Re: [edk2-platforms][PATCH V3 1/1] WhiskeylakeOpenBoardPkg: Update PCDs to enable stack sharing

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

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

-----Original Message-----
From: Kubacki, Michael A <michael.a.kubacki@intel.com> 
Sent: Tuesday, December 17, 2019 2:52 PM
To: devel@edk2.groups.io
Cc: Chiu, Chasel <chasel.chiu@intel.com>; Desimone, Nathaniel L <nathaniel.l.desimone@intel.com>
Subject: [edk2-platforms][PATCH V3 1/1] WhiskeylakeOpenBoardPkg: Update PCDs to enable stack sharing

From: "Agyeman, Prince" <prince.agyeman@intel.com>

REF: https://bugzilla.tianocore.org/show_bug.cgi?id=2409

Updated WhiskeylakeURvp PCDs to enable FSP/BL stack sharing.

This fixes the boot failure seen with the latest Coffee Lake (CFL) FSP binary (v 7.0.68.41).

Cc: Chasel Chiu <chasel.chiu@intel.com>
Cc: Nate DeSimone <nathaniel.l.desimone@intel.com>
Cc: Michael Kubacki <michael.a.kubacki@intel.com>
Co-authored-by: Michael Kubacki <michael.a.kubacki@intel.com>
Signed-off-by: Prince Agyeman <prince.agyeman@intel.com>
Reviewed-by: Chasel Chiu <chasel.chiu@intel.com>
---

Notes:
    1. Michael Kubacki is taking over patch ownership since Prince
       is out of office.
    
    V3 Change:
      - Changed the value of PcdPeiTemporaryRamStackSize to 0x30000
        to exceed the minimum stack size specified in the Coffee Lake
        FSP Integration Guide (160KB / 0x28000) with some padding.
    
    V2 Change:
      - The value of PcdPeiTemporaryRamStackSize was changed from 0x40000
        to 0x28000 to exactly meet the minimum stack size specified in
        the Coffee Lake FSP Integration Guide. Note that the memory
        initialization code in the FSP previously exceeded the available
        stack size.

 Platform/Intel/WhiskeylakeOpenBoardPkg/WhiskeylakeURvp/OpenBoardPkgPcd.dsc | 11 +++++------
 1 file changed, 5 insertions(+), 6 deletions(-)

diff --git a/Platform/Intel/WhiskeylakeOpenBoardPkg/WhiskeylakeURvp/OpenBoardPkgPcd.dsc b/Platform/Intel/WhiskeylakeOpenBoardPkg/WhiskeylakeURvp/OpenBoardPkgPcd.dsc
index 906f7b7ade..1ae51d9d5e 100644
--- a/Platform/Intel/WhiskeylakeOpenBoardPkg/WhiskeylakeURvp/OpenBoardPkgPcd.dsc
+++ b/Platform/Intel/WhiskeylakeOpenBoardPkg/WhiskeylakeURvp/OpenBoardPk
+++ gPcd.dsc
@@ -54,15 +54,14 @@
   gSiPkgTokenSpaceGuid.PcdTsegSize|0x1000000
 
   #
-  # FSP API mode does not share stack with the boot loader,
-  # so FSP needs more temporary memory for FSP heap + stack size.
+  # When sharing stack with boot loader, FSP only needs small temp ram 
+ for heap
   #
-  gIntelFsp2PkgTokenSpaceGuid.PcdFspTemporaryRamSize|0x26000
+  gIntelFsp2PkgTokenSpaceGuid.PcdFspTemporaryRamSize|0x10000
+
   #
-  # FSP API mode does not need to enlarge the boot loader stack size
-  # since the stacks are separate.
+  # Boot loader stack size has to be big enough to executing FSP
   #
-  gSiPkgTokenSpaceGuid.PcdPeiTemporaryRamStackSize|0x20000
+  gSiPkgTokenSpaceGuid.PcdPeiTemporaryRamStackSize|0x30000
 
   gEfiMdePkgTokenSpaceGuid.PcdPciExpressBaseAddress|0xE0000000
   gMinPlatformPkgTokenSpaceGuid.PcdPciExpressRegionLength|0x10000000
--
2.16.2.windows.1