Solution 2

Use this alternate method when the system is already in OpenBoot:

1. At the monitor OpenBoot prompt, type:

   ---

   ok nvedit
   0: probe-all install-console banner
   1: apply disable-link-pulse device-name
   (Repeat this step for other device names as needed.) 
   (Press CONTROL-C to exit nvedit.)
   ok nvstore
   ok setenv use-nvramrc? true

   ---

2. Reboot to make the changes effective.