diff --git a/arch/arm/mach-imx/mx6/mp.c b/arch/arm/mach-imx/mx6/mp.c
index c3806dc..eda168d 100644
--- a/arch/arm/mach-imx/mx6/mp.c
+++ b/arch/arm/mach-imx/mx6/mp.c
@@ -29,20 +29,20 @@
 	SRC_SCR_CORE_3_ENABLE_MASK
 };
 
-int cpu_reset(int nr)
+int cpu_reset(u32 nr)
 {
 	/* Software reset of the CPU N */
 	src->scr |= cpu_reset_mask[nr];
 	return 0;
 }
 
-int cpu_status(int nr)
+int cpu_status(u32 nr)
 {
 	printf("core %d => %d\n", nr, !!(src->scr & cpu_ctrl_mask[nr]));
 	return 0;
 }
 
-int cpu_release(int nr, int argc, char *const argv[])
+int cpu_release(u32 nr, int argc, char *const argv[])
 {
 	uint32_t boot_addr;
 
@@ -78,7 +78,7 @@
 	return 1;
 }
 
-int cpu_disable(int nr)
+int cpu_disable(u32 nr)
 {
 	/* Disable the CPU N */
 	src->scr &= ~cpu_ctrl_mask[nr];