diff --git a/ql-qlf-plugin/Makefile b/ql-qlf-plugin/Makefile
index e6f7a63..e2fa3e1 100644
--- a/ql-qlf-plugin/Makefile
+++ b/ql-qlf-plugin/Makefile
@@ -10,7 +10,8 @@
 SOURCES = synth_quicklogic.cc \
           ql-dsp.cc \
           pp3_braminit.cc \
-          quicklogic_eqn.cc
+          quicklogic_eqn.cc \
+          ql-edif.cc
 
 include ../Makefile_plugin.common
 
diff --git a/ql-qlf-plugin/ql-edif.cc b/ql-qlf-plugin/ql-edif.cc
new file mode 100644
index 0000000..902e065
--- /dev/null
+++ b/ql-qlf-plugin/ql-edif.cc
@@ -0,0 +1,630 @@
+/*
+ *  yosys -- Yosys Open SYnthesis Suite
+ *
+ *  Copyright (C) 2012  Claire Xenia Wolf <claire@yosyshq.com>
+ *  Copyright (C) 2021  The SymbiFlow Authors
+ *
+ *  Permission to use, copy, modify, and/or distribute this software for any
+ *  purpose with or without fee is hereby granted, provided that the above
+ *  copyright notice and this permission notice appear in all copies.
+ *
+ *  THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ *  WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ *  MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ *  ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ *  WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ *  ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ *  OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ *
+ */
+
+// [[CITE]] EDIF Version 2 0 0 Grammar
+// http://web.archive.org/web/20050730021644/http://www.edif.org/documentation/BNF_GRAMMAR/index.html
+
+#include "kernel/celltypes.h"
+#include "kernel/log.h"
+#include "kernel/register.h"
+#include "kernel/rtlil.h"
+#include "kernel/sigtools.h"
+#include <string>
+
+USING_YOSYS_NAMESPACE
+PRIVATE_NAMESPACE_BEGIN
+
+#define EDIF_DEF(_id) edif_names(RTLIL::unescape_id(_id), true).c_str()
+#define EDIF_DEFR(_id, _ren, _bl, _br) edif_names(RTLIL::unescape_id(_id), true, _ren, _bl, _br).c_str()
+#define EDIF_REF(_id) edif_names(RTLIL::unescape_id(_id), false).c_str()
+
+struct EdifNames {
+    int counter;
+    char delim_left, delim_right;
+    std::set<std::string> generated_names, used_names;
+    std::map<std::string, std::string> name_map;
+
+    EdifNames() : counter(1), delim_left('['), delim_right(']') {}
+
+    std::string operator()(std::string id, bool define, bool port_rename = false, int range_left = 0, int range_right = 0)
+    {
+        if (define) {
+            std::string new_id = operator()(id, false);
+            if (port_rename)
+                return stringf("(rename %s \"%s%c%d:%d%c\")", new_id.c_str(), id.c_str(), delim_left, range_left, range_right, delim_right);
+            return new_id != id ? stringf("(rename %s \"%s\")", new_id.c_str(), id.c_str()) : id;
+        }
+
+        if (name_map.count(id) > 0)
+            return name_map.at(id);
+        if (generated_names.count(id) > 0)
+            goto do_rename;
+        if (id == "GND" || id == "VCC")
+            goto do_rename;
+
+        for (size_t i = 0; i < id.size(); i++) {
+            if ('A' <= id[i] && id[i] <= 'Z')
+                continue;
+            if ('a' <= id[i] && id[i] <= 'z')
+                continue;
+            if ('0' <= id[i] && id[i] <= '9' && i > 0)
+                continue;
+            if (id[i] == '_' && i > 0 && i != id.size() - 1)
+                continue;
+            goto do_rename;
+        }
+
+        used_names.insert(id);
+        return id;
+
+    do_rename:;
+        std::string gen_name;
+        while (1) {
+            gen_name = stringf("id%05d", counter++);
+            if (generated_names.count(gen_name) == 0 && used_names.count(gen_name) == 0)
+                break;
+        }
+        generated_names.insert(gen_name);
+        name_map[id] = gen_name;
+        return gen_name;
+    }
+};
+
+struct QLEdifBackend : public Backend {
+    QLEdifBackend() : Backend("ql_edif", "write design to EDIF netlist file") {}
+    void help() override
+    {
+        //   |---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|
+        log("\n");
+        log("    write_ql_edif [options] [filename]\n");
+        log("\n");
+        log("Write the current design to an EDIF netlist file.\n");
+        log("\n");
+        log("    -top top_module\n");
+        log("        set the specified module as design top module\n");
