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basic flow chart about beaglebone bare metal test



hi , I am a really new chip learner, I want to run bare metal  test about beaglebone , I follow this link :http://wiki.osdev.org/ARM_Beagleboard and http://stackoverflow.com/questions/9142951/hello-world-bare-metal-beagleboard
None of them works in beaglebone, I cannot get any output after I type command "go 0x8200_0000" in U-boot stage. Can anybody tell me how to do a bare metal test in beaglebone.

I also want to know how to set the cache (enable and disable) , can anyone post some code about seting cache, the method  and  how to check the status of the cache(CCS or some other code or software). 

Regards

Wei