When access Beaglebone gpio 1 while occur exception in u-boot , why?

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1

hi all
    I'm a am335x beginner,i want access gpio in u-boot but when i
access gpio 1 while occur exception.
my u-boot :
       http://arago-project.org/git/projects/?p=u-boot-am33x.git;a=shortlog;h=refs/heads/AM335XPSP_04.06.00.03
my command :
      #md 0x4804C000 <= access address 0x4804C000 in u-boot but
occur exception

Is anyone can tell me some hint??

thx !!!!

2

hi all
    I'm a am335x beginner,i want access gpio in u-boot but when i
access gpio 1 while occur exception.
my u-boot :
       http://arago-project.org/git/projects/?p=u-boot-am33x.git;a=shortlog;h=refs/heads/AM335XPSP_04.06.00.03
my command :
      #md 0x4804C000 <= access address 0x4804C000 in u-boot but
occur exception

Is anyone can tell me some hint??

Basically this means, clock (interface clock) is not enabled for the gpio module.

Thanks,
Vaibhav