target create $_TARGETNAME riscv -chain-position $_TARGETNAME -rtos riscv
gdb_report_data_abort enable
+gdb_report_register_access_error enable
+
+# Expose an unimplemented CSR so we can test non-existent register access
+# behavior.
+riscv expose_csrs 2288
init
-reset halt
+
+set challenge [ocd_riscv authdata_read]
+riscv authdata_write [expr $challenge + 1]
+
+halt