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EmbeddedPkg/VirtualRealTimeClockLib: Fix SetTime issues 

This patch fixes two issues below:
1. SCT SetTime_Func failures.
   - https://github.com/pftf/RPi4/issues/164
2. Using shell time and date commands to set time can't work.

The problem is that gRT->SetTime always returns EFI_INVALID_PARAMETER
error status.

The root cause is that LibSetTime() sets RtcEpochSeconds variable with
inconsistent attributes. One is without EFI_VARIABLE_NON_VOLATILE,
the other one is with EFI_VARIABLE_NON_VOLATILE. That caused that the
variable driver returns EFI_INVALID_PARAMETER. Per UEFI spec, if a
preexisting variable is rewritten with different attributes,
SetVariable() shall not modify the variable and shall return
EFI_INVALID_PARAMETER.

Therefore, the solution is to add EFI_VARIABLE_NON_VOLATILE attribute
to the first EfiSetVariable() call to make two calls consistent.

By the way, this patch also fix a minor issue with a debug message.

Signed-off-by: Sunny Wang <sunny.wang@arm.com>
Reviewed-by: Pete Batard <pete@akeo.ie>
Tested-by: Pete Batard <pete@akeo.ie>
This commit is contained in:
Sunny Wang 2021-07-23 17:01:01 +08:00 committed by mergify[bot]
parent 514b3aa08e
commit 8e6bb64fe4
1 changed files with 3 additions and 3 deletions
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6
EmbeddedPkg/Library/VirtualRealTimeClockLib/VirtualRealTimeClockLib.c
View File

@ -4,7 +4,7 @@
*
* Coypright (c) 2019, Pete Batard <pete@akeo.ie>
* Copyright (c) 2018, Andrei Warkentin <andrey.warkentin@gmail.com>
* Copyright (c) 2011-2014, ARM Ltd. All rights reserved.
* Copyright (c) 2011-2021, ARM Ltd. All rights reserved.
* Copyright (c) 2008-2010, Apple Inc. All rights reserved.
* Copyright (c) Microsoft Corporation. All rights reserved.
*
@ -96,7 +96,7 @@ LibGetTime (
EfiSetVariable (
(CHAR16 *)mEpochVariableName,
&gEfiCallerIdGuid,
EFI_VARIABLE_BOOTSERVICE_ACCESS | EFI_VARIABLE_RUNTIME_ACCESS,
EFI_VARIABLE_NON_VOLATILE | EFI_VARIABLE_BOOTSERVICE_ACCESS | EFI_VARIABLE_RUNTIME_ACCESS,
sizeof (EpochSeconds),
&EpochSeconds
);
@ -324,7 +324,7 @@ LibSetTime (
DEBUG ((
DEBUG_ERROR,
"LibSetTime: Failed to save %s variable to non-volatile storage, Status = %r\n",
mDaylightVariableName,
mEpochVariableName,
Status
));
return Status;