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Altera_Forum's avatar
Altera_Forum
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14 years ago

Flash Access Problems

We have a 3 processor design that all boot successfully from a single CFI flash (all reset addresses are set to our CFI Flash at different addresses). The firmwares run in different On Board Memories...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
14 years ago

DSL,

I am under the impression that all accesses to the flash are handled by the arbitration mechanism with the SOPC builder system - if so why would I need "some inter-cpu locking to stop more than one cpu accessing the flash hardware at the same time" ??

Another question : Is it possible for the CFI table to be become corrupted ? I saw in the Flash Programmers guide from Altera the following :-

"Nios II Flash Programmer provides the ability to override CFI table entries with flash override files. A flash override file lets you manually override erroneous information in the CFI table, which enables the Nios II Flash Programmer to function correctly "

Can conclude from this that the CFI table could be corrupted ? If so how does this hapenn and how do I fix it ? Also is there anyway to protect the CFI table so that it can't hapenn again ?