non-os application in nand, 2nd level bootloader etc

Does anybody has an example of non-os nand-power-on working code?
stupid question, I am getting bored.

From supervivi menu
Select [a] - absolute user application.
It loads application into RAM first then it writes to nand.
when we power switch off-on, application is not working.
The code is working from RAM. In supervivi [d]- Download & Run 
The applicatin is less than 4k.
What is wrong? 

In Keil examples:

The 2-nd level Bootloader for 'S3C2440'

This is a 2-nd level bootloader for 'Samsung S3C2440' 
microcontroller with NAND Flash and External SDRAM. 
It downloads to BANK 0 of NAND Flash.
1-st level bootloader that is in ROM of S3C2440  
first downloads this 2-nd level bootloader to 
internal RAM and starts it.

2-nd level bootloader's main function is to copy the 
user program from NAND Flash to External SDRAM and 
start it.

Clock Settings:
  - XTAL             =  12 MHz
  - FCLK = MPLL      = 300 MHz
  - UCLK = UPLL / 2  =  48 MHz
  - HCLK = FCLK / 3  = 100 MHz
  - PCLK = HCLK / 2  =  50 MHz

Just select 'Flash -> Download', to download it 
to NAND Flash.

Note: Bad block skipping is supported
      Error correction (ECC) is not used.

NAND Flash Organization (64MB NAND Flash):

0x00000000 _ ____________________________
            |                            |
            |   2-nd Level Bootloader    |
            |                            |
0x00001000 -| - - - - - - - - - - - - - -|
            |                            |
            :  Reserved for future use   :
            :                            :
            |                            |
0x00004000 -|============================|
            |                            |
            |       User Program         |
            :                            :
            :                            :
0x04000000 _|____________________________|