error: Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(179,2)

[GoogleCodeExporter]

Hi,

In devkit8k board, I partition the sdcard with boot_fs(MLO, u-boot.bin & 
uImage) and android_fs. when I am trying to boot, it is showing the error as 
below.The environmental variables also setup as:

setenv bootargs console=ttyS2,115200n8 noinitrd root=/dev/mmcblk0p2 rw 
init=/init rootdelay=5 vram=12M omapdss.def_disp=lcd omapfb:mode:480x272 
omapdss.debug=y mem=128M
saveenv

mmc init
fatload mmc 0 80300000 uImage
bootm 80300000

But getting error as:

lib80211: common routines for IEEE802.11 drivers                                
Power Management for TI OMAP3.                                                  
VFP support v0.3: implementor 41 architecture 3 part 30 variant c rev 1         
Console: switching to colour frame buffer device 60x34                          
regulator_init_complete: incomplete constraints, leaving VDAC on                
twl4030_rtc twl4030_rtc: setting system clock to 2000-01-01 00:00:00 UTC (94668)
Waiting 5sec before mounting root device...                                     
mmc0: new SD card at address aaaa                                               
mmcblk0: mmc0:aaaa SD02G 1.84 GiB                                               
 mmcblk0:                                                                       
mmcblk0: error -84 transferring data, sector 0, nr 8, card status 0x900         
end_request: I/O error, dev mmcblk0, sector 0                                   
mmcblk0: error -84 transferring data, sector 1, nr 7, card status 0x900         
end_request: I/O error, dev mmcblk0, sector 1                                   
Buffer I/O error on device mmcblk0, logical block 0                             
mmcblk0: error -84 transferring data, sector 0, nr 8, card status 0x900         
end_request: I/O error, dev mmcblk0, sector 0                                   
Spurious DMA IRQ                                                                
Buffer I/O error on device mmcblk0, logical block 0                             
 unable to read partition table                                                 
VFS: Cannot open root device "mmcblk0p2" or unknown-block(179,2)                
Please append a correct "root=" boot option; here are the available partitions: 
1f00             512 mtdblock0 (driver?)                                        
1f01            1920 mtdblock1 (driver?)                                        
1f02             128 mtdblock2 (driver?)                                        
1f03            4096 mtdblock3 (driver?)                                        
1f04          255488 mtdblock4 (driver?)                                        
b300         1931264 mmcblk0 driver: mmcblk                                     
Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(179,2)

************************************************************

for sometime, it's working properly and booting.Can anyone help me where is the 
error and what needs to be done.

Original issue reported on code.google.com by bmks...@gmail.com on 8 Nov 2011 at 9:03