Re: [edk2-platforms: PATCH] KabylakeOpenBoardPkg: Missed 64KB Temporary RAM in Dispatch mode.

["Nate DeSimone" <nathaniel.l.desimone@intel.com>]

Reviewed-by: Nate DeSimone <nathaniel.l.desimone@intel.com>

-----Original Message-----
From: Chiu, Chasel 
Sent: Friday, September 6, 2019 12:01 AM
To: devel@edk2.groups.io
Cc: Kubacki, Michael A <michael.a.kubacki@intel.com>; Desimone, Nathaniel L <nathaniel.l.desimone@intel.com>; Gao, Liming <liming.gao@intel.com>
Subject: [edk2-platforms: PATCH] KabylakeOpenBoardPkg: Missed 64KB Temporary RAM in Dispatch mode.

REF: https://bugzilla.tianocore.org/show_bug.cgi?id=2159

FSP Dispatch mode will share same stack and heap with bootloader so we should not reserve separate temporary ram for FSP.
Set PcdFspTemporaryRamSize to 0 in Dispatch mode.

Test: internal platform can boot with FSP Dispatch mode
      with 64KB temporary RAM back.

Cc: Michael Kubacki <michael.a.kubacki@intel.com>
Cc: Nate DeSimone <nathaniel.l.desimone@intel.com>
Cc: Liming Gao <liming.gao@intel.com>
Signed-off-by: Chasel Chiu <chasel.chiu@intel.com>
---
 Platform/Intel/KabylakeOpenBoardPkg/KabylakeRvp3/OpenBoardPkgPcd.dsc | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/Platform/Intel/KabylakeOpenBoardPkg/KabylakeRvp3/OpenBoardPkgPcd.dsc b/Platform/Intel/KabylakeOpenBoardPkg/KabylakeRvp3/OpenBoardPkgPcd.dsc
index 55ae9f47ac..2009bb225a 100644
--- a/Platform/Intel/KabylakeOpenBoardPkg/KabylakeRvp3/OpenBoardPkgPcd.dsc
+++ b/Platform/Intel/KabylakeOpenBoardPkg/KabylakeRvp3/OpenBoardPkgPcd.d
+++ sc
@@ -69,10 +69,10 @@
   gSiPkgTokenSpaceGuid.PcdPeiTemporaryRamStackSize|0x20000
 !else
   #
-  # FSP Dispatch mode will share the same stack with boot loader,
-  # here temporary ram size is used by FSP heap and can be smaller
+  # FSP Dispatch mode will share the same stack and heap with boot 
+ loader,  # no separate temporary ram required by FSP.
   #
-  gIntelFsp2PkgTokenSpaceGuid.PcdFspTemporaryRamSize        | 0x00010000
+  gIntelFsp2PkgTokenSpaceGuid.PcdFspTemporaryRamSize        | 0
 
   #
   # In FSP Dispatch mode boot loader stack size must be big enough for executing
--
2.13.3.windows.1