UVM RAL

I need to know the details of UVM RAL register

1.I am reading the default value of the register.And in log file/waveform I see the value which is not matched with RAL values.
Since I didnt get any mismatch error.
Reading the register value as below,
rgs.mirror(status, UVM_CHECK)

2.How default value of mirror value is updated.Whether can we see the mirror value in verdi/dve