ATF启动（六）：bl32（OP-TEE）--＞bl33 ATF ending

前言

前面BL31里面函数 bl31_main

void bl31_main(void)
{
	NOTICE("BL31: %s\n", version_string);
	NOTICE("BL31: %s\n", build_message);
 
	/* Perform platform setup in BL31 */
	bl31_platform_setup();	//初始化相关驱动，时钟等
 
	/* Initialise helper libraries */
	bl31_lib_init();	//用于执行bl31软件中相关全局变量的初始化
 
	/* Initialize the runtime services e.g. psci. */
	INFO("BL31: Initializing runtime services\n");
	runtime_svc_init();	//初始化el3中的service，通过在编译时指定特定的section来确定哪些service会被作为el3 service
 
	/*
	 * All the cold boot actions on the primary cpu are done. We now need to
	 * decide which is the next image (BL32 or BL33) and how to execute it.
	 * If the SPD runtime service is present, it would want to pass control
	 * to BL32 first in S-EL1. In that case, SPD would have registered a
	 * function to intialize bl32 where it takes responsibility of entering
	 * S-EL1 and returning control back to bl31_main. Once this is done we
	 * can pre
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