zynq使用software reset（軟複位）實作重加載

1.實作原理

在圖中，軟複位實作ram清除并從新調用Bootrom實作從flash重新加載

2.實作代碼

#include <stdio.h>

#include “platform.h”

#include “xil_printf.h”

#include “xil_io.h”

#define PSS_RST_CTRL_REG 0xF8000200 //PSS_RST_CTRL寄存器，絕對位址，

#define SLCR_UNLOCK_ADDR 0xF8000008 //SLCR_UNLOCK寄存器，絕對位址，

#define UNLOCK_KEY 0xDF0D //使能碼

//Write the unlock key, 0xDF0D, to enable writes to
                                              //the slcr registers. All slcr registers, 0xF800_0000
                                              //to 0xF800_0B74, are writeable until locked using
                                              //the SLCR_LOCK register. A read of this register
                                              //returns zero.
           

#define PSS_RST_MASK 0x01 //複位碼

int main()

{

init_platform();

print("Hello World\n\r");
sleep(10);
PsSoftwareReset();
cleanup_platform();
return 0;
           

}

void PsSoftwareReset(void)

{

Xil_Out32(SLCR_UNLOCK_ADDR, UNLOCK_KEY); //寫使能

Xil_Out32(PSS_RST_CTRL_REG, PSS_RST_MASK); //複位

}

采用簡單的hello word方式實作

3.實作流程

将應用程式固化到flash中，每10s會重複列印Hello World，驗證啟動成功