Initial changes for adding debug_sba feature to regression

regression/Makefile

@@ -231,6 +231,8 @@ ifdef SEED
 SEED_ARG = --seed $(SEED)
 endif
 
+JTAG_DTM_ENABLE_SBA ?= off
+
 JTAG_DTM_SIM_ARGS = +verbose +jtag_rbb_enable=1 $(SEED_ARG)
 
 stamps/riscv-tests.stamp:

scripts/RocketSim.cfg

@@ -14,6 +14,8 @@ target create $_TARGETNAME riscv -chain-position $_TARGETNAME -rtos riscv
 riscv set_reset_timeout_sec 120
 riscv set_command_timeout_sec 120
 
+riscv set_prefer_sba $::env(JTAG_DTM_ENABLE_SBA)
+
 init
 halt
 echo "Ready for Remote Connections"