write-only register read() via backdoor failure

[Robert.g.Liu]

One of register test requirements is that the write-only register written with a new value in advance can be read back correctly via the back-door interface anyway. It is to prove the correctness of write to the write-only register via front-door.

The uvm_reg doesn't support this because it will do the pre_read check using uvm_reg_write_only_cbs class before the true backdoor operation is done. The read is then returned with UVM_NOT_OK and failed eventually.

Suppose the test requirement makes sense here, what could I work-around this? Seem the uvm_reg should be updated to distinguish the backdoor and frontdoor way of read from write-only register.

[petermonsson]

I recommend that you use peek() for checking the write operation. If you are using a built in register sequence which fails, then let me know. I will file a bug report.