Re: [edk2-platform PATCH v1 1/1] Platform/RaspberryPi: Make SetVariable return EFI_UNSUPPORTED at runtime

Sunny Wang

Please ignore this patch. Making gRT->SetVariable at runtime return EFI_UNSUPPORTED would cause some OSes' installation failure/error.
I thought the latest OS may support UNSUPPORTED case, but it turned out still an error/failure. I checked both Ubuntu 21.04 and OpenSUSE 15.3 Leap, and both of them could not be smoothly installed.
I will take a further look into this and figure out a better solution.

Hi Ard,
Yeah, I'm also working on EFI_RT_PROPERTIES_TABLE, but ran into some problems. I'm still debugging it. Hope using EFI_RT_PROPERTIES_TABLE won't cause OS installation failure.

Best Regards,
Sunny Wang

-----Original Message-----
From: Ard Biesheuvel <>
Sent: Friday, July 23, 2021 11:10 PM
To: Sunny Wang <>
Cc: edk2-devel-groups-io <>; Samer El-Haj-Mahmoud <>; Sami Mujawar <>; Jeremy Linton <>; Ard Biesheuvel <>; Pete Batard <>; Leif Lindholm <>
Subject: Re: [edk2-platform PATCH v1 1/1] Platform/RaspberryPi: Make SetVariable return EFI_UNSUPPORTED at runtime

On Fri, 23 Jul 2021 at 11:15, Sunny Wang <> wrote:

The RPi does not support storing UEFI NV variables at runtime. For now,
gRT->SetVariable at runtime returns EFI_OUT_OF_RESOURCES which is not a
proper error and would cause FWTS failures. Therefore, this patch is
to make gRT->SetVariable at runtime return EFI_UNSUPPORTED.

For more information, please check the issues below:

I also tested this with the ACS 3.0 FWTS. All the failures
reported in issue 93 and 163 can be fixed by this patch.

Cc: Samer El-Haj-Mahmoud <>
Cc: Sami Mujawar <>
Cc: Jeremy Linton <>
Cc: Ard Biesheuvel <>
Cc: Pete Batard <>
Cc: Leif Lindholm <>

Signed-off-by: Sunny Wang <>
This looks ok to me, but we should also expose this fact via the
EFI_RT_PROPERTIES_TABLE, so that the OS can anticipate this result.

.../Drivers/VarBlockServiceDxe/VarBlockService.c | 12 ++++++++++++
1 file changed, 12 insertions(+)

diff --git a/Platform/RaspberryPi/Drivers/VarBlockServiceDxe/VarBlockService.c b/Platform/RaspberryPi/Drivers/VarBlockServiceDxe/VarBlockService.c
index 572309439a..16d4d4f178 100644
--- a/Platform/RaspberryPi/Drivers/VarBlockServiceDxe/VarBlockService.c
+++ b/Platform/RaspberryPi/Drivers/VarBlockServiceDxe/VarBlockService.c
@@ -2,6 +2,7 @@
* Copyright (c) 2018, Andrei Warkentin <>
* Copyright (c) 2006-2014, Intel Corporation. All rights reserved.
+ * Copyright (c) 2021, ARM Limited. All rights reserved.
* SPDX-License-Identifier: BSD-2-Clause-Patent
@@ -596,6 +597,7 @@ FvbProtocolWrite (
EFI_DEVICE_ERROR - The block device is not functioning correctly and
could not be written
+ EFI_UNSUPPORTED This function is not supported at runtime

@@ -605,6 +607,16 @@ FvbProtocolWrite (
EFI_STATUS ReturnStatus;

+ //
+ // The current variables support relies on modifying RPI_EFI.FD on SD
+ // card, which works fine at boot time. However, at runtime, the SD
+ // controller is exposed via ACPI and subsequently owned by the OS.
+ // Therefore, we need to direclty return EFI_UNSUPPORTED.
+ //
+ if (EfiAtRuntime ()) {
+ }
// Check for invalid conditions.
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