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2 Commits (d112a7ad94dfd05861401fb66f5592137ba10c08)

Author SHA1 Message Date
Anton Blanchard 8acd5a5607 verilator: Specify top level module 
While verilator finds the correct top level module with the current
setup, if we start adding simulation models it can get confused.

Explicitly specify the top level module.

Signed-off-by: Anton Blanchard <anton@linux.ibm.com>
Anton Blanchard 3e8a6a8fc2 Add yosys/verilator support 
Add a microwatt-verilator target that simulates the
ghdl -> yosys -> verilog -> verilator path. A good test of
ghdl/yosys synthesis.

Because the everything is run through synthesis, the instruction
image is baked into the build via the RAM_INIT_FILE generic.

Signed-off-by: Anton Blanchard <anton@linux.ibm.com>