Change filename personalize.py to patch_uds_udi.py

Also adding a more detailed explaination of what the script intends to
do

hw/application_fpga/tools/personalize.py

@@ -1,63 +0,0 @@
-# -*- coding: utf-8 -*-
-#=======================================================================
-#
-# personalize.py
-# --------------
-# Python program that patches the UDS and UDI implemented using
-# named LUT4 instances to have unique initial values, not the generic
-# values used during synthesis, p&r and mapping. This allows us to
-# generate device unique bitstreams without running the complete flow.
-#
-#
-# Copyright (C) 2023 Tillitis AB
-# Written by Myrtle Shah <gatecat@ds0.me>
-# SPDX-License-Identifier: GPL-2.0-only
-#
-#=======================================================================
-
-import os
-
-def parse_hex(file, length):
-    data = []
-    with open(file, "r") as f:
-        for line in f:
-            l = line.strip()
-            if len(l) > 0:
-                data.append(int(l, 16))
-    assert len(data) == length, len(data)
-    return data
-
-def rewrite_lut(lut, idx, data, has_re=False):
-    # each LUT provides one bit per 32-bit word out of 64/256 bits total
-    new_init = 0
-    for i, word in enumerate(data):
-        if (word >> idx) & 0x1:
-            # repeat so inputs above address have a don't care value
-            repeat = (16 // len(data))
-            for k in range(repeat):
-                # UDS also has a read enable
-                # LUT output is zero if this isn't asserted
-                if has_re and k < (repeat // 2):
-                    continue
-                new_init |= (1 << (k * len(data) + i))
-    lut.setParam("LUT_INIT", f"{new_init:016b}")
-
-uds = parse_hex(os.environ["UDS_HEX"], 8)
-udi = parse_hex(os.environ["UDI_HEX"], 2)
-
-uds_lut_count = 0
-udi_lut_count = 0
-
-for cell_name, cell in ctx.cells:
-    if "uds_rom_idx" in cell.attrs:
-        index = int(cell.attrs["uds_rom_idx"], 2)
-        rewrite_lut(cell, index, uds, True)
-        uds_lut_count += 1
-    if "udi_rom_idx" in cell.attrs:
-        index = int(cell.attrs["udi_rom_idx"], 2)
-        rewrite_lut(cell, index, udi, False)
-        udi_lut_count += 1
-assert uds_lut_count == 32, uds_lut_count
-assert udi_lut_count == 32, udi_lut_count
-
-write_bitstream(ctx, os.environ["OUT_ASC"])