zynq使用software reset（軟復位）實現重加載

1.實現原理

在圖中，軟復位實現ram清除並從新調用Bootrom實現從flash重新加載
2.實現代碼

#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，絕對地址，
#define SLCR_UNLOCK_ADDR 0xF8000008 //SLCR_UNLOCK寄存器，絕對地址，
#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 //復位碼

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); //復位
}

採用簡單的hello word方式實現
3.實現流程
將應用程序固化到flash中，每10s會重複打印Hello World，驗證啓動成功