ArmPkg Sct

Debugging UEFI Self Certification Test (SCT)

1. Build UEFI for your targeted ARM RTSM (RealTime System Model). See ArmPlatformPkg-ArmVExpressPkg for more complete instructions.

For this tutorial we will use ARM Versatile Express Cortex A9x4 RTSM:

cd $EDK2_ROOT
. edksetup.sh `pwd`/BaseTools
build -a ARM -p ArmPlatformPkg/ArmVExpressPkg/ArmVExpress-RTSM-A9x4.dsc -t ARMLINUXGCC

2. Build SCT binaries. Rebuilding the binaries will ensure the SCT package matches your SCT sources code that will ease the debugging. See the README attached to your SCT source package for the correct build instructions.

Example with the latest SCT source package (UEFI 2.3.1 SCT October 2012):

export PATH=/opt/DS-5/bin:$PATH
SctPkg/BuildArmSct.sh RVCT

Note: The first line is to add the ARM compiler (RVCT toolchain) to your PATH. The location of your RVCT toolchain might be different.

3. Create a MMC card with your newly built version of SCT and the EDK Shell binary (required to start SCT)

cp $EDK2_ROOT/EdkShellBinPkg/FullShell/Arm/Shell_Full.efi /tmp/fs/
cp -Rf $EDK2_ROOT/Build/UefiSct/DEBUG_RVCTLINUX/SctPackageARM/* /tmp/fs/

sudo umount /tmp/fs

4. Start the RTSM model with the MMC card that contains the SCT binaries.

Example to start ARM Versatile Express Cortex A9x4 RTSM: RTSM_VE_Cortex-A9_MPx4 -C motherboard.flashloader0.fname=$EDK2_ROOT/Build/ArmVExpress-RTSM-A9x4/DEBUG_ARMLINUXGCC/FV/RTSM_VE_CORTEX-A9_EFI.fd -C motherboard.mmc.p_mmc_file="/tmp/mmc.dat" -C motherboard.flashloader1.fname="flash.dat" -C motherboard.flashloader1.fnameWrite="flash.dat"

Note: The arguments '-C motherboard.flashloader1.fname="flash.dat" -C motherboard.flashloader1.fnameWrite="flash.dat"' allow to save the non-volatile UEFI environment variables (used by the UEFI Boot Manager) within a file of your host machine.

5. To install SCT, you must start EDK Shell. EDK Shell can be started by EFI Shell, but we will choose to add the EDK Shell as the first boot entry to allow SCT when restarted to resume its test execution.
Select the "Boot Manager" entry and "Add Boot Device Entry" to create a new entry for the EDK Shell

[1] SemiHosting
        - VenHw(C5B9C74A-6D72-4719-99AB-C59F199091EB)/zImage
        - Arguments:
        - LoaderType: 1
[2] Shell
[3] Boot Manager
Start: Invalid input (max 3)
Start: 3
[1] Add Boot Device Entry
[2] Update Boot Device Entry
[3] Remove Boot Device Entry
[4] Update FDT path
[5] Return to main menu
Choice: 1
[1] SemihostFs (0 MB)
        - VenHw(C5B9C74A-6D72-4719-99AB-C59F199091EB)
[2] MMC_SD_CARD (127 MB)
        - VenHw(09831032-6FA3-4484-AF4F-0A000A8D3A82)
[3] VenHw(E7223039-5836-41E1-B542-D7EC736C5E59)
        - VenHw(E7223039-5836-41E1-B542-D7EC736C5E59)
[4] VenHw(02118005-9DA7-443A-92D5-781F022AEDBB)
        - VenHw(02118005-9DA7-443A-92D5-781F022AEDBB)
[5] VenHw(1F15DA3C-37FF-4070-B471-BB4AF12A724A)
        - VenHw(1F15DA3C-37FF-4070-B471-BB4AF12A724A)
[6] VenHw(CC2CBF29-1498-4CDD-8171-F8B6B41D0909)
        - VenHw(CC2CBF29-1498-4CDD-8171-F8B6B41D0909)
[7] VenHw(09831032-6FA3-4484-AF4F-0A000A8D3A82)
        - VenHw(09831032-6FA3-4484-AF4F-0A000A8D3A82)
Select the Boot Device: 2
File path of the EFI Application or the kernel: Shell_Full.efi
Is your application is an OS loader? [y/n] n
Description for this new Entry: EDK Shell

Delete the first entry to make the EDK Shell the first one:

