Function DiscoverUserArea

MdeModulePkg/Bus/Sd/SdDxe/SdDxe.c:179–263

Discover user area partition in the SD device. @param[in] Device The pointer to the SD_DEVICE data structure. @retval EFI_SUCCESS The user area partition in the SD device is successfully identified. @return Others Some error occurs when identifying the user area. **/

**/
EFI_STATUS
DiscoverUserArea (
  IN SD_DEVICE             *Device
  )
{
  EFI_STATUS                        Status;
  SD_CSD                            *Csd;
  SD_CSD2                           *Csd2;
  SD_CID                            *Cid;
  UINT64                            Capacity;
  UINT32                            DevStatus;
  UINT16                            Rca;
  UINT32                            CSize;
  UINT32                            CSizeMul;
  UINT32                            ReadBlLen;

  //
  // Deselect the device to force it enter stby mode.
  // Note here we don't judge return status as some SD devices return
  // error but the state has been stby.
  //
  SdSelect (Device, 0);

  Status = SdSetRca (Device, &Rca);
  if (EFI_ERROR(Status)) {
    DEBUG ((EFI_D_ERROR, "DiscoverUserArea(): Assign new Rca = 0x%x fails with %r\n", Rca, Status));
    return Status;
  }

  Csd    = &Device->Csd;
  Status = SdGetCsd (Device, Rca, Csd);
  if (EFI_ERROR(Status)) {
    return Status;
  }
  DumpCsd (Csd);

  Cid    = &Device->Cid;
  Status = SdGetCid (Device, Rca, Cid);
  if (EFI_ERROR(Status)) {
    return Status;
  }
  GetSdModelName (Device, Cid);

  Status = SdSelect (Device, Rca);
  if (EFI_ERROR(Status)) {
    DEBUG ((EFI_D_ERROR, "DiscoverUserArea(): Reselect the device 0x%x fails with %r\n", Rca, Status));
    return Status;
  }

  Status = SdSendStatus (Device, Rca, &DevStatus);
  if (EFI_ERROR(Status)) {
    return Status;
  }

  if (Csd->CsdStructure == 0) {
    Device->SectorAddressing = FALSE;
    CSize     = (Csd->CSizeHigh << 2 | Csd->CSizeLow) + 1;
    CSizeMul  = (1 << (Csd->CSizeMul + 2));