Set_inst_override for same component with different parameter values in UVM. Isn't possible ? or Is there any issue in the code?

UVM
,
1

Hello All,

  1. I have a parameterized driver, with a type and struct as parameters. Say as given below.


typedef struct {
  int hello;
} drv_struct_s;

parameter drv_struct_s drv_struct_default = '{hello=2};

class v_driver #(
 parameter type ABC = logic,
 parameter drv_struct_s vd = drv_struct_default
) extends uvm_driver #(drv_seq_itm);  

// Note: In the agent I just instance the driver as,  v_driver v_drv - i.e. allowing it to pick the default parameters values.
  1. In the base test, I try to override this driver as follows,

parameter drv_struct_s drv_struct_d0 = '{hello=5};
parameter drv_struct_s drv_struct_d1 = '{hello=8};

v_driver#(logic, drv_struct_default)::type_id::set_inst_override(v_driver#(integer, drv_struct_d0)::get_type(), "dummy_env.v_agt[0].v_drv", this); 
v_driver#(logic, drv_struct_default)::type_id::set_inst_override(v_driver#(int, drv_struct_d1)::get_type(), "dummy_env.v_agt[1].v_drv", this);

While trying the above override, I am ending up with below error

UVM_FATAL @ 0: reporter [FCTTYP] Factory did not return a component of type ‘unknown’. A component of type ‘uvm_driver #(REQ,RSP)’ was returned instead. Name=v_drv Parent=v_agent contxt=uvm_test_top.dummy_env.v_agt[0]

Is there any issue in overriding the same component but with different parameter values ? Please do share in your views.

2

In reply to desperadorocks:

Hello !

I tried the option provided by @Dave from the below link, it doesn’t give any overriding error, but I don’t see the values being overridden.
Overriding Parameters

All I tried was…

  1. Created a common_v_driver as given below.

class common_v_driver extends uvm_driver #(drv_seq_item)
  1. Created the parameterized driver as shown below

typedef struct {
  int hello;
} drv_struct_s;
 
parameter drv_struct_s drv_struct_default = '{hello=2};
 
class v_driver #(
 parameter type ABC = logic,
 parameter drv_struct_s vd = drv_struct_default
) extends common_v_driver;  
...
`uvm_component_param_utils_begin(v_driver#(ABC, vd))
...
endclass: v_driver
  1. In the base test tried the following,

parameter drv_struct_s drv_struct_d0 = '{hello=5};
parameter drv_struct_s drv_struct_d1 = '{hello=8};
 
uvm_object_wrapper v_driver_proxy[int] = '{
                 0:v_driver#(integer, drv_struct_d0)::get_type(),
                 1:v_driver#(int, drv_struct_d1)::get_type()
             };


set_inst_override_by_type("dummy_env.v_agt[0].v_drv", common_v_driver::get_type(), v_driver_proxy[0]);

Am I missing any of the glue logic here ? Share in your thoughts/ideas ! THanks in adv !

3

In reply to desperadorocks:

You also need to change the agent so it constructs the common_v_driver.

4

In reply to dave_59:

Thanks a TON Dave for the hint. Got it working.

Note:

  1. Inside the v_agt, I had instanced the v_driver instead of the common_v_driver.
  2. Once I changed the driver instance inside the v_agt to common_v_driver, I was able to override the parameters from the test with different types of parameterized driver configs.

Appreciate your help !