8.4. Debugging BOOM
In addition to the default debugging techniques specified in Debugging RTL, single-core BOOM designs can utilize the Dromajo co-simulator (see Dromajo) to verify functionality.
Warning
Dromajo currently only works in single-core BOOM systems without accelerators.
Warning
Dromajo currently only works in VCS simulation and FireSim.
8.4.1. Setting up Dromajo Co-simulation
Dromajo co-simulation is setup to work when three config fragments are added to a BOOM config.
A
chipyard.config.WithTraceIO
config fragment must be added so that BOOM’s traceport is enabled.A
chipyard.iobinders.WithTraceIOPunchthrough
config fragment must be added to add theTraceIO
to theChipTop
A
chipyard.harness.WithSimDromajoBridge
config fragment must be added to instantiate a Dromajo cosimulator in theTestHarness
and connect it to theChipTop
’sTraceIO
Once all config fragments are added Dromajo should be enabled.
To build/run Dromajo with a BOOM design, run your configuration the following make commands:
# build the default Dromajo BOOM config without waveform dumps
# replace "DromajoBoomConfig" with your particular config
make CONFIG=DromajoBoomConfig ENABLE_DROMAJO=1
# run a simulation with Dromajo
make CONFIG=DromajoBoomConfig ENABLE_DROMAJO=1 BINARY=<YOUR-BIN> run-binary