Hello Everyone,

I'm working on a project with edk2, and these guys are trying to port edk2 to STM32MP25 platforms. I have a problem with the module SerialPortLib, specifically the function SerialPortPoll. I made a test that adds a line of debug in this function and adds a MmioWrite8 to a forbidden address  of my platform but I don't see anything. This demonstrates that I cannot access this function (this function is not loaded). Do you know why and how to solve this?

Here is my function SerialPortPoll

BOOLEAN

EFIAPI
SerialPortPoll (
  VOID
  )
{
  DEBUG ((DEBUG_INFO, "In SerialPortPollllllllllllllllllllllllllllllll\n"));
  MmioWrite8(0x80000000, 0xff);
  return FALSE;
}

And here is my function SerialPortWrite that works well because I can see the boot log message

UINTN
EFIAPI
SerialPortWrite (
  IN UINT8     *Buffer,
  IN UINTN     NumberOfBytes
)
{
  UINT8 *CONST  Final = &Buffer[NumberOfBytes];
  while (Buffer < Final) {
    // Wait until UART able to accept another char
    while (!(MmioRead32 (USART2_BASE + R_UART_ISR) & (1<<7))) {
    }
    MmioWrite8 (USART2_BASE + R_UART_TDR, *Buffer++);
  }
  DEBUG ((DEBUG_INFO, "end SerialPortWriteeeeeeeeeeeeeeeee\n"));

  return NumberOfBytes;
}

Thanks