From 021fa1e4d71fefd1aac8aab262feff8ab0c0c445 Mon Sep 17 00:00:00 2001
From: Zhuowei Zhang <zhuoweizhang@yahoo.com>
Date: Sat, 23 Feb 2019 18:17:33 -0800
Subject: [PATCH] SimpleFbDxe: also flush cache after initial clear

---
 Pixel3XL/SimpleFbDxe/SimpleFbDxe.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/Pixel3XL/SimpleFbDxe/SimpleFbDxe.c b/Pixel3XL/SimpleFbDxe/SimpleFbDxe.c
index 95ae25d..7e55d4e 100644
--- a/Pixel3XL/SimpleFbDxe/SimpleFbDxe.c
+++ b/Pixel3XL/SimpleFbDxe/SimpleFbDxe.c
@@ -172,6 +172,7 @@ DisplayBlt
     IN  UINTN                             Delta         OPTIONAL
 )
 {
+
   RETURN_STATUS                         Status;
   EFI_TPL                               Tpl;
   //
@@ -296,6 +297,8 @@ SimpleFbDxeInitialize
     // zhuowei: clear the screen to black
     // UEFI standard requires this, since text is white - see OvmfPkg/QemuVideoDxe/Gop.c
     ZeroMem((void*)FrameBufferAddress, FrameBufferSize);
+    // hack: clear cache
+    WriteBackInvalidateDataCacheRange((void*)FrameBufferAddress, FrameBufferSize);
     // zhuowei: end
  
     /* Register handle */