[WIP]Update Minerva/sky130_c4m

* Reduce area
* Update blif file; used code
    #!/bin/env python3
    conv_text = (
      ("o2_x2", "or2_x1", None, None),
      ("o3_x2", "or3_x1", None, None),
      ("o4_x2", "or4_x1", None, None),
      ("a2_x2", "and2_x1", None, None),
      ("a3_x2", "and3_x1", None, None),
      ("a4_x2", "and4_x1", None, None),
      ("mx2_x2", "mux2_x1", None, None),
      ("nxr2_x1", "nexor2_x0", None, None), # Needs to be before next one
      ("xr2_x1", "xor2_x0", None, None),
      ("sff1_x4", "dff_x1", "ck=", "clk="),
      ("sff1r_x4", "dffnr_x1", "ck=", "clk="),
      ("ao22_x2", "and21nor_x1", "q=", "nq="),
      ("oa22_x2", "or21nand_x1", "q=", "nq="),
    )
    with open("non_generated/user_project_core_lambdasoc.blif", "r") as fin:
        with open("user_project_core_lambdasoc.blif", "w") as fout:
            for line in fin:
                for s, r, s2, r2 in conv_text:
                    if s in line:
                        line = line.replace(s, r)
                        if s2 is not None:
                            line = line.replace(s2, r2)
                fout.write(line)

TODO: PnR still fails.

benchs/RISC-V/Minerva/sky130_c4m/doDesign.py

@@ -66,7 +66,7 @@ def scriptMain ( **kw ):
         conf.bColumns            = 2
         conf.bRows               = 2
         conf.chipName            = 'chip'
-        conf.coreSize            = ( u(210*10.0), u(210*10.0) )
+        conf.coreSize            = ( u(210*6.0), u(210*6.0) )
        #conf.chipSize            = ( u(  2020.0), u(  2060.0) )
         conf.coreToChipClass     = CoreToChip
         conf.useHTree( 'io_in_from_pad(0)', Spares.HEAVY_LEAF_LOAD )