[PATCH] MdeModulePkg/UefiBootManagerLib: Generate boot description for SD/eMMC

[Hao Wu <hao.a.wu@intel.com>]

REF:https://bugzilla.tianocore.org/show_bug.cgi?id=620

Adds the support for SD/eMMC device path to show as a boot option.

The CID register content (returned from DiskInfo->Inquiry) seems do not
provide very useful/readable 'OEM/Application ID' and 'Product name'
field.

For SD devices, the OID is a 2-character ASCII string and the Product name
is a 5-character ASCII string.

For eMMC devices, the OID is an 8-bit binary number and the Product name
is a 6-character ASCII string.

These strings are relatively short and do not provide a very readable
description. Hence, this commit uses general 'SD (eMMC) Device' for the
boot option description.

Cc: Ruiyu Ni <ruiyu.ni@intel.com>
Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: Hao Wu <hao.a.wu@intel.com>
---
 .../Library/UefiBootManagerLib/BmBootDescription.c | 23 ++++++++++++++++++++++
 .../UefiBootManagerLib/UefiBootManagerLib.inf      |  1 +
 2 files changed, 24 insertions(+)

diff --git a/MdeModulePkg/Library/UefiBootManagerLib/BmBootDescription.c b/MdeModulePkg/Library/UefiBootManagerLib/BmBootDescription.c
index 7647bac2d0..d56c3e7e2c 100644
--- a/MdeModulePkg/Library/UefiBootManagerLib/BmBootDescription.c
+++ b/MdeModulePkg/Library/UefiBootManagerLib/BmBootDescription.c
@@ -155,6 +155,7 @@ BmGetDescriptionFromDiskInfo (
   CONST UINTN                  SerialNumberLength = 20;
   CHAR8                        *StrPtr;
   UINT8                        Temp;
+  EFI_DEVICE_PATH_PROTOCOL     *DevicePath;
 
   Description  = NULL;
 
@@ -229,6 +230,28 @@ BmGetDescriptionFromDiskInfo (
 
       BmEliminateExtraSpaces (Description);
     }
+  } else if (CompareGuid (&DiskInfo->Interface, &gEfiDiskInfoSdMmcInterfaceGuid)) {
+    DevicePath = DevicePathFromHandle (Handle);
+    if (DevicePath == NULL) {
+      return NULL;
+    }
+
+    while (!IsDevicePathEnd (DevicePath) && (DevicePathType (DevicePath) != MESSAGING_DEVICE_PATH)) {
+      DevicePath = NextDevicePathNode (DevicePath);
+    }
+    if (IsDevicePathEnd (DevicePath)) {
+      return NULL;
+    }
+
+    if (DevicePathSubType (DevicePath) == MSG_SD_DP) {
+      Description = L"SD Device";
+    } else if (DevicePathSubType (DevicePath) == MSG_EMMC_DP) {
+      Description = L"eMMC Device";
+    } else {
+      return NULL;
+    }
+
+    Description = AllocateCopyPool (StrSize (Description), Description);
   }
 
   return Description;
diff --git a/MdeModulePkg/Library/UefiBootManagerLib/UefiBootManagerLib.inf b/MdeModulePkg/Library/UefiBootManagerLib/UefiBootManagerLib.inf
index 264d726c26..ad4901db57 100644
--- a/MdeModulePkg/Library/UefiBootManagerLib/UefiBootManagerLib.inf
+++ b/MdeModulePkg/Library/UefiBootManagerLib/UefiBootManagerLib.inf
@@ -91,6 +91,7 @@
   gEfiDiskInfoAhciInterfaceGuid                 ## SOMETIMES_CONSUMES ## GUID
   gEfiDiskInfoIdeInterfaceGuid                  ## SOMETIMES_CONSUMES ## GUID
   gEfiDiskInfoScsiInterfaceGuid                 ## SOMETIMES_CONSUMES ## GUID
+  gEfiDiskInfoSdMmcInterfaceGuid                ## SOMETIMES_CONSUMES ## GUID
 
 [Protocols]
   gEfiPciRootBridgeIoProtocolGuid               ## CONSUMES
-- 
2.12.0.windows.1