SYSTEM_THREAD_EXCEPTION_NOT_HANDLED on ClSomImx7

[jordanrh1]

Some time after the first boot, Compulab IMX7 enters a reboot loop where it bugchecks just after the Windows logo appears. The bugcheck is SYSTEM_THREAD_EXCEPTION_NOT_HANDLED. It occurs after bootmgr and before the debugger attaches for NT kernel, which probably means it's happening in winload. I have been unable to attach the boot debugger to winload, so unable to gather more information. Will likely need JTAG to debug.

[jordanrh1]

It was booting into UpdateOS, and UpdateOS was crashing. Enabled kernel debugging of UpdateOS with:

bcdedit /store k:\efi\Microsoft\boot\bcd /debug {311b88b5-9b30-491d-bad9-167ca3e2d417} on

You can enumerate all boot entries with:

bcdedit /store k:\efi\Microsoft\boot\bcd /enum all

The bugcheck is:

	BugCheck 7E, {c0000709, 8c05a068, 8cc03880, 8cc03680}
	
	Probably caused by : mx6pep.sys ( mx6pep!MX6_PEP::InitializeResources+12c )

mx6pep should not be loaded on IMX7!

[jordanrh1]

It also looks like HalExtiMX7Timers is not present, which later causes a bugcheck when it tries to go into low power mode.

[jordanrh1]

@hbeberman @neilsh-msft It looks like the wrong UpdateOS is getting picked up for IMX7. An IMX6 UpdateOS is being included in IMX7 images. Can one of you take a look?

[hbeberman]

Issue should be resolved by pull #33. The board specific cabs changed directories and the override to grab the correct UpdateOS cab was looking in the wrong location.
i.MX7 FFUs now contain the correct UpdateOS drivers.