It can invalidate ECC codes, and in general is not guaranteed
to work. (However on some chips it _appears_ to behave.) Just
don't do it; don't write in those cases.
Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>
+- Don't expect writing all-ones to be a safe way to write without
+ changing bit values. Minimally it loses on flash modules with
+ internal ECC, where it may change the ECC.
+ - NOR flash_write_unlock() does that between sectors
+ - there may be other cases too
+
@subsection thelistflashcfi CFI
- finish implementing bus width/chip width handling (suggested by NC)
@subsection thelistflashcfi CFI
- finish implementing bus width/chip width handling (suggested by NC)
- /* REVISIT This needlessly touches sectors BETWEEN the
+ /* FIXME This needlessly touches sectors BETWEEN the
* sections it's writing. Without auto erase, it just
* sections it's writing. Without auto erase, it just
- * writes ones; unlikely to destroy data.
+ * writes ones. That WILL INVALIDATE data in cases
+ * like Stellaris Tempest chips, corrupting internal
+ * ECC codes; and at least FreeScale suggests issues
+ * with that approach (in HC11 documentation).
*
* With auto erase enabled, data in those sectors will
* be needlessly destroyed; and some of the limited
*
* With auto erase enabled, data in those sectors will
* be needlessly destroyed; and some of the limited
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