SC6531EFM 平台开机流程.pdf该文档描述了展讯SC6531EFM平台的开机流程，从上电到系

文件名称: SC6531EFM 平台开机流程.pdf

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上传时间: 2019-09-02

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详细说明：该文档描述了展讯SC6531EFM平台的开机流程，从上电到系统起来流程概述 SSPREADTRUM ●开机启动 Rom Code K erne 1 image TECHNOLOGY FOR THE MOBILE WORLD www.spreadtrum.com Rom code SSPREADTRUM ◎概述 ③ Rom code Kernel Image TECHNOLOGY FOR THE MOBILE WORLD www.spreadtrum.com Rom code工作模式 SSPREADTRUM Function dma模式 UART下载模式 USB下载模式 nor Boot模式 TECHNOLOGY FOR THE MOBILE WORLD www.spreadtrum.com Rom code启动流程 SSPREADTRUM Rom Code entry STEP 1 Function DMA Function dma Mode sel s Function dma mode e Is Secure boot STEP 2 Download Download mode Enable Mode sel Out Is Se Boot Enable rshverlfy steP 3 Norboot While(1) TECHNOLOGY FOR THE MOBILE WORLD www.spreadtrum.com Kernel image SSPREADTRUM ○概述 Rom Code O Kernel Image TECHNOLOGY FOR THE MOBILE WORLD www.spreadtrum.com Kernel中断向量表 SSPREADTRUM EXPORT vectors vectors LdR pc,- tx reset Reset goes to startup function Ldr pc,=tx undefined Undefined handler LdR pc,= tx swi interrupt Software interrupt handler LDr pc,= tx prefetch handler Prefetch exeception handler Ldr pc, tx abort handler Abort exception handler dr pc,- tx reserved handler Reserved exception handler dr pc,- tx irg handler IRQ interrupt handler dr pc,= tx fig handler FIQ interrupt handler TECHNOLOGY FOR THE MOBILE WORLD www.spreadtrum.com Ix illdb s SSPREADTRUM Txi11db.s中开机流程: 复位后,手机执行“ LDR pC,= tx reset”,跳到 tx reset处。该部分的代码主要工作为: 关闭中断并设置为SVC模式,建立临时堆栈给SVC模式使用 2.判断是否 Pureassert 3.Adi初始化 4. FLASH CS0地址空间大小 5. Arm clock设置、 Flash clock设置、 PSRAM的初始化 6.设置SVC模式堆栈 7.判断复位原因(若是为看门狗或者未知原因造成的复位,则进入 Assert模式) 8.ARM对IRAM控制权限设置 9.再次设置SVC模式堆栈 10.调用main TECHNOLOGY FOR THE MOBILE WORLD www.spreadtrum.com main SSPREADTRUM Enter main 1. Copies nonroot(Ro and RW) execution regions from their load addresses to their execution addresses 2. Zeroes zi regions 3. Branches to rt entry The library function _rt_entry runs the program as follows 1. Calls rt_stackheap_inito to set up the stack and heap 2. Calls_rt_lib_ inito to initialize referenced library functions, initialize the locale and, if necessary, set up argc and argy for maino 3. Calls maino, the user-level root of the application 4. Calls exit( with the value returned by maino TECHNOLOGY FOR THE MOBILE WORLD www.spreadtrum.com

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