replacing AT90S8515

good morning,
I must change the AVR8515 in my application with the new MEGA8515, but i
have a big problem: after fuse bit setting (see below for the setting) the
aplication doesn't work.
Some data about the application:
AVR 8515, clock (quartz) = 8 MHz
no external RAM
Fuse Bits: SPIEN = 0 (programmed); FSTRT = 0 (programmed)
Lock Bits: MODE1 selected (no memory lock features enabled)

After reading the AVR085 Application note (replacing AT90S8515 by AT
mega8515) i select this fuse bits configuration:
S8515     = 0 (Prog.)
WDTON   = 1 (Unprog.) 
SPIEN      = 0 (P)
CKOPT    = 1 (U)
EESAVE  = 1 (U)
BOOTSZ1= 0 (U) ---->I tried also with 1 (P) but nothing change
BOOTSZ0 = 0 (U)----> i tried also with 1 (P) but nothing change
BOOTRST = 1 (U)
BODLEVEL= 1 (U)
BODEN    = 1 (U)
SUT1       = 1 (U)
SUT0       = 0 (P)
CKSEL3   = 1 (U) 
CKSEL2   = 1 (U) 
CKSEL1   = 1 (U) 
CKSEL0   = 1 (U) 

what I have to do to make the Atmega working like the AT90S8515 ?

Best regars

Alessaandro Serafini.

Alessandro Serafini 
MD Micro Detectors s.p.a. 
R&D Department
Strada S. Caterina, 235 
41100 Modena - Italy
Tel.: +39 059 420411
Fax: +39 059 420420
www.microdetectors.com <http://www.microdetectors.com>
[email protected]