UEFI mini camp

Hello.c

#include  <Uefi.h>
#include  <Library/UefiLib.h>
#include  <Library/UefiBootServicesTableLib.h>
#include  <Library/PrintLib.h>
#include  <Library/BaseMemoryLib.h>
#include  <Library/MemoryAllocationLib.h>
#include  <Protocol/LoadedImage.h>
#include  <Protocol/SimpleFileSystem.h>
#include  "Memory_map.h"
//省略..


EFI_STATUS OpenRootDir(EFI_HANDLE image_handle, EFI_FILE_PROTOCOL** root) {
  EFI_STATUS status;
  EFI_LOADED_IMAGE_PROTOCOL* loaded_image;
  EFI_SIMPLE_FILE_SYSTEM_PROTOCOL* fs;

  status = gBS->OpenProtocol(
      image_handle,
      &gEfiLoadedImageProtocolGuid,
      (VOID**)&loaded_image,
      image_handle,
      NULL,
      EFI_OPEN_PROTOCOL_BY_HANDLE_PROTOCOL);
  if (EFI_ERROR(status)) {
    return status;
  }

  status = gBS->OpenProtocol(
      loaded_image->DeviceHandle,
      &gEfiSimpleFileSystemProtocolGuid,
      (VOID**)&fs,
      image_handle,
      NULL,
      EFI_OPEN_PROTOCOL_BY_HANDLE_PROTOCOL);
  if (EFI_ERROR(status)) {
    return status;
  }

  return fs->OpenVolume(fs, root);
}


EFI_STATUS EFIAPI UefiMain (
    IN EFI_HANDLE image_handle,
    IN EFI_SYSTEM_TABLE *SystemTable
    )
{
  Print(L"Hello EDK II.\n");

	EFI_STATUS status;
  
 //メモリ取得処理省略...

	EFI_FILE_PROTOCOL *root_dir;
	status = OpenRootDir(image_handle, &root_dir);
	if (EFI_ERROR(status)) {
			Print(L"failed to open root directory: %r\n", status);
			Halt();
	}

	Print(L"OpenRootDir : %r\n", status);

  EFI_FILE_PROTOCOL* memmap_file;
  status = root_dir->Open( //ここでDevice Errorが発生
      root_dir, &memmap_file, L"\\memmap",
      EFI_FILE_MODE_READ | EFI_FILE_MODE_WRITE | EFI_FILE_MODE_CREATE, 0);
  if (EFI_ERROR(status)) {
    Print(L"failed to open file '\\memmap': %r\n", status); 
    Print(L"Ignored.\n");
  } else {
    status = SaveMemoryMap(&memmap, memmap_file);
    if (EFI_ERROR(status)) {
      Print(L"failed to save memory map: %r\n", status);
      Halt();
    }
    status = memmap_file->Close(memmap_file);
    if (EFI_ERROR(status)) {
      Print(L"failed to close memory map: %r\n", status);
      Halt();
    }
  }

	while (1);
  return 0;

}

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