replacing AT90S8515

WOW!!!!  :-)
the micro runs the AT90S8515 program!!!
this is very unexpected to me because I change the oscillator parameters
with a different configuration: 
CKOPT = 0 (Prog)
SUT = 01
CKSEL = 1101 
note that the SUT and CKSEL cnfiguration are suggested for a ceramic
resonator while I use cristal resonator.
now I'm wondering if this "strange" configuration is due to:
1. a documentation error (see 2512D ATMEGA8515 complete manual) 
or 
2. a bug in the AVR STK 500: the configuration setted is send to the
programmer in a different way.

But this is not all :-(
I can't program the device in In Serial Programming mode till now (I use a
customer board for this that worked always OK for the AT90S8515).
may be a different setting of the BOOT fuses bits???
My whole configuration now is:
S8515 = 	0
WDTON = 	1
SPIEN =   	0
CKOPT =   	0
EESAVE =  	1
BOOTSZ1 = 	0
BOOTSZ0 = 	0
BOOTRST = 	1
BODLEVEL = 	1
BODEN = 	1
SUT1 = 	0
SUT0 = 	1
CKSEL3 = 	1
CKSEL2 = 	1
CKSEL1 = 	0
CKSEL0 = 	1
 
Bye.

Alessandro Serafini