Put a bootloader program at the bottom of the flash memory

Here is my linker script. I tried something with a new memory section.

MEMORY
{
  FLASH (rx)      : ORIGIN = 0x08000000, LENGTH = 510K
  MEM_BOOT (rx)   : ORIGIN = 0x0807CFFE, LENGTH = 2K
  RAM (xrw)       : ORIGIN = 0x20000000, LENGTH = 80K
  MEMORY_B1 (rx)  : ORIGIN = 0x60000000, LENGTH = 0K
}

/* Define output sections */
SECTIONS
{
  /* The startup code goes first into FLASH */
  .isr_vector :
  {
    . = ALIGN(4);
    KEEP(*(.isr_vector)) /* Startup code */
    . = ALIGN(4);
  } >FLASH


  .bootsection :
  {
    . = ALIGN(4);
    KEEP(*(.bootsection)) /* Bootloader code */
    . = ALIGN(4);
  } >MEM_BOOT

Here's my boot code. I wrote the flash program, but the erase program is not written yet.

#define MY_BL_FUNCTIONS __attribute__((section(".bootsection")))

void BootLoader(void) MY_BL_FUNCTIONS;
uint8_t Flash_Write(uint32_t StartAddress, uint8_t *p, uint32_t Size) MY_BL_FUNCTIONS;

void BootLoader(void)
{
    char buffer[1000];
    int i = 0;
    /* Test if we enter the bootloader. Toggle the LED and
       send a string to the USART */
    GPIO_ToggleBits(GPIOA, GPIO_Pin_5);
    do
    {
        buffer[i] = Uart2ReadChar();
        i++;
    } while (buffer[i] != '\0');

    SendString(buffer, USART2);
}

uint8_t Flash_Write(uint32_t StartAddress, uint8_t *p, uint32_t Size)
{
    uint32_t idx;
    uint32_t Address;
    __IO FLASH_Status status = FLASH_COMPLETE;

    Address = StartAddress;

    /* Unlock the FLASH program memory */
    FLASH_Unlock();

    /* Clear all pending flags */
    FLASH_ClearFlag(FLASH_FLAG_EOP     |
                    FLASH_FLAG_WRPERR  |
                    FLASH_FLAG_PGAERR  |
                    FLASH_FLAG_SIZERR  |
                    FLASH_FLAG_OPTVERR);

    while (Address < StartAddress + Size)
    {
        status = FLASH_FastProgramWord(Address, *(uint32_t *)p);
        Address = Address + 4;
        p = p + 4;
        if (status != FLASH_COMPLETE)
            return status;
    }

    /* Lock the flash program memory */
    FLASH_Lock();

    return (uint8_t)status;
    }