OvmfPkg: mention the extended TSEG near the PcdQ35TsegMbytes declaration

PlatformPei can now overwrite PcdQ35TsegMbytes; document this in
"OvmfPkg/OvmfPkg.dec".

Cc: Jordan Justen <jordan.l.justen@intel.com>
Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Laszlo Ersek <lersek@redhat.com>
Reviewed-by: Jordan Justen <jordan.l.justen@intel.com>

diff --git a/OvmfPkg/OvmfPkg.dec b/OvmfPkg/OvmfPkg.dec
index c46b72f069efe7c8d827fb3e82e1b6e0841b467a..e5f74a1248ed084e455fa52f3eac929f61b03f3e 100644 (file)
--- a/OvmfPkg/OvmfPkg.dec
+++ b/OvmfPkg/OvmfPkg.dec
@@ -129,10 +129,11 @@
   gUefiOvmfPkgTokenSpaceGuid.PcdPciMmio64Size|0x0|UINT64|0x27\r
 \r
   ## The following setting controls how many megabytes we configure as TSEG on\r
-  #  Q35, for SMRAM purposes. Permitted values are: 1, 2, 8. Other values cause\r
-  #  undefined behavior.\r
+  #  Q35, for SMRAM purposes. Permitted defaults are: 1, 2, 8. Other defaults\r
+  #  cause undefined behavior. During boot, the PCD is updated by PlatformPei\r
+  #  to reflect the extended TSEG size, if one is advertized by QEMU.\r
   #\r
-  #  This PCD is only consulted if PcdSmmSmramRequire is TRUE (see below).\r
+  #  This PCD is only accessed if PcdSmmSmramRequire is TRUE (see below).\r
   gUefiOvmfPkgTokenSpaceGuid.PcdQ35TsegMbytes|8|UINT16|0x20\r
 \r
 [PcdsFeatureFlag]\r