+        log("\n");
+        log("    -nogndvcc\n");
+        log("        do not create \"GND\" and \"VCC\" cells. (this will produce an error\n");
+        log("        if the design contains constant nets. use \"hilomap\" to map to custom\n");
+        log("        constant drivers first)\n");
+        log("\n");
+        log("    -gndvccy\n");
+        log("        create \"GND\" and \"VCC\" cells with \"Y\" outputs. (the default is \"G\"\n");
+        log("        for \"GND\" and \"P\" for \"VCC\".)\n");
+        log("\n");
+        log("    -attrprop\n");
+        log("        create EDIF properties for cell attributes\n");
+        log("\n");
+        log("    -keep\n");
+        log("        create extra KEEP nets by allowing a cell to drive multiple nets.\n");
+        log("\n");
+        log("    -pvector {par|bra|ang}\n");
+        log("        sets the delimiting character for module port rename clauses to\n");
+        log("        parentheses, square brackets, or angle brackets.\n");
+        log("\n");
+        log("Unfortunately there are different \"flavors\" of the EDIF file format. This\n");
+        log("command generates EDIF files for the Xilinx place&route tools. It might be\n");
+        log("necessary to make small modifications to this command when a different tool\n");
+        log("is targeted.\n");
+        log("\n");
+    }
+    void execute(std::ostream *&f, std::string filename, std::vector<std::string> args, RTLIL::Design *design) override
+    {
+        log_header(design, "Executing QL EDIF backend.\n");
+        std::string top_module_name;
+        bool port_rename = false;
+        bool attr_properties = false;
+        std::map<RTLIL::IdString, std::map<RTLIL::IdString, int>> lib_cell_ports;
+        bool nogndvcc = false, gndvccy = false, keepmode = false;
+        CellTypes ct(design);
+        EdifNames edif_names;
+
+        size_t argidx;
+        for (argidx = 1; argidx < args.size(); argidx++) {
+            if (args[argidx] == "-top" && argidx + 1 < args.size()) {
+                top_module_name = args[++argidx];
+                continue;
+            }
+            if (args[argidx] == "-nogndvcc") {
+                nogndvcc = true;
+                continue;
+            }
+            if (args[argidx] == "-gndvccy") {
+                gndvccy = true;
+                continue;
+            }
+            if (args[argidx] == "-attrprop") {
+                attr_properties = true;
+                continue;
+            }
+            if (args[argidx] == "-keep") {
+                keepmode = true;
+                continue;
+            }
+            if (args[argidx] == "-pvector" && argidx + 1 < args.size()) {
+                std::string parray;
+                port_rename = true;
+                parray = args[++argidx];
+                if (parray == "par") {
+                    edif_names.delim_left = '(';
+                    edif_names.delim_right = ')';
+                } else if (parray == "ang") {
+                    edif_names.delim_left = '<';
+                    edif_names.delim_right = '>';
+                } else {
+                    edif_names.delim_left = '[';
+                    edif_names.delim_right = ']';
+                }
+                continue;
+            }
+            break;
+        }
+        extra_args(f, filename, args, argidx);
+
+        if (top_module_name.empty())
+            for (auto module : design->modules())
+                if (module->get_bool_attribute(ID::top))
+                    top_module_name = module->name.str();
+
+        for (auto module : design->modules()) {
+            if (module->get_blackbox_attribute())
+                continue;
+
+            if (top_module_name.empty())
+                top_module_name = module->name.str();
+
+            if (module->processes.size() != 0)
+                log_error("Found unmapped processes in module %s: unmapped processes are not supported in EDIF backend!\n", log_id(module->name));
+            if (module->memories.size() != 0)
+                log_error("Found unmapped memories in module %s: unmapped memories are not supported in EDIF backend!\n", log_id(module->name));
+
+            for (auto cell : module->cells()) {
