juno: Clean a few details in BL2 & BL3-1 plat setup code

Change-Id: Id1cd218baf4e35ad2e82e413b030ac96763a8104

plat/juno/bl2_plat_setup.c

@@ -67,9 +67,6 @@ extern unsigned long __COHERENT_RAM_END__;
 #define BL2_COHERENT_RAM_BASE (unsigned long)(&__COHERENT_RAM_START__)
 #define BL2_COHERENT_RAM_LIMIT (unsigned long)(&__COHERENT_RAM_END__)
 
-/* Pointer to memory visible to both BL2 and BL3-1 for passing data */
-extern unsigned char **bl2_el_change_mem_ptr;
-
 /* Data structure which holds the extents of the trusted RAM for BL2 */
 static meminfo_t bl2_tzram_layout
 __attribute__ ((aligned(PLATFORM_CACHE_LINE_SIZE),
@@ -254,7 +251,7 @@ void bl2_plat_flush_bl31_params(void)
  * Perform the very early platform specific architectural setup here. At the
  * moment this is only intializes the mmu in a quick and dirty way.
  ******************************************************************************/
-void bl2_plat_arch_setup()
+void bl2_plat_arch_setup(void)
 {
 	configure_mmu_el1(bl2_tzram_layout.total_base,
 			  bl2_tzram_layout.total_size,
@@ -264,7 +261,6 @@ void bl2_plat_arch_setup()
 			  BL2_COHERENT_RAM_LIMIT);
 }
 
-
 /*******************************************************************************
  * Before calling this function BL31 is loaded in memory and its entrypoint
  * is set by load_image. This is a placeholder for the platform to change

plat/juno/bl31_plat_setup.c

@@ -107,6 +107,12 @@ void bl31_early_platform_setup(bl31_params_t *from_bl2,
 	/* Initialize the console to provide early debug support */
 	console_init(PL011_UART0_BASE);
 
+	/*
+	 * Check params passed from BL2 should not be NULL,
+	 * We are not checking plat_params_from_bl2 as NULL as we are not
+	 * using it on Juno
+	 */
+	assert(from_bl2 != NULL);
 	assert(from_bl2->h.type == PARAM_BL31);
 	assert(from_bl2->h.version >= VERSION_1);