SignedCapsulePkg: add PcdLowestSupportedFirmwareVersion

Add a PCD that holds the lowest supported version number, so that we
can allow the platform to configure this at build time.

Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Reviewed-by: Star Zeng <star.zeng@intel.com>
Reviewed-by: Jiewen Yao <jiewen.yao@intel.com>

diff --git a/SignedCapsulePkg/SignedCapsulePkg.dec b/SignedCapsulePkg/SignedCapsulePkg.dec
index b27e87409b19b85da6de75c67ac70a80e4e54029..f06e07656de99617dd27a91284b88b4ec95c6b59 100644 (file)
--- a/SignedCapsulePkg/SignedCapsulePkg.dec
+++ b/SignedCapsulePkg/SignedCapsulePkg.dec
@@ -52,6 +52,10 @@
   # @Prompt GUID of the FFS which contains the Pkcs7TestPublicKeyFile.\r
   gEfiSignedCapsulePkgTokenSpaceGuid.PcdEdkiiPkcs7TestPublicKeyFileGuid|{0xba, 0xf5, 0x93, 0xf0, 0x37, 0x6f, 0x16, 0x48, 0x9e, 0x52, 0x91, 0xbe, 0xa0, 0xf7, 0xe0, 0xb8}|VOID*|0xA0010002\r
 \r
+  ## This is the lowest supported version number that can be upgraded to, as exposed via the System Firmware descriptor.\r
+  # @Prompt Lowest support version number that can be upgraded to via capsule update\r
+  gEfiSignedCapsulePkgTokenSpaceGuid.PcdLowestSupportedFirmwareVersion|0x1|UINT32|0xA0010003\r
+\r
 [PcdsDynamicEx]\r
   ## This dynamic PCD holds the EDKII system firmware image descriptor.\r
   #  This information can be used for version check in EDKII system FMP capsule.\r