+                if (design->module(cell->type) == nullptr || design->module(cell->type)->get_blackbox_attribute()) {
+                    lib_cell_ports[cell->type];
+                    for (auto p : cell->connections())
+                        lib_cell_ports[cell->type][p.first] = GetSize(p.second);
+                }
+            }
+        }
+
+        if (top_module_name.empty())
+            log_error("No module found in design!\n");
+
+        *f << stringf("(edif %s\n", EDIF_DEF(top_module_name));
+        *f << stringf("  (edifVersion 2 0 0)\n");
+        *f << stringf("  (edifLevel 0)\n");
+        *f << stringf("  (keywordMap (keywordLevel 0))\n");
+        *f << stringf("  (comment \"Generated by %s\")\n", yosys_version_str);
+
+        *f << stringf("  (external LIB\n");
+        *f << stringf("    (edifLevel 0)\n");
+        *f << stringf("    (technology (numberDefinition))\n");
+
+        if (!nogndvcc) {
+            *f << stringf("    (cell GND\n");
+            *f << stringf("      (cellType GENERIC)\n");
+            *f << stringf("      (view VIEW_NETLIST\n");
+            *f << stringf("        (viewType NETLIST)\n");
+            *f << stringf("        (interface (port %c (direction OUTPUT)))\n", gndvccy ? 'Y' : 'G');
+            *f << stringf("      )\n");
+            *f << stringf("    )\n");
+
+            *f << stringf("    (cell VCC\n");
+            *f << stringf("      (cellType GENERIC)\n");
+            *f << stringf("      (view VIEW_NETLIST\n");
+            *f << stringf("        (viewType NETLIST)\n");
+            *f << stringf("        (interface (port %c (direction OUTPUT)))\n", gndvccy ? 'Y' : 'P');
+            *f << stringf("      )\n");
+            *f << stringf("    )\n");
+        }
+
+        for (auto &cell_it : lib_cell_ports) {
+            *f << stringf("    (cell %s\n", EDIF_DEF(cell_it.first));
+            *f << stringf("      (cellType GENERIC)\n");
+            *f << stringf("      (view VIEW_NETLIST\n");
+            *f << stringf("        (viewType NETLIST)\n");
+            *f << stringf("        (interface\n");
+            for (auto &port_it : cell_it.second) {
+                const char *dir = "INOUT";
+                if (ct.cell_known(cell_it.first)) {
+                    if (!ct.cell_output(cell_it.first, port_it.first))
+                        dir = "INPUT";
+                    else if (!ct.cell_input(cell_it.first, port_it.first))
+                        dir = "OUTPUT";
+                }
+                int width = port_it.second;
+                int start = 0;
+                bool upto = false;
+                auto m = design->module(cell_it.first);
+                if (m) {
+                    auto w = m->wire(port_it.first);
+                    if (w) {
+                        width = GetSize(w);
+                        start = w->start_offset;
+                        upto = w->upto;
+                    }
+                }
+                if (width == 1)
+                    *f << stringf("          (port %s (direction %s))\n", EDIF_DEF(port_it.first), dir);
+                else {
+                    for (int b = start; b < start + width; b++) {
+                        *f << stringf("          (port (rename %s_%d_ \"%s(%d)\") (direction %s))\n", EDIF_DEF(port_it.first), b,
+                                      EDIF_DEF(port_it.first), b, dir);
+                    }
+                }
+            }
+            *f << stringf("        )\n");
+            *f << stringf("      )\n");
+            *f << stringf("    )\n");
+        }
+        *f << stringf("  )\n");
+
+        std::vector<RTLIL::Module *> sorted_modules;
+
+        // extract module dependencies
+        std::map<RTLIL::Module *, std::set<RTLIL::Module *>> module_deps;
+        for (auto module : design->modules()) {
+            module_deps[module] = std::set<RTLIL::Module *>();
+            for (auto cell : module->cells())
+                if (design->module(cell->type) != nullptr)
+                    module_deps[module].insert(design->module(cell->type));
+        }
+
+        // simple good-enough topological sort
+        // (O(n*m) on n elements and depth m)
+        while (module_deps.size() > 0) {
+            size_t sorted_modules_idx = sorted_modules.size();
