diff --git a/root/root.S b/root/root.S
index 095fa72..452adef 100644
--- a/root/root.S
+++ b/root/root.S
@@ -10,8 +10,11 @@ _start:
 	la	t0, msg
 .loop:
 	lb	a2, 0(t0)
-	beqz	a2, _start	# print forever
-	syscall (1<<12 | 1), 1	# see uapi/syscall.rs
+	beqz	a2, _start
+	# see uapi/syscall.rs
+	# msg: label = DebugPutChar, length = 3
+	# ptr: self-referential to cspace, just to create a valid cptr
+	syscall (1<<12 | 3), 0x0202020202020202
 	addi	t0, t0, 1
 	j	.loop