Change flash memory form M25P to N25Q

M25P isn't supported by Vivado and also it isn't recommended by Micron for new designs.

Change it to e.g. N25Q256A

Also, will we change from two memories to a single memory.

I note that having two memories is not the worse problem - switching between them do work properly, and we have tested it at LNLS - but seems unnecessary and complicated.

The main problem is having two bus masters (FPGA and MMC). I don't know yet how to solve this elegantly.

I decided not to change the bus access. Some discipline on accessing the bus should be enough to prevent conflicts in operation, and in the worst case, the CPU can coordinate blocks.

assigned to @tprzywoz

changed milestone to %AFC v4.0

marked #94 (closed) as a duplicate of this issue

This issue seems to be solved by commit 08c8a36e.

In the first version, I changed flash memory form M25P to N25Q but I left 2 ICs. Should I change to single one?

Only if you feel the need to. It is not much used, but it seems not be an issue.

I'd go for a single one. It will make a circuit simpler and "OTA" can be done using FPGA restart from defined flash offset.

I'm a simplifying urge, so if no one feels the need to keep two, I'd change to a single one.

mentioned in issue #116 (closed)

mentioned in commit c2b15c2f

Solved in c2b15c2f

closed