nios II -sometime booting sometime not

[Altera_Forum]

Dear Friends, 

 I have nios II system (STRATIX II EP2S60F1020C5)with,   1. SDRAM 2. ext Flash 3. Nios II 4. LED  Reset : CFI flash Exepction: SDRAM  Software library setup, .ro, program. , .txt - everything point to - SDRAM  This system setup is works fine, when trigger with nios II IDE, and when board reset and cpu reset,   but real problem comes when i done with bootloader, the system sometimes boots out of 10 try 6 try success, another 4 try fails, and cpu reset sometimes success then fails,  i dont know what is the problem , please help me   regards baba

[Altera_Forum]

Check if the max frequency of your system after synthesis/fitter is more important than the running frequency of your system on the board (usually 85mhz).

[Altera_Forum]

Are you using JTAG UART? Try using a simple program with boot loader that simply blinks LEDs and does not use JTAG UART.