ArmVirtPkg's Platform BDS has never had a progress bar. We can easily add
one, by copying the PlatformBootManagerWaitCallback() function verbatim
from

  Nt32Pkg/Library/PlatformBootManagerLib/PlatformBootManager.c

It can be tested by passing the following option to QEMU (5 seconds):

  -boot menu=on,splash-time=5000

Cc: Ard Biesheuvel <[email protected]>
Cc: Leif Lindholm <[email protected]>
Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Laszlo Ersek <[email protected]>
---

Notes:
    v2:
    - rebase to recent Nt32Pkg commit ef3216ebf350 [Jordan]

 ArmVirtPkg/Library/PlatformBootManagerLib/PlatformBm.c | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

diff --git a/ArmVirtPkg/Library/PlatformBootManagerLib/PlatformBm.c 
b/ArmVirtPkg/Library/PlatformBootManagerLib/PlatformBm.c
index b7e02f3d00f4..198d0602b3c0 100644
--- a/ArmVirtPkg/Library/PlatformBootManagerLib/PlatformBm.c
+++ b/ArmVirtPkg/Library/PlatformBootManagerLib/PlatformBm.c
@@ -573,4 +573,21 @@ PlatformBootManagerWaitCallback (
   UINT16          TimeoutRemain
   )
 {
+  EFI_GRAPHICS_OUTPUT_BLT_PIXEL_UNION Black;
+  EFI_GRAPHICS_OUTPUT_BLT_PIXEL_UNION White;
+  UINT16                              Timeout;
+
+  Timeout = PcdGet16 (PcdPlatformBootTimeOut);
+
+  Black.Raw = 0x00000000;
+  White.Raw = 0x00FFFFFF;
+
+  BootLogoUpdateProgress (
+    White.Pixel,
+    Black.Pixel,
+    L"Start boot option",
+    White.Pixel,
+    (Timeout - TimeoutRemain) * 100 / Timeout,
+    0
+    );
 }
-- 
1.8.3.1

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