From e21c86d46cbd243fe68f909c94488d6e4c5e0cda Mon Sep 17 00:00:00 2001
From: OBattler <oubattler@gmail.com>
Date: Fri, 11 Apr 2025 19:58:30 +0200
Subject: [PATCH] PCI TRC Reset: Only zero the RAM on 686 systems, fixes #5462.

---
 src/acpi.c | 4 +---
 src/pci.c  | 3 ++-
 2 files changed, 3 insertions(+), 4 deletions(-)

diff --git a/src/acpi.c b/src/acpi.c
index 963f26ae6..ccd51ebca 100644
--- a/src/acpi.c
+++ b/src/acpi.c
@@ -1025,10 +1025,8 @@ acpi_reg_write_common_regs(UNUSED(int size), uint16_t addr, uint8_t val, void *p
                         nvr_reg_write(0x000f, 0xff, dev->nvr);
                     }
 
-                    if (sus_typ & SUS_RESET_PCI) {
+                    if (sus_typ & SUS_RESET_PCI)
                         device_reset_all(DEVICE_PCI);
-                        mem_zero();
-                    }
 
                     if (sus_typ & SUS_RESET_CPU)
                         cpu_alt_reset = 0;
diff --git a/src/pci.c b/src/pci.c
index c2e4ca237..c3020ca73 100644
--- a/src/pci.c
+++ b/src/pci.c
@@ -420,7 +420,8 @@ pci_trc_reset(uint8_t val)
 
         flushmmucache();
 
-        mem_zero();
+        if (is_p6)
+            mem_zero();
     }
 
 #ifdef USE_DYNAREC