booting mSD

[Test]

I downloaded these files below link to my mSD and tried to boot from mSD. it locked up with message "Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-bloc". not sure why?
 
http://downloads.openmoko.org/distro/testing/NeoFreerunner/
 
[21474539.975000] Waiting 5sec before mounting root device...
[21474542.490000] pcf50633 0-0073: usb curlim to 1000 mA
[21474544.985000] VFS: Cannot open root device "mmcblk0p2" or unknown-block(0,0)
[21474544.990000] Please append a correct "root=" boot option; here are the available part                           
        itions:
[21474544.995000] 1f00            2048 mtdblock0 (driver?)
[21474545.005000] 1f01             256 mtdblock1 (driver?)
[21474545.010000] 1f02             256 mtdblock2 (driver?)
[21474545.015000] 1f03            8192 mtdblock3 (driver?)
[21474545.020000] 1f04             640 mtdblock4 (driver?)
[21474545.030000] 1f05             256 mtdblock5 (driver?)
[21474545.040000] 1f06          252544 mtdblock6 (driver?)
[21474545.050000] b300          498176 mmcblk0 driver: mmcblk
[21474545.055000]   b301          498058 mmcblk0p1
[21474545.060000] Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-bloc                           
        k(0,0)


      
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