Bootloader：擦除后存在的有效应用程序

嗨，我想让它工作在一个SD引导程序中，我使用了一个叫做“BootLootsPIC32”的例子（我找不到下载它的链接）。它发生了一些奇怪的事情：在我删除Flash之后，它说在应用程序地址中有一个有效的应用程序。我使用了DSPIC33 EP512GP506MPLAB。X IDE V3.51、XC16 V1.26和MCC V3.23.2.EraseFlash和ValueAppHealthStudio BooDrad GLD FLIMEMAN APP GLD文件您有什么可能发生的想法？也许我错了GLD文件，我很困惑，当我不得不修改。提前感谢。



      以下为原文

    Hi,
I'm trying to make it working a sd bootloader and I'm using part of the example called "Bootloadders PIC32" (I can't find the link where I downloaded it).
It happens something strange: After I erased the flash, it says there is a valid app present in the app address.
I use dsPIC33EP512GP506 MPLAB X IDE v3.51, XC16 v1.26 and MCC v3.26.2.
EraseFlash and ValidAppPresent functions

#define PROGRAM_FLASH_END_ADRESS (0x8000+BMXPFMSZ-1)
#define APP_FLASH_BASE_ADDRESS 0x8000
#define APP_FLASH_END_ADDRESS PROGRAM_FLASH_END_ADRESS
#define USER_APP_RESET_ADDRESS 0xD000
void EraseFlash(void){
void * pFlash;
UINT result;
INT i;
#define BMXPFMSZ 0xA000 // Program Flash Size Register
pFlash = (void*)APP_FLASH_BASE_ADDRESS;
for( i = 0; i < ((APP_FLASH_END_ADDRESS - APP_FLASH_BASE_ADDRESS + 1)/FLASH_PAGE_SIZE); i++ ){
result = NVMemErasePage( pFlash + (i*FLASH_PAGE_SIZE) );
// Assert on NV error. This must be caught during debug phase.
if(result != 0){
// We have a problem. This must be caught during the debug phase.
while(1);
}
}
}
BOOL ValidAppPresent(void){
volatile UINT32 *AppPtr;
AppPtr = (UINT32*)USER_APP_RESET_ADDRESS;
// If vector has some value other than 0xFFFFFFFF then is a valid app
if(*AppPtr == 0xFFFFFFFF){ // <- Always TRUE
return FALSE;
}else{
return TRUE;
}
}

Bootlader gld file

MEMORY
{
data (a!xr) : ORIGIN = 0x1000, LENGTH = 0xC000
reset : ORIGIN = 0x0, LENGTH = 0x4
program (xr) : ORIGIN = 0x200, LENGTH = 0x6A9A
FICD : ORIGIN = 0x557F0, LENGTH = 0x2
FPOR : ORIGIN = 0x557F2, LENGTH = 0x2
FWDT : ORIGIN = 0x557F4, LENGTH = 0x2
FOSC : ORIGIN = 0x557F6, LENGTH = 0x2
FOSCSEL : ORIGIN = 0x557F8, LENGTH = 0x2
FGS : ORIGIN = 0x557FA, LENGTH = 0x2
FUID0 : ORIGIN = 0x800FF8, LENGTH = 0x2
FUID1 : ORIGIN = 0x800FFA, LENGTH = 0x2
FUID2 : ORIGIN = 0x800FFC, LENGTH = 0x2
FUID3 : ORIGIN = 0x800FFE, LENGTH = 0x2
}

Main app gld file

MEMORY
{
data (a!xr) : ORIGIN = 0x1000, LENGTH = 0xC000
reset : ORIGIN = 0xD000, LENGTH = 0x4
ivt : ORIGIN = 0x4, LENGTH = 0x1FC
program (xr) : ORIGIN = 0x8000, LENGTH = 0xB8BA
FICD : ORIGIN = 0x557F0, LENGTH = 0x2
FPOR : ORIGIN = 0x557F2, LENGTH = 0x2
FWDT : ORIGIN = 0x557F4, LENGTH = 0x2
FOSC : ORIGIN = 0x557F6, LENGTH = 0x2
FOSCSEL : ORIGIN = 0x557F8, LENGTH = 0x2
FGS : ORIGIN = 0x557FA, LENGTH = 0x2
FUID0 : ORIGIN = 0x800FF8, LENGTH = 0x2
FUID1 : ORIGIN = 0x800FFA, LENGTH = 0x2
FUID2 : ORIGIN = 0x800FFC, LENGTH = 0x2
FUID3 : ORIGIN = 0x800FFE, LENGTH = 0x2
}

Have you any idea of what can be happened? Maybe I'm wrong with the gld files, I was so confused when I had to modified.
Thanks in advance.