Forum Discussion

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

uncontrolled SDRAM content change

Hi, I use a code which checks external SDRAM () by writing 0xAAAA and 0x5555 patterns. But the code always return an error code! When I check step by step SDRAM content with NIOSII IDE I can ...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
14 years ago

Don't just add 0x8000_0000 to a pointer to bypass the cache, use the cache remapping macros since there are flushes involved as well. They are documented in the software developer's handbook. You might not see a behavior change since the flush is only necessary for some corner cases but you should get into a habit of using the APIs and not flipping bit 31 of your pointer locations.