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Altera_Forum
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20 years ago

Nios II Flash Problems

We have a Nios II board design that has been populated with two types of CFI Flash chips. Toshiba and the ExcelSemi equivalent? 16Mbit CFI Flash devices. Checking the data sheets all pins are the sa...
Altera_Forum's avatar
Altera_Forum
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20 years ago

From your posts it's not clear whether all Toshiba's don't work or only some of them. In case they all don't work: have you tried stepping through the initialization of the CFI flash drivers? I have a small incompatibility with my chips although it still works. When I stepped through the source I noticed that the assumption of AMD or Intel chips is being made and even then not all AMD chips behave the way the driver expects. Try setting a break point in in alt_sys_init where it calls the flash driver init here:

ALTERA_AVALON_CFI_FLASH_INIT( FLASH, flash );

then step through that code and check whether the chip behaves as the source code expects.

Andrew