hi,

I'm using the AT91SAM7X512 and tried to write the internal flash.
I encountered some big problems while doing this.

In my code i configured the wait states register of the EFC in 2 places (to the same value).
When i did this flash writing did not worked. when i marked one of the configurations, it worked.
So this is the first little voodoo i got.
Also, i'm using 2 cards for development - the AT91SAM7X-EK and in house card. in the EK the problem was fixed with this solution, but in the other card the EFC behaved very strangly:
Sometimes the flash write didn't work at all.
Sometimes it burned in a page offset.
Sometimes it had no offset but the first page was written badly.
(I must say this bahaviors also accured in the EK sometimes, before fixing the problem).

I tried many values for the EFC register (both wait states field and the number of cycles in uSec). also tried many variations of configuring this register in different places/different times (at startup/before writing the flash/...). nothing changed.

Does anybody experienced this before?

thanks,
Dan

hello again,

I found a workaround for my problem, which raise some questions about the EFC reliability.
if i disable the auto-erase feature, and erase each page by myself before burning it, everything works fine.

so now my questions are:
1. Does anybody encountered this problem (with auto-erase)?
2. If i write the EFC page buffer BEFORE erasing the page, can i be sure the data in the page buffer will remain correct? (i need this in order to change just one word in the page - thus copying the flash page to the page buffer before erasing it).

Dan