OALGetSiliconIdCode 实现

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TI的 BSP源代码中只有声明 extern UINT32 OALGetSiliconIdCode();

源代码中找不到实现，其实是在对应的getidcode.s汇编文件里面实现的：

;; Copyright (c) Microsoft Corporation.  All rights reserved.;;; Use of this source code is subject to the terms of the Microsoft end-user; license agreement (EULA) under which you licensed this SOFTWARE PRODUCT.; If you did not accept the terms of the EULA, you are not authorized to use; this source code. For a copy of the EULA, please see the LICENSE.RTF on your; install media.;;-------------------------------------------------------------------------------;;  File: getidcode.s;;  This file implement OALGetIdCode function. This implementaion should;  work on most ARM based SoC.;        INCLUDE kxarm.h        INCLUDE armmacros.s        TEXTAREA;-------------------------------------------------------------------------------;;  Function:  OALGetSiliconIdCode;;  The Silicon ID Code value will be returned in r0.;        LEAF_ENTRY OALGetSiliconIdCode        mrc     p15, 1, r0, c0, c0, 7        RETURN        END

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