diff --git a/backends/aiger/xaiger.cc b/backends/aiger/xaiger.cc
index 7cb311736..0c2ae62e6 100644
--- a/backends/aiger/xaiger.cc
+++ b/backends/aiger/xaiger.cc
@@ -190,7 +190,7 @@ struct XAigerWriter
 
 		bool abc_box_seen = false;
 
-		for (auto cell : module->cells()) {
+		for (auto cell : module->selected_cells()) {
 			if (cell->type == "$_NOT_")
 			{
 				SigBit A = sigmap(cell->getPort("\\A").as_bit());
@@ -312,7 +312,7 @@ struct XAigerWriter
 			TopoSort<IdString, RTLIL::sort_by_id_str> toposort;
 			dict<SigBit, pool<IdString>> bit_drivers, bit_users;
 
-			for (auto cell : module->cells()) {
+			for (auto cell : module->selected_cells()) {
 				RTLIL::Module* inst_module = module->design->module(cell->type);
 				if (!inst_module || !inst_module->attributes.count("\\abc_box_id"))
 					continue;
@@ -722,7 +722,7 @@ struct XAigerWriter
 			write_h_buffer(box_list.size());
 
 			RTLIL::Module *holes_module = nullptr;
-			holes_module = module->design->addModule("\\__holes__");
+			holes_module = module->design->addModule("$__holes__");
 			log_assert(holes_module);
 
 			int port_id = 1;
@@ -822,17 +822,22 @@ struct XAigerWriter
 
 				Pass::call(holes_module->design, "flatten -wb");
 
-				// TODO: Should techmap all lib_whitebox-es once
+				// TODO: Should techmap/aigmap/check all lib_whitebox-es just once,
+				// instead of per write_xaiger call
 				Pass::call(holes_module->design, "techmap");
 				Pass::call(holes_module->design, "aigmap");
-				Pass::call(holes_module->design, "clean -purge");
+				for (auto cell : holes_module->cells())
+					if (!cell->type.in("$_NOT_", "$_AND_"))
+						log_error("Whitebox contents cannot be represented as AIG. Please verify whiteboxes are synthesisable.\n");
 
-				holes_module->design->selection_stack.pop_back();
+				Pass::call(holes_module->design, "clean -purge");
 
 				std::stringstream a_buffer;
 				XAigerWriter writer(holes_module, false /*zinit_mode*/, true /* holes_mode */);
 				writer.write_aiger(a_buffer, false /*ascii_mode*/);
 
+				holes_module->design->selection_stack.pop_back();
+
 				f << "a";
 				std::string buffer_str = a_buffer.str();
 				int32_t buffer_size_be = to_big_endian(buffer_str.size());
diff --git a/passes/techmap/abc9.cc b/passes/techmap/abc9.cc
index fe199f886..f7f2e862a 100644
--- a/passes/techmap/abc9.cc
+++ b/passes/techmap/abc9.cc
@@ -243,8 +243,8 @@ struct abc_output_filter
 
 void abc9_module(RTLIL::Design *design, RTLIL::Module *current_module, std::string script_file, std::string exe_file,
 		bool cleanup, vector<int> lut_costs, bool dff_mode, std::string clk_str,
-		bool keepff, std::string delay_target, std::string lutin_shared, bool fast_mode,
-		const std::vector<RTLIL::Cell*> &cells, bool show_tempdir, bool sop_mode, std::string box_file, std::string lut_file,
+		bool /*keepff*/, std::string delay_target, std::string /*lutin_shared*/, bool fast_mode,
+		bool show_tempdir, std::string box_file, std::string lut_file,
 		std::string wire_delay)
 {
 	module = current_module;
@@ -835,7 +835,7 @@ struct Abc9Pass : public Pass {
 		std::string script_file, clk_str, box_file, lut_file;
 		std::string delay_target, lutin_shared = "-S 1", wire_delay;
 		bool fast_mode = false, dff_mode = false, keepff = false, cleanup = true;
-		bool show_tempdir = false, sop_mode = false;
+		bool show_tempdir = false;
 		vector<int> lut_costs;
 		markgroups = false;
 
@@ -997,7 +997,7 @@ struct Abc9Pass : public Pass {
 
 			if (!dff_mode || !clk_str.empty()) {
 				abc9_module(design, mod, script_file, exe_file, cleanup, lut_costs, dff_mode, clk_str, keepff,
-						delay_target, lutin_shared, fast_mode, mod->selected_cells(), show_tempdir, sop_mode,
+						delay_target, lutin_shared, fast_mode, show_tempdir,
 						box_file, lut_file, wire_delay);
 				continue;
 			}
@@ -1143,7 +1143,7 @@ struct Abc9Pass : public Pass {
 				en_polarity = std::get<2>(it.first);
 				en_sig = assign_map(std::get<3>(it.first));
 				abc9_module(design, mod, script_file, exe_file, cleanup, lut_costs, !clk_sig.empty(), "$",
-						keepff, delay_target, lutin_shared, fast_mode, it.second, show_tempdir, sop_mode,
+						keepff, delay_target, lutin_shared, fast_mode, show_tempdir,
 						box_file, lut_file, wire_delay);
 				assign_map.set(mod);
 			}