diff --git a/usr/src/cmd/bhyve/pci_lpc.c b/usr/src/cmd/bhyve/pci_lpc.c
--- a/usr/src/cmd/bhyve/pci_lpc.c
+++ b/usr/src/cmd/bhyve/pci_lpc.c
@@ -72,7 +72,7 @@
 
 static const char *romfile;
 
-#define	LPC_UART_NUM	2
+#define	LPC_UART_NUM	4
 static struct lpc_uart_softc {
 	struct uart_softc *uart_softc;
 	const char *opts;
@@ -81,7 +81,7 @@
 	int	enabled;
 } lpc_uart_softc[LPC_UART_NUM];
 
-static const char *lpc_uart_names[LPC_UART_NUM] = { "COM1", "COM2" };
+static const char *lpc_uart_names[LPC_UART_NUM] = { "COM1", "COM2", "COM3", "COM4" };
 
 /*
  * LPC device configuration is in the following form:
diff --git a/usr/src/cmd/bhyve/uart_emul.c b/usr/src/cmd/bhyve/uart_emul.c
--- a/usr/src/cmd/bhyve/uart_emul.c
+++ b/usr/src/cmd/bhyve/uart_emul.c
@@ -77,6 +77,10 @@
 #define	COM1_IRQ	4
 #define	COM2_BASE	0x2F8
 #define	COM2_IRQ	3
+#define	COM3_BASE	0x3E8
+#define	COM3_IRQ	4
+#define	COM4_BASE	0x2E8
+#define	COM4_IRQ	3
 
 #define	DEFAULT_RCLK	1843200
 #define	DEFAULT_BAUD	9600
@@ -104,6 +108,8 @@
 } uart_lres[] = {
 	{ COM1_BASE, COM1_IRQ, false},
 	{ COM2_BASE, COM2_IRQ, false},
+	{ COM3_BASE, COM3_IRQ, false},
+	{ COM4_BASE, COM4_IRQ, false},
 };
 
 #define	UART_NLDEVS	(sizeof(uart_lres) / sizeof(uart_lres[0]))