+            for (auto &it : module_deps) {
+                for (auto &dep : it.second)
+                    if (module_deps.count(dep) > 0)
+                        goto not_ready_yet;
+                // log("Next in topological sort: %s\n", log_id(it.first->name));
+                sorted_modules.push_back(it.first);
+            not_ready_yet:;
+            }
+            if (sorted_modules_idx == sorted_modules.size())
+                log_error("Cyclic dependency between modules found! Cycle includes module %s.\n", log_id(module_deps.begin()->first->name));
+            while (sorted_modules_idx < sorted_modules.size())
+                module_deps.erase(sorted_modules.at(sorted_modules_idx++));
+        }
+
+        *f << stringf("  (library DESIGN\n");
+        *f << stringf("    (edifLevel 0)\n");
+        *f << stringf("    (technology (numberDefinition))\n");
+
+        auto add_prop = [&](IdString name, Const val) {
+            if ((val.flags & RTLIL::CONST_FLAG_STRING) != 0)
+                *f << stringf("\n            (property %s (string \"%s\"))", EDIF_DEF(name), val.decode_string().c_str());
+            else if (val.bits.size() <= 32 && RTLIL::SigSpec(val).is_fully_def()) {
+                *f << stringf("\n            (property %s (integer %u))", EDIF_DEF(name), val.as_int());
+            } else {
+                std::string hex_string = "";
+                for (size_t i = 0; i < val.bits.size(); i += 4) {
+                    int digit_value = 0;
+                    if (i + 0 < val.bits.size() && val.bits.at(i + 0) == RTLIL::State::S1)
+                        digit_value |= 1;
+                    if (i + 1 < val.bits.size() && val.bits.at(i + 1) == RTLIL::State::S1)
+                        digit_value |= 2;
+                    if (i + 2 < val.bits.size() && val.bits.at(i + 2) == RTLIL::State::S1)
+                        digit_value |= 4;
+                    if (i + 3 < val.bits.size() && val.bits.at(i + 3) == RTLIL::State::S1)
+                        digit_value |= 8;
+                    char digit_str[2] = {"0123456789abcdef"[digit_value], 0};
+                    hex_string = std::string(digit_str) + hex_string;
+                }
+                *f << stringf("\n            (property %s (string \"%d'h%s\"))", EDIF_DEF(name), GetSize(val.bits), hex_string.c_str());
+            }
+        };
+        auto add_lut_prop = [&](IdString name, Const val) {
+            if ((val.flags & RTLIL::CONST_FLAG_STRING) != 0)
+                *f << stringf("\n            (property %s (string \"%s\"))", EDIF_DEF(name), val.decode_string().c_str());
+            else if (val.bits.size() <= 32 && RTLIL::SigSpec(val).is_fully_def()) {
+                if (strstr(name.c_str(), "INIT"))
+                    *f << stringf("\n            (property %s (string \"%X\"))", EDIF_DEF(name), val.as_int());
+                else
+                    *f << stringf("\n            (property %s (integer %u))", EDIF_DEF(name), val.as_int());
+            } else {
+                std::string hex_string = "";
+                for (size_t i = 0; i < val.bits.size(); i += 4) {
+                    int digit_value = 0;
+                    if (i + 0 < val.bits.size() && val.bits.at(i + 0) == RTLIL::State::S1)
+                        digit_value |= 1;
+                    if (i + 1 < val.bits.size() && val.bits.at(i + 1) == RTLIL::State::S1)
+                        digit_value |= 2;
+                    if (i + 2 < val.bits.size() && val.bits.at(i + 2) == RTLIL::State::S1)
+                        digit_value |= 4;
+                    if (i + 3 < val.bits.size() && val.bits.at(i + 3) == RTLIL::State::S1)
+                        digit_value |= 8;
+                    char digit_str[2] = {"0123456789abcdef"[digit_value], 0};
+                    hex_string = std::string(digit_str) + hex_string;
+                }
+                *f << stringf("\n            (property %s (string \"%d'h%s\"))", EDIF_DEF(name), GetSize(val.bits), hex_string.c_str());
+            }
+        };
+        for (auto module : sorted_modules) {
+            if (module->get_blackbox_attribute())
+                continue;
+
+            SigMap sigmap(module);
+            std::map<RTLIL::SigSpec, std::set<std::pair<std::string, bool>>> net_join_db;
