There is no way to access the BMC from Solaris using the servers Sun Fire T1000 and T2000. Sun is planning a scadm command to use with these CMT servers but until they release it you’ll need to run SUNWexplorer with a special parameter.
root@sunt2000 # /opt/SUNWexplo/bin/explorer -w Tx000
After the SUNWexplorer completes the gathering of your server configuration, go to /opt/SUNWexplo/output/<explorer filename>/Tx000 and check for the file you’re looking for more information. It has several information about your System Controller.
If you’re looking for a way to reset the ALOM password without powering down the server, it won’t be possible. You can follow these steps to recover TX000 ALOM Passwords