think I changed anything but you know how these things go. I have had the memtest tutorial working on this board so I do not suspect the hardware. I can see through the debugger that alt_flash_dev_list does not get populated so of course alt_flash_open_dev comes back with a NULL. Does anyone know how alt_flash_dev_list gets populated and/or have any thoughts about where to look? Thanks.
Mike2 Replies
Altera_ForumHmmmm,
I've been reading some others posts like this one: http://www.niosforum.com/forum/index.php?a...f=17&t=1900&hl= (http://www.niosforum.com/forum/index.php?act=st&f=17&t=1900&hl=) It seems related to the topic but not quite the same. I know that our desire is to use the serial flash as a configuration device AND for the Nios code to be stored there AND to use it as general non-volatile storage. Is this possible? I would think that would be okay as the code is not running out of the flash, it is just downloaded from it to SDRAM on power-up. Mike- Altera_Forum
Hi Mike,
> I'm having trouble accessing that flash on the Cyclone I development board. If you want to test the hardware, you can grab a pre-built u-boot and try the the 'epcs' command. If you are booting from the epcs controller, there was an old issue that caused some problems ... not sure if it was ever fixed since I have a work-around permanently added to all of my code. Anyway, the following may be relevant: http://www.niosforum.com/forum/index.php?a...chip,and,select (http://www.niosforum.com/forum/index.php?act=st&f=2&t=1071&hl=epcs,and,chip,and,select) http://www.niosforum.com/forum/index.php?a...ct=st&f=2&t=850 (http://www.niosforum.com/forum/index.php?act=st&f=2&t=850) Regards, --Scott