+
+            *f << stringf("    (cell %s\n", EDIF_DEF(module->name));
+            *f << stringf("      (cellType GENERIC)\n");
+            *f << stringf("      (view VIEW_NETLIST\n");
+            *f << stringf("        (viewType NETLIST)\n");
+            *f << stringf("        (interface\n");
+
+            for (auto cell : module->cells()) {
+                for (auto &conn : cell->connections())
+                    if (cell->output(conn.first))
+                        sigmap.add(conn.second);
+            }
+
+            for (auto wire : module->wires())
+                for (auto b1 : SigSpec(wire)) {
+                    auto b2 = sigmap(b1);
+
+                    if (b1 == b2 || !b2.wire)
+                        continue;
+
+                    log_assert(b1.wire != nullptr);
+
+                    Wire *w1 = b1.wire;
+                    Wire *w2 = b2.wire;
+
+                    {
+                        int c1 = w1->get_bool_attribute(ID::keep);
+                        int c2 = w2->get_bool_attribute(ID::keep);
+
+                        if (c1 > c2)
+                            goto promote;
+                        if (c1 < c2)
+                            goto nopromote;
+                    }
+
+                    {
+                        int c1 = w1->name.isPublic();
+                        int c2 = w2->name.isPublic();
+
+                        if (c1 > c2)
+                            goto promote;
+                        if (c1 < c2)
+                            goto nopromote;
+                    }
+
+                    {
+                        auto count_nontrivial_attr = [](Wire *w) {
+                            int count = w->attributes.size();
+                            count -= w->attributes.count(ID::src);
+                            count -= w->attributes.count(ID::unused_bits);
+                            return count;
+                        };
+
+                        int c1 = count_nontrivial_attr(w1);
+                        int c2 = count_nontrivial_attr(w2);
+
+                        if (c1 > c2)
+                            goto promote;
+                        if (c1 < c2)
+                            goto nopromote;
+                    }
+
+                    {
+                        int c1 = w1->port_id ? INT_MAX - w1->port_id : 0;
+                        int c2 = w2->port_id ? INT_MAX - w2->port_id : 0;
+
+                        if (c1 > c2)
+                            goto promote;
+                        if (c1 < c2)
+                            goto nopromote;
+                    }
+
+                nopromote:
+                    if (0)
+                    promote:
+                        sigmap.add(b1);
+                }
+
+            for (auto wire : module->wires()) {
+                if (wire->port_id == 0)
+                    continue;
+                const char *dir = "INOUT";
+                if (!wire->port_output)
+                    dir = "INPUT";
+                else if (!wire->port_input)
+                    dir = "OUTPUT";
+                if (wire->width == 1) {
+                    *f << stringf("          (port %s (direction %s)", EDIF_DEF(wire->name), dir);
+                    if (attr_properties)
+                        for (auto &p : wire->attributes)
+                            add_prop(p.first, p.second);
+                    *f << ")\n";
+                    RTLIL::SigSpec sig = sigmap(RTLIL::SigSpec(wire));
+                    net_join_db[sig].insert(make_pair(stringf("(portRef %s)", EDIF_REF(wire->name)), wire->port_input));
+                } else {
+                    int b[2];
+                    b[wire->upto ? 0 : 1] = wire->start_offset;
+                    b[wire->upto ? 1 : 0] = wire->start_offset + GetSize(wire) - 1;
+                    *f << stringf("          (port (array %s %d) (direction %s)", EDIF_DEFR(wire->name, port_rename, b[0], b[1]), wire->width, dir);
+                    if (attr_properties)
+                        for (auto &p : wire->attributes)
+                            add_prop(p.first, p.second);
+
+                    *f << ")\n";
+                    for (int i = 0; i < wire->width; i++) {
+                        RTLIL::SigSpec sig = sigmap(RTLIL::SigSpec(wire, i));
