Quote Originally Posted by longpole001 View Post
be it 4k or 64k , a routine to change say 1- 256k bytes in the same sector/page on the fly is really nice routine to have on hand on these chips and would be easy enough to change to the size that best suites your needs
We need to start on the routine or have you started?

Your approach in #1 is to copy sectors to be changed to sector 0. The routine will read from the sector 0 into say byte variables these will then be changed if required and written to Flash. This will be repeated for the whole 4k.

Any thoughts?