--- a/libcommon/backend.c	Sat Mar 20 21:53:31 2021 +0000
+++ b/libcommon/backend.c	Sun Mar 21 01:56:49 2021 +0000
@@ -7,12 +7,15 @@
 #include <stdlib.h>
 #include <unistd.h>
 
-extern unsigned calypso_fd, pcsc_reader_num;
+extern unsigned calypso_fd, pcsc_reader_num, serial_spenh;
+extern int use_pcsc;
+extern char *serial_device, *serial_baud;
 
 static char calypso_be_pathname[] = "/opt/freecalypso/bin/fcsim-calypso-be";
+static char serial_be_pathname[] = "/opt/freecalypso/bin/fcsim-serial-be";
 static char pcsc_be_pathname[] = "/opt/freecalypso/bin/fc-pcsc-backend";
 
-static char *backend_prog, *backend_argv[3], backend_optarg[16];
+static char *backend_prog, *backend_argv[4], backend_optarg[16];
 
 FILE *cpipeF, *rpipeF;
 
@@ -36,14 +39,36 @@
 	backend_argv[2] = 0;
 }
 
+static void
+setup_be_serial()
+{
+	backend_prog = serial_be_pathname;
+	backend_argv[0] = "fcsim-serial-be";
+	backend_argv[1] = serial_device;
+	if (serial_baud)
+		backend_argv[2] = serial_baud;
+	else if (serial_spenh) {
+		sprintf(backend_optarg, "9600,55800,%u", serial_spenh);
+		backend_argv[2] = backend_optarg;
+	} else
+		backend_argv[2] = "9600";
+	backend_argv[3] = 0;
+}
+
 launch_backend()
 {
 	int cpipe[2], rpipe[2], rc;
 
 	if (calypso_fd)
 		setup_be_calypso();
-	else
+	else if (use_pcsc)
 		setup_be_pcsc();
+	else if (serial_device)
+		setup_be_serial();
+	else {
+		fprintf(stderr, "error: no -d or -p target selected\n");
+		exit(1);
+	}
 	if (pipe(cpipe) < 0 || pipe(rpipe) < 0) {
 		perror("pipe");
 		exit(1);