[1] Add Boot Device Entry
[2] Update Boot Device Entry
[3] Remove Boot Device Entry
[4] Update FDT path
[5] Return to main menu
Choice: 3
[1] SemiHosting
        - VenHw(C5B9C74A-6D72-4719-99AB-C59F199091EB)/zImage
        - Arguments:
[2] EDK Shell
        - VenHw(09831032-6FA3-4484-AF4F-0A000A8D3A82)/Shell_Full.efi
Delete entry: 1
[1] Add Boot Device Entry
[2] Update Boot Device Entry
[3] Remove Boot Device Entry
[4] Update FDT path
[5] Return to main menu
Choice: 5
[1] EDK Shell
        - VenHw(09831032-6FA3-4484-AF4F-0A000A8D3A82)/Shell_Full.efi
        - LoaderType: 0
[2] Shell
[3] Boot Manager
Start:

6. Start EDK Shell to install SCT

EFI Shell version 2.31 [0.0]
Current running mode 1.1.2
Device mapping table
  fs0   :BlockDevice - Alias f5 blk0
         VenHw(09831032-6FA3-4484-AF4F-0A000A8D3A82)
  fsnt0 :BlockDevice - Alias f8
         VenHw(C5B9C74A-6D72-4719-99AB-C59F199091EB)
  blk0  :BlockDevice - Alias f5 fs0
         VenHw(09831032-6FA3-4484-AF4F-0A000A8D3A82)
  blk1  :BlockDevice - Alias (null)
         VenHw(02118005-9DA7-443A-92D5-781F022AEDBB)
  blk2  :BlockDevice - Alias (null)
         VenHw(CC2CBF29-1498-4CDD-8171-F8B6B41D0909)
  blk3  :BlockDevice - Alias (null)
         VenHw(E7223039-5836-41E1-B542-D7EC736C5E59)
  blk4  :BlockDevice - Alias (null)
         VenHw(1F15DA3C-37FF-4070-B471-BB4AF12A724A)

Press ESC in 5 seconds to skip startup.nsh, any other key to continue.
Shell> fs0:

fs0:\> dir
Directory of: fs0:\

  01/02/13  07:50p <DIR>          2,048  ARM
  01/02/13  07:50p               15,904  InstallSctArm.efi
  01/02/13  07:50p                3,762  SctStartup.nsh
  01/02/13  07:50p              661,792  Shell_Full.efi
          3 File(s)     681,458 bytes
          1 Dir(s)


fs0:\> InstallSctArm.efi
add-symbol-file /home/olimar01/tianocore/Build/UefiSct/DEBUG_RVCTLINUX/ARM/SctPkg/Application/InstallSct/InstallSct/DEBUG/InstallSct.dll 0xBF5F7240
Loading driver at 0x000BF5F7000 EntryPoint=0x000BF5F8A45 InstallSct.efi

Gather system information ...
  1: FS0: (Free Space: 123 MB)
  2: fsnt0: (Free Space: 0 MB)
  Space Required: 100 MB
Input index of destination FS. 'q' to exit:1

Backup the existing tests ...

7. Start SCT in interactive mode

fs0:\> cd SCT
fs0:\SCT> SCT -u

center Select the tests you want to run center

... and finally press 'F9' to start the tests.
Once the tests have completed, SCT should return to its UI. center

Press 'ESC' to return to the main menu and select 'Test Report Generator ...' and save the report. By default, the report is located in the directory SCT\Report\ of the filesystem where you installed SCT. center

8. To retrieve the result, you will need to mount your virtual MMC card:

sudo mount -o rw,loop=/dev/loop0,uid=`whoami`,gid=`whoami` /tmp/mmc.dat /tmp/fs
cp /tmp/fs/SCT/Report/ComplianceTests.csv ~/

9. Open the results with your favorite spreadsheet editor and identify the failed tests

In our case we have one failed test: center

Service\Protocol Name	GenericTest\EFICompliantTest
Index	5.22.1.1.8
Instance	0
Iteration	0
Guid	F6334F9B-B930-4ADB-A53B-76FA7B4C2762
Result	FAIL
Title	UEFI-Compliant-Globally Defined Variable check
Runtime Information	/home/olimar01/tianocore/SctPkg/TestCase/UEFI/EFI/Generic/EfiCompliant/BlackBoxTest/EfiCompliantBBTestRequired_uefi.c:1322, Illegal Variable : PL031_TimeZone
Case Revision	0x00010001
Case GUID	117C9ABC-489D-4504-ACDB-12AACE8F505B
Device Path	No device path
Logfile Name	RequiredElements_0_0_117C9ABC-489D-4504-ACDB-12AACE8F505B.log

Generally the most important information is the 'Runtime Information'; in this case: /home/olimar01/tianocore/SctPkg/TestCase/UEFI/EFI/Generic/EfiCompliant/BlackBoxTest/EfiCompliantBBTestRequired_uefi.c:1322. This information will tell you where the error has been raised in the SCT test code.

