Microchip PolarFire SoC expects U51/U54 cores,
the SiFive Freedom board: the E31/E51 and U34/U54.

Do not allow any other CPU type by setting the cluster
'cpu-type' property.

Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
---
 hw/riscv/microchip_pfsoc.c | 4 ++++
 hw/riscv/sifive_u.c        | 2 ++
 2 files changed, 6 insertions(+)

diff --git a/hw/riscv/microchip_pfsoc.c b/hw/riscv/microchip_pfsoc.c
index 2b91e49561..658307fdfb 100644
--- a/hw/riscv/microchip_pfsoc.c
+++ b/hw/riscv/microchip_pfsoc.c
@@ -150,6 +150,8 @@ static void microchip_pfsoc_soc_instance_init(Object *obj)
 
     object_initialize_child(obj, "e-cluster", &s->e_cluster, TYPE_CPU_CLUSTER);
     qdev_prop_set_uint32(DEVICE(&s->e_cluster), "cluster-id", 0);
+    qdev_prop_set_string(DEVICE(&s->e_cluster), "cpu-type",
+                         TYPE_RISCV_CPU_SIFIVE_E51);
 
     object_initialize_child(OBJECT(&s->e_cluster), "e-cpus", &s->e_cpus,
                             TYPE_RISCV_HART_ARRAY);
@@ -161,6 +163,8 @@ static void microchip_pfsoc_soc_instance_init(Object *obj)
 
     object_initialize_child(obj, "u-cluster", &s->u_cluster, TYPE_CPU_CLUSTER);
     qdev_prop_set_uint32(DEVICE(&s->u_cluster), "cluster-id", 1);
+    qdev_prop_set_string(DEVICE(&s->e_cluster), "cpu-type",
+                         TYPE_RISCV_CPU_SIFIVE_U54);
 
     object_initialize_child(OBJECT(&s->u_cluster), "u-cpus", &s->u_cpus,
                             TYPE_RISCV_HART_ARRAY);
diff --git a/hw/riscv/sifive_u.c b/hw/riscv/sifive_u.c
index d3ab7a9cda..d0535746ca 100644
--- a/hw/riscv/sifive_u.c
+++ b/hw/riscv/sifive_u.c
@@ -763,6 +763,7 @@ static void sifive_u_soc_instance_init(Object *obj)
 
     object_initialize_child(obj, "e-cluster", &s->e_cluster, TYPE_CPU_CLUSTER);
     qdev_prop_set_uint32(DEVICE(&s->e_cluster), "cluster-id", 0);
+    qdev_prop_set_string(DEVICE(&s->e_cluster), "cpu-type", SIFIVE_E_CPU);
 
     object_initialize_child(OBJECT(&s->e_cluster), "e-cpus", &s->e_cpus,
                             TYPE_RISCV_HART_ARRAY);
@@ -813,6 +814,7 @@ static void sifive_u_soc_realize(DeviceState *dev, Error **errp)
      * CPU must exist and have been parented into the cluster before the
      * cluster is realized.
      */
+    qdev_prop_set_string(DEVICE(&s->u_cluster), "cpu-type", s->cpu_type);
     qdev_realize(DEVICE(&s->e_cluster), NULL, &error_abort);
     qdev_realize(DEVICE(&s->u_cluster), NULL, &error_abort);
 
-- 
2.38.1