a2o/dev/readme.md

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# Testing RTL with new environments
##
* RTL
* updated source to remove a bunch of Verilator warnings
* updated source for compatibility with Icaraus -g2012
* changed the GPR/FPR macro to remove need for clk4x on FPGA; was ugly and not working with either simulator
* Verilator
* can IFETCH some ops in ST and SMT2 mode
* can't get cocotb to build with Verilator (very long compile times)
* Icarus (w/cocotb)
* executing boot code until test call with python A2L2 interface
* Yosys
* finishes compile
## Next To Do
* create A2L2 cpp model that can be used by Verilator and cocotb (Cython wrapper)
* eventually; don't need right now if can skip to RTL for A2L2
* create simple A2L2-WB RTL for easily connecting to Litex, etc.
* version 1 is pre-WB; uses RAM interface which could be sim driver or BRAM
* create Litex core wrapper
* 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)