[otbn, dv] Writes to the CMD register to start an operation when locked
This commit adds a write to the cmd register whenever the otbn is
locked. The write is added in run_otbn task of otbn_base_vseq.
Signed-off-by: Prajwala Puttappa <prajwalaputtappa@lowrisc.org>
diff --git a/hw/ip/otbn/dv/uvm/env/seq_lib/otbn_base_vseq.sv b/hw/ip/otbn/dv/uvm/env/seq_lib/otbn_base_vseq.sv
index 79d4f89..f013592 100644
--- a/hw/ip/otbn/dv/uvm/env/seq_lib/otbn_base_vseq.sv
+++ b/hw/ip/otbn/dv/uvm/env/seq_lib/otbn_base_vseq.sv
@@ -274,6 +274,22 @@
cfg.m_alert_agent_cfg["recov"].vif.wait_ack_complete();
running_ = 1'b0;
+
+ if (cfg.model_agent_cfg.vif.status == otbn_pkg::StatusLocked) begin
+ logic [7:0] wdata;
+ bit cmd_wr = $urandom_range(9,0) == 0;
+ if (cmd_wr) begin
+ `uvm_info(`gfn, "entered locked status. Writing to cmd register", UVM_LOW)
+ `DV_CHECK_STD_RANDOMIZE_WITH_FATAL(wdata, wdata dist {otbn_pkg::CmdExecute :/2,
+ otbn_pkg::CmdSecWipeDmem :/ 2,
+ otbn_pkg::CmdSecWipeImem :/ 2,
+ 'b0 :/ 1};);
+ if (wdata == 'b0) begin
+ `DV_CHECK_STD_RANDOMIZE_FATAL(wdata);
+ end
+ csr_utils_pkg::csr_wr(ral.cmd, wdata);
+ end
+ end
endtask
// The guts of the run_otbn task. Writes to the CMD register to start OTBN and polls the status
