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-rw-r--r--MdeModulePkg/MdeModulePkg.dec3
1 files changed, 2 insertions, 1 deletions
diff --git a/MdeModulePkg/MdeModulePkg.dec b/MdeModulePkg/MdeModulePkg.dec
index d14cf8b56b..51bafbb44e 100644
--- a/MdeModulePkg/MdeModulePkg.dec
+++ b/MdeModulePkg/MdeModulePkg.dec
@@ -219,7 +219,8 @@
gEfiMdeModulePkgTokenSpaceGuid.PcdPeiCoreImageLoaderSearchTeSectionFirst|TRUE|BOOLEAN|0x00010044
## If TRUE, force to switch off the support of legacy usb. So legacy usb device driver can not make use of SMI
- # interrupt to access usb device in the case of absence of usb stack.
+ # interrupt to access usb device in the case of absence of usb stack.
+ # DUET platform requires the token to be TRUE.
gEfiMdeModulePkgTokenSpaceGuid.PcdTurnOffUsbLegacySupport|FALSE|BOOLEAN|0x00010047
## If TRUE, HiiImageProtocol will be installed.