How to deal with reserved field in RAL model?

UVM
,
1

I’m trying to implement a reserved field in a RAL model.

This is my register .

class ID_t extends uvm_reg; 
     
  rand uvm_reg_field field2;                                                                                       
  rand uvm_reg_field rsvd;
  rand uvm_reg_field field1;
     
  virtual function void build();                                                                                   
    field2 = uvm_reg_field::type_id::create("field2");                                                             
    field2.configure(this, 16, 0, "RW", 0, 0, 1, 1, 1);                                   

    rsvd = uvm_reg_field::type_id::create("rsvd");                                                                 
    rsvd.configure(this, 8, 16, "RW", 0, 0, 0, 1, 1);                                                              

    field1 = uvm_reg_field::type_id::create("field1");                                                             
    field1.configure(this, 8, 24, "RW", 0, 0, 0, 1, 1);                                                            
  endfunction

There is a register(ID) which consists of 3 individual field(field1, rsvd, field2).
Firstly, I write the whole register with 32’h12345678, and overwrite it with individual field access as the below,

 mmap0.rfile0.ID.write(status, 32'h12345678); 
  mmap0.rfile0.ID.field1.write(status, 14'hab);

  mmap0.rfile0.ID.read(status, rdata);
  `uvm_info(get_type_name(), $sformatf("Read data :%h",rdata), UVM_LOW)

when I executed the RAL model, I get the mirror value mismatched error message as the below,

Register "ID" value read from DUT (0x0000000012bb5678) does not match mirrored value (0x0000000012345678)

How do I correctly set the reserved field in register model?