That looks like an issue with using Python 3.9 as it changed tostring to tobyte. 
> On Jun 22, 2022, at 7:25 AM, Shivraj Patil <shivpati@qti.qualcomm.com> wrote:
> 
> 
> Hello,
> I am observing the following failure while trying to build Aurora AU_LINUX_EMBEDDED_LE.PRODUCT.1.0_TARGET_ALL.01.318.215. Please have a look and provide a solution for the same.
>  
> (Python 3.9.4 on linux) Traceback (most recent call last):
> |   File "/local/mnt3/workspace3/shivpati/Aurora/build-qti-distro-xr-debug/tmp-glibc/work/sxrneo-oe-linux/edk2/git-r0/edk2/BaseTools/BinWrappers/PosixLike/../../Source/Python/build/build.py", line 2596, in Main
> |     MyBuild.Launch()
> |   File "/local/mnt3/workspace3/shivpati/Aurora/build-qti-distro-xr-debug/tmp-glibc/work/sxrneo-oe-linux/edk2/git-r0/edk2/BaseTools/BinWrappers/PosixLike/../../Source/Python/build/build.py", line 2391, in Launch
> |     self._MultiThreadBuildPlatform()
> |   File "/local/mnt3/workspace3/shivpati/Aurora/build-qti-distro-xr-debug/tmp-glibc/work/sxrneo-oe-linux/edk2/git-r0/edk2/BaseTools/BinWrappers/PosixLike/../../Source/Python/build/build.py", line 2271, in _MultiThreadBuildPlatform
> |     self.CreateAsBuiltInf()
> |   File "/local/mnt3/workspace3/shivpati/Aurora/build-qti-distro-xr-debug/tmp-glibc/work/sxrneo-oe-linux/edk2/git-r0/edk2/BaseTools/BinWrappers/PosixLike/../../Source/Python/build/build.py", line 2401, in CreateAsBuiltInf
> |     Module.CreateAsBuiltInf()
> |   File "/local/mnt3/workspace3/shivpati/Aurora/build-qti-distro-xr-debug/tmp-glibc/work/sxrneo-oe-linux/edk2/git-r0/edk2/BaseTools/Source/Python/AutoGen/ModuleAutoGen.py", line 1503, in CreateAsBuiltInf
> |     PatchList = parsePcdInfoFromMapFile(
> |   File "/local/mnt3/workspace3/shivpati/Aurora/build-qti-distro-xr-debug/tmp-glibc/work/sxrneo-oe-linux/edk2/git-r0/edk2/BaseTools/Source/Python/GenPatchPcdTable/GenPatchPcdTable.py", line 56, in parsePcdInfoFromMapFile
> |     return _parseForGCC(lines, efifilepath)
> |   File "/local/mnt3/workspace3/shivpati/Aurora/build-qti-distro-xr-debug/tmp-glibc/work/sxrneo-oe-linux/edk2/git-r0/edk2/BaseTools/Source/Python/GenPatchPcdTable/GenPatchPcdTable.py", line 113, in _parseForGCC
> |     efisecs = PeImageClass(efifilepath).SectionHeaderList
> |   File "/local/mnt3/workspace3/shivpati/Aurora/build-qti-distro-xr-debug/tmp-glibc/work/sxrneo-oe-linux/edk2/git-r0/edk2/BaseTools/Source/Python/Common/Misc.py", line 1638, in __init__
> |     if ByteArray.tostring() != b'PE\0\0':
> | AttributeError: 'array.array' object has no attribute 'tostring'
>  
>  
> Thanks & Regards,
> Shivraj Patil
>