Serial port used by the DEBUG macro is initialised in StandaloneMmMain by the DebugLib constructor.
When we use a serial port initialised by TF-A it is not a problem. However, if we use a serial port that is not initialised by TF-A, the debug log prints hangs. Therefore, initialise the serial port early on in the entry point. Signed-off-by: levi.yun <yeoreum....@arm.com> --- These changes can be seen at https://github.com/LeviYeoReum/edk2/tree/levi/2956_init_serial too. StandaloneMmPkg/StandaloneMmPkg.dsc | 1 + StandaloneMmPkg/Library/StandaloneMmCoreEntryPoint/StandaloneMmCoreEntryPoint.inf | 1 + StandaloneMmPkg/Library/StandaloneMmCoreEntryPoint/Arm/StandaloneMmCoreEntryPoint.c | 3 +++ 3 files changed, 5 insertions(+) diff --git a/StandaloneMmPkg/StandaloneMmPkg.dsc b/StandaloneMmPkg/StandaloneMmPkg.dsc index 8012f93b7dcc38ea8fdd2de98912bbc09157ec53..040a4aa5b3d268fdfaaec9a975cfc6ff31aa37b4 100644 --- a/StandaloneMmPkg/StandaloneMmPkg.dsc +++ b/StandaloneMmPkg/StandaloneMmPkg.dsc @@ -66,6 +66,7 @@ [LibraryClasses.AARCH64, LibraryClasses.ARM] ArmSvcLib|ArmPkg/Library/ArmSvcLib/ArmSvcLib.inf CacheMaintenanceLib|ArmPkg/Library/ArmCacheMaintenanceLib/ArmCacheMaintenanceLib.inf PeCoffExtraActionLib|StandaloneMmPkg/Library/StandaloneMmPeCoffExtraActionLib/StandaloneMmPeCoffExtraActionLib.inf + SerialPortLib|MdePkg/Library/BaseSerialPortLibNull/BaseSerialPortLibNull.inf NULL|ArmPkg/Library/CompilerIntrinsicsLib/CompilerIntrinsicsLib.inf NULL|MdePkg/Library/BaseStackCheckLib/BaseStackCheckLib.inf diff --git a/StandaloneMmPkg/Library/StandaloneMmCoreEntryPoint/StandaloneMmCoreEntryPoint.inf b/StandaloneMmPkg/Library/StandaloneMmCoreEntryPoint/StandaloneMmCoreEntryPoint.inf index 75cfb98c0e75cd7cee2a59723035679612da4528..086639ecfbc983627aed73817815e2485104375e 100644 --- a/StandaloneMmPkg/Library/StandaloneMmCoreEntryPoint/StandaloneMmCoreEntryPoint.inf +++ b/StandaloneMmPkg/Library/StandaloneMmCoreEntryPoint/StandaloneMmCoreEntryPoint.inf @@ -42,6 +42,7 @@ [LibraryClasses] DebugLib [LibraryClasses.ARM, LibraryClasses.AARCH64] + SerialPortLib StandaloneMmMmuLib ArmSvcLib diff --git a/StandaloneMmPkg/Library/StandaloneMmCoreEntryPoint/Arm/StandaloneMmCoreEntryPoint.c b/StandaloneMmPkg/Library/StandaloneMmCoreEntryPoint/Arm/StandaloneMmCoreEntryPoint.c index 96de10405af829c66e3f43ed4692f785d8df113e..66b56bdfe4959d5ab6152ff024caa6e900e7a948 100644 --- a/StandaloneMmPkg/Library/StandaloneMmCoreEntryPoint/Arm/StandaloneMmCoreEntryPoint.c +++ b/StandaloneMmPkg/Library/StandaloneMmCoreEntryPoint/Arm/StandaloneMmCoreEntryPoint.c @@ -335,6 +335,9 @@ _ModuleEntryPoint ( UINTN TeDataSize; EFI_PHYSICAL_ADDRESS ImageBase; + // Initialize the Serial Port early to print debug log before StandaloneMmMain. + SerialPortInitialize (); + // Get Secure Partition Manager Version Information Status = GetSpmVersion (); if (EFI_ERROR (Status)) { -- Guid("CE165669-3EF3-493F-B85D-6190EE5B9759") IMPORTANT NOTICE: The contents of this email and any attachments are confidential and may also be privileged. If you are not the intended recipient, please notify the sender immediately and do not disclose the contents to any other person, use it for any purpose, or store or copy the information in any medium. Thank you. -=-=-=-=-=-=-=-=-=-=-=- Groups.io Links: You receive all messages sent to this group. View/Reply Online (#113276): https://edk2.groups.io/g/devel/message/113276 Mute This Topic: https://groups.io/mt/103540969/21656 Group Owner: devel+ow...@edk2.groups.io Unsubscribe: https://edk2.groups.io/g/devel/unsub [arch...@mail-archive.com] -=-=-=-=-=-=-=-=-=-=-=-
