Arria10 FPGA config_done is not coming up after programming.

Hi ,

Here is the details from the fit.rpt

; Total registers ; 141905 ;
; Total pins ; 365 / 812 ( 45 % ) ;
; Total virtual pins ; 0 ;
; Total block memory bits ; 26,496,000 / 36,864,000 ( 72 % ) ;
; Total RAM Blocks ; 1,800 / 1,800 ( 100 % ) ;
; Total DSP Blocks ; 3 / 1,523 ( < 1 % ) ;
; Total HSSI RX channels ; 12 / 48 ( 25 % ) ;
; Total HSSI TX channels ; 12 / 48 ( 25 % ) ;
; Total PLLs ; 24 / 96 ( 25 % )

I have probed all the lines of Flash, The outcome is,

FPGA is trying to drive chip select, It's going low then high then repeating the same. Because of the CS pin flickering the data pin is trying to send something data, whenever the CS pin is in a low position for a small period of time.

But while probing twice the FPGA booted. but don't know how it happens.

I was suspecting the power sequencer and another configuration pin. But both are fine concluded after doing some experiments on another working board.