a2o/dev

Testing RTL with new environments

• RTL

  • updated source to remove a bunch of Verilator warnings
  • updated source for compatibility with Icaraus -g2012
  • changed arrays to use clk1x
  • refactored nclk[] to separate clk, rst signals and removed lcb's from clock path

• Verilator

  • too big(?) to build with verilator --public with cocotb
  • executing boot code and tst with a2o_litex wrapper

• Icarus (w/cocotb)

  • executing boot code and tst with core/node/a2o_litex

• Yosys

  • finishes compile

Next To Do

• create Cython code for sharing between cocotb and verilator tb
• OpenLane experiments with blackbox arrays and yosys/abc/sta
• create FPGA version of GPR/FPR (4R4W) using (4)4R1W banks and valid table
• parse vcd/fst and serve browser code for custom trace screens (handle spec/arch mapped facilities, arrays, etc.)

node

• test BE/LE versions; kernel can stay BE until jump to BIOS; any problem with BIOS to initial ROM copy/zero or is it always words?
• eventually node should handle reset vector fetch; or make the reset vector tied to inputs so always configurable?
• add config pins
• add L2 internally (before WB)