+                        net_join_db[sig].insert(
+                          make_pair(stringf("(portRef %s_%d_)", EDIF_REF(wire->name), GetSize(wire) - i - 1), wire->port_input));
+                    }
+                }
+            }
+
+            *f << stringf("        )\n");
+            *f << stringf("        (contents\n");
+
+            if (!nogndvcc) {
+                *f << stringf("          (instance GND (viewRef VIEW_NETLIST (cellRef GND (libraryRef LIB))))\n");
+                *f << stringf("          (instance VCC (viewRef VIEW_NETLIST (cellRef VCC (libraryRef LIB))))\n");
+            }
+
+            for (auto cell : module->cells()) {
+                *f << stringf("          (instance %s\n", EDIF_DEF(cell->name));
+                *f << stringf("            (viewRef VIEW_NETLIST (cellRef %s%s))", EDIF_REF(cell->type),
+                              lib_cell_ports.count(cell->type) > 0 ? " (libraryRef LIB)" : "");
+                if (strstr(cell->type.c_str(), "LUT")) {
+                    for (auto &p : cell->parameters)
+                        add_lut_prop(p.first, p.second);
+                    if (attr_properties)
+                        for (auto &p : cell->attributes)
+                            add_lut_prop(p.first, p.second);
+                } else {
+                    for (auto &p : cell->parameters)
+                        add_prop(p.first, p.second);
+                    if (attr_properties)
+                        for (auto &p : cell->attributes)
+                            add_prop(p.first, p.second);
+                }
+
+                *f << stringf(")\n");
+                for (auto &p : cell->connections()) {
+                    RTLIL::SigSpec sig = sigmap(p.second);
+                    for (int i = 0; i < GetSize(sig); i++)
+                        if (sig[i].wire == NULL && sig[i] != RTLIL::State::S0 && sig[i] != RTLIL::State::S1)
+                            log_warning("Bit %d of cell port %s.%s.%s driven by %s will be left unconnected in EDIF output.\n", i, log_id(module),
+                                        log_id(cell), log_id(p.first), log_signal(sig[i]));
+                        else {
+                            int member_idx = GetSize(sig) - i - 1;
+                            auto m = design->module(cell->type);
+                            int width = sig.size();
+                            if (m) {
+                                auto w = m->wire(p.first);
+                                if (w) {
+                                    member_idx = GetSize(w) - i - 1;
+                                    width = GetSize(w);
+                                }
+                            }
+                            if (width == 1)
+                                net_join_db[sig[i]].insert(make_pair(
+                                  stringf("(portRef %s (instanceRef %s))", EDIF_REF(p.first), EDIF_REF(cell->name)), cell->output(p.first)));
+                            else {
+                                net_join_db[sig[i]].insert(make_pair(stringf("(portRef %s_%d_ (instanceRef %s))", EDIF_REF(p.first),
+                                                                             width - member_idx - 1, EDIF_REF(cell->name)), // reverse IDs
+                                                                     cell->output(p.first)));
+                            }
+                        }
+                }
+            }
+
+            for (auto &it : net_join_db) {
+                RTLIL::SigBit sig = it.first;
+                if (sig.wire == NULL && sig != RTLIL::State::S0 && sig != RTLIL::State::S1) {
+                    if (sig == RTLIL::State::Sx) {
+                        for (auto &ref : it.second)
+                            log_warning("Exporting x-bit on %s as zero bit.\n", ref.first.c_str());
+                        sig = RTLIL::State::S0;
+                    } else if (sig == RTLIL::State::Sz) {
+                        continue;
+                    } else {
+                        for (auto &ref : it.second)
+                            log_error("Don't know how to handle %s on %s.\n", log_signal(sig), ref.first.c_str());
+                        log_abort();
+                    }
