Windows server 2008 x86 - sql 2008 R2 standard - Memory question

Windows server 2008 x86 

sql 2008 R2 standard

Max mem - 60 gb, have set 4GB for OS. AWE enabled, SQL is slowly trying to consume the available memory. But sys.dm_os_ sys_info shows bpool_visible still as 1.5 gb, whereas I see bpool_committed slowly raising to 2.5gb and bpool_commit_target something like 55GB. BOL states that bppo_visible is same as bpool_commit_target, but why I am seeing 1.5 gb instead of 55GB as in bpool_commit_target ?

Thanks.

Ranga