Hi,everyone!
I'm a newcomer.I've really puzzled over the question for a long time.I've tried to rebuilt my Uimage ,and reinstalled my ubuntu 10.04,but still,it stucks here:"uncompressing linux..."
I've set the board starting from NANDFLASH.my cpu is OMAPL138,and my board is SEED_DEC138,and here is my uboot environment:
U-Boot > printenv                                                               
bootdelay=3                                                                     
baudrate=115200                                                                 
bootfile="uImage"                                                               
ethaddr=0a:c1:a8:15:fa:c0                                                       
ethact=                                                                         
ip=10.108.51.101                                                                
filesize=F60000                                                                 
fileaddr=C1180000                                                               
serverip=192.168.253.77                                                         
ipaddr=192.168.253.123                                                          
bootargs=mem=128M console=ttyS0,115200n8 root=/dev/nfs                          
bootcmd=tftp 0xc0700000 uImage; bootm                                           
stdin=serial                                                                    
stdout=serial                                                                   
stderr=serial                                                                   
ver=U-Boot 2009.01 (Jan 06 2010 - 11:01:54)            
the upper red line is a little strange ,I guess it's from my last setting,but I guess it has nothing to do with the problem since the board can download uImage successfully through tftp.
problems occured after I reset the board:
Environment size: 356/131068 bytes                                              
U-Boot >                                                                        
                                                                                
U-Boot 2009.01 (Jan 06 2010 - 11:01:54)                                         
                                                                                
I2C:   ready                                                                    
DRAM:  64 MB                                                                    
NAND:  NAND device: Manufacturer ID: 0xec, Chip ID: 0xdc (Samsung NAND 512MiB 3)
Bad block table found at page 262080, version 0x01                              
Bad block table found at page 262016, version 0x01                              
nand_read_bbt: Bad block at 0x11860000                                          
nand_read_bbt: Bad block at 0x1b7a0000                                          
512 MiB                                                                         
In:    serial                                                                   
Out:   serial                                                                   
Err:   serial                                                                   
ARM Clock : 300000000 Hz                                                        
DDR Clock : 150000000 Hz                                                        
Net:   More than one PHY detected.                                              
                                                                                
Hit any key to stop autoboot:  0                                                
Using  device                                                                   
TFTP from server 192.168.253.77; our IP address is 192.168.253.123              
Filename 'uImage'.                                                              
Load address: 0xc0700000                                                        
Loading: #################################################################      
         #################################################################      
         #################################################################      
         #################################################################      
         #################################################################      
         #################################                                      
done                                                                            
Bytes transferred = 1832092 (1bf49c hex)                                        
## Booting kernel from Legacy Image at c0700000 ...                             
   Image Name:   Linux-2.6.32-rc6                                               
   Image Type:   ARM Linux Kernel Image (uncompressed)                          
   Data Size:    1832028 Bytes =  1.7 MB                                        
   Load Address: c0008000                                                       
   Entry Point:  c0008000                                                       
   Verifying Checksum ... OK                                                    
   Loading Kernel Image ... OK                                                  
OK                                                                              
                                                                                
Starting kernel ...                                                             
                                                                                
Uncompressing Linux.............................................................
 then it stucks here,nothing happens.
 
				 
		 
					 
                          