diff options
Diffstat (limited to 'MdePkg/Library/UefiDevicePathLib/DevicePathFromText.c')
-rw-r--r-- | MdePkg/Library/UefiDevicePathLib/DevicePathFromText.c | 11 |
1 files changed, 10 insertions, 1 deletions
diff --git a/MdePkg/Library/UefiDevicePathLib/DevicePathFromText.c b/MdePkg/Library/UefiDevicePathLib/DevicePathFromText.c index 128eb70139..a852fb486f 100644 --- a/MdePkg/Library/UefiDevicePathLib/DevicePathFromText.c +++ b/MdePkg/Library/UefiDevicePathLib/DevicePathFromText.c @@ -919,7 +919,16 @@ DevPathFromTextAcpiExp ( );
AcpiEx->HID = EisaIdFromText (HIDStr);
- AcpiEx->CID = EisaIdFromText (CIDStr);
+ //
+ // According to UEFI spec, the CID parametr is optional and has a default value of 0.
+ // So when the CID parametr is not specified or specified as 0 in the text device node.
+ // Set the CID to 0 in the ACPI extension device path structure.
+ //
+ if (*CIDStr == L'\0' || *CIDStr == L'0') {
+ AcpiEx->CID = 0;
+ } else {
+ AcpiEx->CID = EisaIdFromText (CIDStr);
+ }
AcpiEx->UID = 0;
AsciiStr = (CHAR8 *) ((UINT8 *)AcpiEx + sizeof (ACPI_EXTENDED_HID_DEVICE_PATH));
|