+                }
+                std::string netname;
+                if (sig == RTLIL::State::S0)
+                    netname = "GND_NET";
+                else if (sig == RTLIL::State::S1)
+                    netname = "VCC_NET";
+                else {
+                    netname = log_signal(sig);
+                    for (size_t i = 0; i < netname.size(); i++)
+                        if (netname[i] == ' ' || netname[i] == '\\')
+                            netname.erase(netname.begin() + i--);
+                }
+                *f << stringf("          (net %s (joined\n", EDIF_DEF(netname));
+                for (auto &ref : it.second)
+                    *f << stringf("              %s\n", ref.first.c_str());
+                if (sig.wire == NULL) {
+                    if (nogndvcc)
+                        log_error("Design contains constant nodes (map with \"hilomap\" first).\n");
+                    if (sig == RTLIL::State::S0)
+                        *f << stringf("            (portRef %c (instanceRef GND))\n", gndvccy ? 'Y' : 'G');
+                    if (sig == RTLIL::State::S1)
+                        *f << stringf("            (portRef %c (instanceRef VCC))\n", gndvccy ? 'Y' : 'P');
+                }
+                *f << stringf("            )");
+                if (attr_properties && sig.wire != NULL)
+                    for (auto &p : sig.wire->attributes)
+                        add_prop(p.first, p.second);
+                *f << stringf("\n          )\n");
+            }
+
+            for (auto wire : module->wires()) {
+                if (!wire->get_bool_attribute(ID::keep))
+                    continue;
+
+                for (int i = 0; i < wire->width; i++) {
+                    SigBit raw_sig = RTLIL::SigSpec(wire, i);
+                    SigBit mapped_sig = sigmap(raw_sig);
+
+                    if (raw_sig == mapped_sig || net_join_db.count(mapped_sig) == 0)
+                        continue;
+
+                    std::string netname = log_signal(raw_sig);
+                    for (size_t i = 0; i < netname.size(); i++)
+                        if (netname[i] == ' ' || netname[i] == '\\')
+                            netname.erase(netname.begin() + i--);
+
+                    if (keepmode) {
+                        *f << stringf("          (net %s (joined\n", EDIF_DEF(netname));
+
+                        auto &refs = net_join_db.at(mapped_sig);
+                        for (auto &ref : refs)
+                            if (ref.second)
+                                *f << stringf("              %s\n", ref.first.c_str());
+                        *f << stringf("            )");
+
+                        if (attr_properties && raw_sig.wire != NULL)
+                            for (auto &p : raw_sig.wire->attributes)
+                                add_prop(p.first, p.second);
+
+                        *f << stringf("\n          )\n");
+                    } else {
+                        log_warning("Ignoring conflicting 'keep' property on net %s. Use -keep to generate the extra net nevertheless.\n",
+                                    EDIF_DEF(netname));
+                    }
+                }
+            }
+
+            *f << stringf("        )\n");
+            *f << stringf("      )\n");
+            *f << stringf("    )\n");
+        }
+        *f << stringf("  )\n");
+
+        *f << stringf("  (design %s\n", EDIF_DEF(top_module_name));
+        *f << stringf("    (cellRef %s (libraryRef DESIGN))\n", EDIF_REF(top_module_name));
+        *f << stringf("  )\n");
+
+        *f << stringf(")\n");
+    }
+} QLEdifBackend;
+
+PRIVATE_NAMESPACE_END
diff --git a/ql-qlf-plugin/synth_quicklogic.cc b/ql-qlf-plugin/synth_quicklogic.cc
index 95d2161..36c3afe 100644
--- a/ql-qlf-plugin/synth_quicklogic.cc
+++ b/ql-qlf-plugin/synth_quicklogic.cc
@@ -379,7 +379,7 @@
             run("splitnets -ports -format ()");
             run("quicklogic_eqn");
 
-            run(stringf("write_edif -nogndvcc -attrprop -pvector par %s %s", this->currmodule.c_str(), edif_file.c_str()));
+            run(stringf("write_ql_edif -nogndvcc -attrprop -pvector par %s %s", this->currmodule.c_str(), edif_file.c_str()));
         }
 
         if (check_label("verilog")) {