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a2o/dev/sim/verilator
History
openpowerwtf 53f5449f97 update for verilator debug 2 years ago
..
readme.md update for verilator debug 2 years ago
tb.cpp verilator debug 2 years ago
tb_litex.cpp changes for verilator debug 2 years ago
tb_node.cpp update 2 years ago
verilator-v224-82-debug.txt update for verilator debug 2 years ago
verilator.txt update for verilator debug 2 years ago
verilog verilator debug 2 years ago

readme.md

Verilator

core-only initial experiment

verilator -cc --exe --trace --Mdir obj_dir --language 1364-2001 -Wno-fatal -Wno-LITENDIAN --error-limit 1 -Iverilog/work -Iverilog/trilib_clk1x -Iverilog/trilib -Iverilog/unisims c.v tb.cpp

make -C obj_dir -f Vc.mk Vc
obj_dir/Vc

core + node (extmem version)

verilator -cc --exe --trace --Mdir obj_dir --language 1364-2001 -Wno-fatal -Wno-LITENDIAN --error-limit 1  -Iverilog/work -Iverilog/trilib_clk1x -Iverilog/trilib -Iverilog/unisims -Iverilog/a2node a2owb.v tb_node.cpp

make -C obj_dir -f Va2owb.mk Va2owb
obj_dir/Va2owb
  • doesn't work (test3/mem.init), which does work for coccotb/icarus
  • tid compare at start looks like it's using wrong value (imm from following bc?) and erat code is skipped

core + node wb (litex)

  • verilog/a2onode_litex
verilator -cc --exe --trace --Mdir obj_dir --language 1364-2001 -Wno-fatal -Wno-LITENDIAN --error-limit 1  -Iverilog/a2o_litex -Iverilog/work -Iverilog/trilib_clk1x -Iverilog/trilib -Iverilog/unisims a2owb.v tb_litex.cpp

make -C obj_dir -f Va2owb.mk Va2owb
obj_dir/Va2owb
  • debugged several fails near start of test (in issues) - first few are cases of ff behaving incorrectly; syntax changes in trilib got to reaching i=1 ifetches
  • added CP signals to track completions (/verilator public/) and now first isync fails (flushes to @04)

Verilator Debug

  • install multiple versions concurrently
git pull
git checkout master
#..or...
#git checkout stable
#git checkout vxxx

unset VERILATOR_ROOT
export VERILATOR_VERSION=`git describe | sed "s/verilator_//"`
./configure --prefix /tools/verilator/$VERILATOR_VERSION
make -j <n>
make install
cp -r include /tools/verilator/$VERILATOR_VERSION   # had to do this too

# symlink
ln -sf /tools/verilator/$VERILATOR_VERSION /tools/verilator/latest
  • pick and run...
export VERILATOR_ROOT=/tools/verilator/latest

# rm -r obj_dir   # to be safe?
verilator -cc --exe --trace --Mdir obj_dir --language 1364-2001 -Wno-fatal -Wno-LITENDIAN --error-limit 1  -Iverilog/a2o_litex -Iverilog/work -Iverilog/trilib_clk1x -Iverilog/trilib -Iverilog/unisims a2owb.v tb_litex.cpp

make -C obj_dir -f Va2owb.mk Va2owb
obj_dir/Va2owb

Try different versions with same RTL

  • rtl and tb_litex.cpp
git log | head -1
commit 7cbbf9f3844a9287c5fac88867bcbcd5739914cf

  • export VERILATOR_ROOT=/tools/verilator/v4.106

  • #define OLD_PUBLIC in tb_litex.cpp

  • the ifetch is bad, but so are the completes a little before it; @42C=eratwe r8,r0,0 ... 00000250 Completed: I0:1 000000000000042C 00000262 WB RD RA=00000460 00000263 WB RD ACK RA=00000460 DATA=7D4011A6 00000264 WB RD RA=00000464 00000265 WB RD ACK RA=00000464 DATA=7C8009A6 00000266 WB RD RA=00000468 00000267 WB RD ACK RA=00000468 DATA=7D0001A6 00000268 WB RD RA=0000046C 00000269 WB RD ACK RA=0000046C DATA=4C00012C 00000272 Completed: I0:1 0000000000000000 I1:1 0000000000000000 00000286 WB RD RA=00000000 *** Fetch to boot address (00000000) after initial boot! ***


* export VERILATOR_ROOT=/tools/verilator/v4.204

00000250 Completed: I0:1 000000000000042C 00000262 WB RD RA=00000460 00000263 WB RD ACK RA=00000460 DATA=7D4011A6 00000264 WB RD RA=00000464 00000265 WB RD ACK RA=00000464 DATA=7C8009A6 00000266 WB RD RA=00000468 00000267 WB RD ACK RA=00000468 DATA=7D0001A6 00000268 WB RD RA=0000046C 00000269 WB RD ACK RA=0000046C DATA=4C00012C 00000272 Completed: I0:1 0000000000000000 I1:1 0000000000000000 00000286 WB RD RA=00000000 *** Fetch to boot address (00000000) after initial boot! *** ...

  • export VERILATOR_ROOT=/tools/verilator/stable (v4.224-26-g8b7480806)
00000250 Completed: I0:1 000000000000042C
00000262 WB RD RA=00000460
00000263 WB RD ACK RA=00000460 DATA=7D4011A6
00000264 WB RD RA=00000464
00000265 WB RD ACK RA=00000464 DATA=7C8009A6
00000266 WB RD RA=00000468
00000267 WB RD ACK RA=00000468 DATA=7D0001A6
00000268 WB RD RA=0000046C
00000269 WB RD ACK RA=0000046C DATA=4C00012C
00000272 Completed: I0:1 0000000000000000 I1:1 0000000000000000
00000286 WB RD RA=00000000
*** Fetch to boot address (00000000) after initial boot! ***
  • export VERILATOR_ROOT=/tools/verilator/latest (v4.224-82-gcbe1b8e26)
%Error: Verilator internal fault, sorry. Suggest trying --debug --gdbbt
%Error: Command Failed /tools/verilator/latest/bin/verilator_bin -cc --exe --trace --Mdir obj_dir --language 1364-2001 -Wno-fatal -Wno-LITENDIAN --error-limit 1 -Iverilog/a2o_litex -Iverilog/work -I

verilator -cc --debug --gddbt--exe --trace --Mdir obj_dir --language 1364-2001 -Wno-fatal -Wno-LITENDIAN --error-limit 1  -Iverilog/a2o_litex -Iverilog/work -Iverilog/trilib_clk1x -Iverilog/trilib -Iverilog/unisims a2owb.v tb_litex.cpp  |& tee verilator-v224-82-debug.txt