Read the last sector from CFI Flash

Hello,

I'm trying to read the last sector from the Flash S29AL032D90BFI04 (see attachement) in x8 address range.

I used this command, but I got not the last sector.

nios2-flash-programmer  --base=0x3F0000  --read=current.srec  
--read-bytes=0,0xFFFF

The next try was to read out the whole memory:

nios2-flash-programmer  --base=0x0  --read=current.srec  
--read-bytes=0,0x3FFFFF

The File was almost 10 Mbyte??

How can I get the last sector of the flash?

Thanks a lot!