diff --git a/README.md b/README.md
index c2d1951..149747d 100755
--- a/README.md
+++ b/README.md
@@ -46,3 +46,20 @@ environment variable must point to the folder where the platform was installed (
 
     $ export VSIM_PATH=<pulpissimo root folder>/sim
 
+### Examples
+
+Some examples can be found here: git@github.com:pulp-platform/pulp-runtime-examples.git
+
+### Useful options
+
+The vsim gui can be opened with this option:
+
+    $ make run gui=1
+
+The uart can be selected for the printf with this option:
+
+    $ make all run io=uart
+
+The baudrate can also be specified with:
+
+    $ make all run io=uart CONFIG_IO_UART_BAUDRATE=9600
\ No newline at end of file
diff --git a/include/pulp.h b/include/pulp.h
index 4df143c..bf97959 100755
--- a/include/pulp.h
+++ b/include/pulp.h
@@ -34,7 +34,7 @@ typedef enum {
   PI_FREQ_DOMAIN_PERIPH = 2
 } pi_freq_domain_e;
 
-void cluster_start(int cid, int (*entry)(void *));
+void cluster_start(int cid, int (*entry)());
 
 int cluster_wait(int cid);
 
@@ -45,6 +45,7 @@ void _start();
 #define get_core_id hal_core_id
 #define rt_core_id hal_core_id
 #define rt_cluster_id hal_cluster_id
+#define get_cluster_id hal_cluster_id
 
 #ifdef ARCHI_CLUSTER_NB_PE
 static inline int get_core_num() { return ARCHI_CLUSTER_NB_PE; }
diff --git a/kernel/cluster.c b/kernel/cluster.c
index 2e9a756..ff02de2 100644
--- a/kernel/cluster.c
+++ b/kernel/cluster.c
@@ -54,7 +54,7 @@ void cluster_entry_stub()
 }
 
 
-void cluster_start(int cid, int (*entry)(void *))
+void cluster_start(int cid, int (*entry)())
 {
     // Store cluster entry point, ctr0 will jump here
     cluster_entry = entry;