[PATCH v2 2/5] ArmPkg/PlatformBootManagerLib: fall back to the UiApp on boot failure

["Ard Biesheuvel" <ard.biesheuvel@arm.com>]

As a last resort, drop into the UiApp application when no active boot
options could be started. Doing so will connect all devices, and so
it will allow the user to enter the Boot Manager submenu and pick a
network or removable disk option.

Note that this only occurs if even the default removable filepath
could not be booted (e.g., \EFI\BOOT\BOOTAA64.EFI on AArch64)

Signed-off-by: Ard Biesheuvel <ard.biesheuvel@arm.com>
Reviewed-by: Laszlo Ersek <lersek@redhat.com>
---
 ArmPkg/Library/PlatformBootManagerLib/PlatformBm.c | 12 +++++++++++-
 1 file changed, 11 insertions(+), 1 deletion(-)

diff --git a/ArmPkg/Library/PlatformBootManagerLib/PlatformBm.c b/ArmPkg/Library/PlatformBootManagerLib/PlatformBm.c
index 23c925bbdb9c..85cb32f6d7cd 100644
--- a/ArmPkg/Library/PlatformBootManagerLib/PlatformBm.c
+++ b/ArmPkg/Library/PlatformBootManagerLib/PlatformBm.c
@@ -830,5 +830,15 @@ PlatformBootManagerUnableToBoot (
   VOID
   )
 {
-  return;
+  EFI_STATUS                   Status;
+  EFI_BOOT_MANAGER_LOAD_OPTION BootManagerMenu;
+
+  Status = EfiBootManagerGetBootManagerMenu (&BootManagerMenu);
+  if (EFI_ERROR (Status)) {
+    return;
+  }
+
+  for (;;) {
+    EfiBootManagerBoot (&BootManagerMenu);
+  }
 }
-- 
2.17.1