16-bit flash WR/Erase problems

Honored Contributor

20 years ago

Hi thosburke,

> Has anyone tried sharing a common databus and getting the flash to write/erase?

Yes. One of my boards does this -- it works.

> except trying to write to flash or erase a sector. If we do either of these things,

> linux hangs forcing a power cycle to reset things.

Just a guess ... but I've experienced similar problems -- it's related to the use

of the toggle-bit:

You might want to check the chip driver you're using and make sure it uses

some technique _other_than_ the toggle bit (e.g. DQ7 polling). The last time

I looked at this, CFI command set 2 was ok -- but I never checked the

other chip drivers.

> The flash device is the AM29LV128 in word mode, i.e. 16-bit interface

BTW: The flash organization on my board was only 8-bits wide ... and it worked,

so I never needed to make sure the NIOS2 mods in the code were clean for

16-bit devices: drivers/mtd/chips/cfi_cmdset_0002.c

Regards,

--Scott

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