If we open the SCT source file at this location, we will find the following code in the function CheckGloballyDefinedVariables():

    if (AssertionType == EFI_TEST_ASSERTION_FAILED) {
      StandardLib->RecordAssertion (
                     StandardLib,
                     AssertionType,
                     gEfiCompliantBbTestRequiredAssertionGuid009,
                     L"UEFI Compliant - Globally Defined Variables",
                     L"%a:%d, Illegal Variable : %s",
                     __FILE__,
                     (UINTN)__LINE__,
                     VariableName
                     );
      break;
    }

Additional information might be found in the Log file defined within the 'Logfile Name' column:

$ cat /tmp/fs/SCT/Log/GenericTest/EFICompliantTest/RequiredElements_0_0_117C9ABC-489D-4504-ACDB-12AACE8F505B.log

(...)
/home/olimar01/tianocore/SctPkg/TestCase/UEFI/EFI/Generic/EfiCompliant/BlackBoxTest/EfiCompliantBBTestRequired_uefi.c:901:Status - Success, Expected - Success

  GetDevicePathSize         : 00000000B6E2F054
  DuplicateDevicePath       : 00000000BF6DB521
  AppendDevicePath          : 00000000BF6DB535
  AppendDeviceNode          : 00000000BF6DB549

VariableName: PL031_TimeZone  is not defined in the Spec

UEFI Compliant - Globally Defined Variables -- FAILURE
F6334F9B-B930-4ADB-A53B-76FA7B4C2762
/home/olimar01/tianocore/SctPkg/TestCase/UEFI/EFI/Generic/EfiCompliant/BlackBoxTest/EfiCompliantBBTestRequired_uefi.c:1322, Illegal Variable : PL031_TimeZone


Returned Status Code: Success

RequiredElements: [FAILED]
  Passes........... 7
  Warnings......... 0
  Errors........... 1
------------------------------------------------------------
UEFI 2.3.1
Revision 0x00000018
Test Entry Point GUID: 117C9ABC-489D-4504-ACDB-12AACE8F505B
------------------------------------------------------------
Logfile: "\SCT\Log\GenericTest\EFICompliantTest\RequiredElements_0_0_117C9ABC-489D-4504-ACDB-12AACE8F505B.log"
Test Finished: 01/01/1970  00:08
Elapsed Time: 00 Days 00:00:12

------------------------------------------------------------

10. The first step before debugging the failed test is to understand the test itself and why it fails.

Our test walks through the entire variable list. It looks like one of our driver defines the Globally Defined variable 'PL031_TimeZone'.

There are at least two ways to debug a failed SCT test either by doing a code review of our UEFI firmware to try to fix it or the most complicated way is to use a debugger to step through the test. For this tutorial, we will choose the second option.

The difficulty of debugging UEFI is to load the symbols of dynamically loaded EFI drivers and applications. We do not know in advance where the UEFI binaries will be loaded. One way to do is to start the test a first time to get the addresses where the binaries have been loaded and then start again the test hoping the binaries will be loaded at the same location ...

A more efficient way is to start SCT in interactive mode (command: `SCT -u`) and load all the symbols of the active UEFI binaries with your favorite debugger.
When SCT is started in interactive mode all the SCT test binaries are (pre-)loaded in memory (to retrieve test information for the menu) before the tests are started from the UI.

For this tutorial we will use DS-5 and its UEFI debugging scripts (see ArmPkg-Ds5).

For the Fast Model Versatile Express A9x4, after breaking the execution of the model, type within the DS-5 'Commands' window (with $EDK2_ROOT the root of your EDK2 sources):

source $EDK2_ROOT/ArmPlatformPkg/Scripts/Ds5/cmd_load_symbols.py -m (0x80000000,0x40000000) -a

And add a breakpoint in CheckGloballyDefinedVariables().

center

Resume the execution of the Fast Model and start the SCT test to debug from the SCT User Interface (by pressing F9). As soon as the function where you have set the breakpoint is hit, DS-5 stops the execution.

You can now step though the SCT & UEFI Firmware code :-) center

Category:ARM