diff --git a/hw/sparc/Kconfig b/hw/sparc/Kconfig
index 91805afab6..8dcb10086f 100644
--- a/hw/sparc/Kconfig
+++ b/hw/sparc/Kconfig
@@ -14,6 +14,7 @@ config SUN4M
     select M48T59
     select STP2000
     select CHRP_NVRAM
+    select OR_IRQ
 
 config LEON3
     bool
diff --git a/hw/sparc/sun4m.c b/hw/sparc/sun4m.c
index 8686371318..38ca1e33c7 100644
--- a/hw/sparc/sun4m.c
+++ b/hw/sparc/sun4m.c
@@ -50,6 +50,7 @@
 #include "hw/misc/empty_slot.h"
 #include "hw/misc/unimp.h"
 #include "hw/irq.h"
+#include "hw/or-irq.h"
 #include "hw/loader.h"
 #include "elf.h"
 #include "trace.h"
@@ -848,7 +849,7 @@ static void sun4m_hw_init(const struct sun4m_hwdef *hwdef,
     uint32_t initrd_size;
     DriveInfo *fd[MAX_FD];
     FWCfgState *fw_cfg;
-    DeviceState *dev;
+    DeviceState *dev, *ms_kb_orgate, *serial_orgate;
     SysBusDevice *s;
     unsigned int smp_cpus = machine->smp.cpus;
     unsigned int max_cpus = machine->smp.max_cpus;
@@ -994,10 +995,16 @@ static void sun4m_hw_init(const struct sun4m_hwdef *hwdef,
     qdev_prop_set_uint32(dev, "chnAtype", escc_kbd);
     s = SYS_BUS_DEVICE(dev);
     sysbus_realize_and_unref(s, &error_fatal);
-    sysbus_connect_irq(s, 0, slavio_irq[14]);
-    sysbus_connect_irq(s, 1, slavio_irq[14]);
     sysbus_mmio_map(s, 0, hwdef->ms_kb_base);
 
+    /* Logically OR both its IRQs together */
+    ms_kb_orgate = DEVICE(object_new(TYPE_OR_IRQ));
+    object_property_set_int(OBJECT(ms_kb_orgate), "num-lines", 2, &error_fatal);
+    qdev_realize_and_unref(ms_kb_orgate, NULL, &error_fatal);
+    sysbus_connect_irq(s, 0, qdev_get_gpio_in(ms_kb_orgate, 0));
+    sysbus_connect_irq(s, 1, qdev_get_gpio_in(ms_kb_orgate, 1));
+    qdev_connect_gpio_out(DEVICE(ms_kb_orgate), 0, slavio_irq[14]);
+
     dev = qdev_new(TYPE_ESCC);
     qdev_prop_set_uint32(dev, "disabled", 0);
     qdev_prop_set_uint32(dev, "frequency", ESCC_CLOCK);
@@ -1009,10 +1016,17 @@ static void sun4m_hw_init(const struct sun4m_hwdef *hwdef,
 
     s = SYS_BUS_DEVICE(dev);
     sysbus_realize_and_unref(s, &error_fatal);
-    sysbus_connect_irq(s, 0, slavio_irq[15]);
-    sysbus_connect_irq(s, 1,  slavio_irq[15]);
     sysbus_mmio_map(s, 0, hwdef->serial_base);
 
+    /* Logically OR both its IRQs together */
+    serial_orgate = DEVICE(object_new(TYPE_OR_IRQ));
+    object_property_set_int(OBJECT(serial_orgate), "num-lines", 2,
+                            &error_fatal);
+    qdev_realize_and_unref(serial_orgate, NULL, &error_fatal);
+    sysbus_connect_irq(s, 0, qdev_get_gpio_in(serial_orgate, 0));
+    sysbus_connect_irq(s, 1, qdev_get_gpio_in(serial_orgate, 1));
+    qdev_connect_gpio_out(DEVICE(serial_orgate), 0, slavio_irq[15]);
+
     if (hwdef->apc_base) {
         apc_init(hwdef->apc_base, qemu_allocate_irq(cpu_halt_signal, NULL, 0));
     }