The content of all the other pages are 0xff. And I can't erase the whole flash chip by -E option. And the last page keep the content I programmed into.
The contents are 0xff _before_ you ever tried to program the device? That means you cannot access those pages at all.
Typically, on x86 systems, you need to do some setup on your northbridge first.
Thanks for your help!
My pleasure.
Segher