File 0001-OvmfPkg-RiscVVirt-PlatformPei-Do-not-set-PcdTpmBaseA.patch of Package ovmf

From b804e02f3402791e7b0d201b090de685d17d4800 Mon Sep 17 00:00:00 2001
From: Fabian Vogt <fvogt@suse.de>
Date: Fri, 6 Mar 2026 14:19:59 +0100
Subject: [PATCH] OvmfPkg/RiscVVirt/PlatformPei: Do not set PcdTpmBaseAddress
 to garbage

If there is no TPM device in the device tree, the TpmBase variable is not
initialized and contains garbage.

Instead of using 0 as sentinel (which may be a valid address), check the
size instead, which cannot be 0 for a memory-mapped device.

Signed-off-by: Fabian Vogt <fvogt@suse.de>
---
 OvmfPkg/RiscVVirt/PlatformPei/PlatformPeim.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/OvmfPkg/RiscVVirt/PlatformPei/PlatformPeim.c b/OvmfPkg/RiscVVirt/PlatformPei/PlatformPeim.c
index 3da71aa51b..fa157b4169 100644
--- a/OvmfPkg/RiscVVirt/PlatformPei/PlatformPeim.c
+++ b/OvmfPkg/RiscVVirt/PlatformPei/PlatformPeim.c
@@ -119,6 +119,11 @@ SetupTPMResources (
   UINT64        TpmBase;
   UINT64        TpmBaseSize;
 
+  //
+  // Empty TpmBaseSize indicates no TPM found.
+  //
+  TpmBaseSize = 0;
+
   //
   // Set Parent to suppress incorrect compiler/analyzer warnings.
   //
@@ -200,7 +205,7 @@ SetupTPMResources (
     }
   }
 
-  if (TpmBase) {
+  if (TpmBaseSize > 0) {
     BuildResourceDescriptorHob (
       EFI_RESOURCE_MEMORY_MAPPED_IO,
       EFI_RESOURCE_ATTRIBUTE_PRESENT     |
-- 
2.52.0