BBB boot failure between r366365 and r366386

[Ed Maste]

  On Mon, 5 Oct 2020 at 09:53, Ed Maste <emaste at freebsd.org> wrote:
>
> Sometime after r366365 and up to r366365 BBB stopped booting in the HW
> test environment.

That should of course be after r366365 and up to (and including)
r366386. Commits in this range include:

r366366 flash: Add support for SPI flash s25fl512s
r366367 Simplify the check for non-dumpable VM object types
r366368 Implement sparse core dumps
r366369 Add backlight subsystem
r366371 Add pwm_backlight
r366372 linuxkpi: Add backlight support
r366373 linuxkpi: Add dmi_* function
r366374 fixup modules/crypto: add dependency workaround
r366376 Fix the INVARIANTS build for 32-bit platforms
r366377 uma: Remove newlines from panic messages
r366378 uma: Use LIFO for non-SMR bucket caches
r366379 uma: Use the bucket cache for cross-domain allocations
r366380 vm_pageout: Avoid rounding down the inactive scan target
r366381 pwm_backlight: Restrict module to armv7 and aarch64
r366382 Fix LINT: Add backlight to NOTES
r366384 cxgbe(4): set up the firmware flowc for the tid before send_abort_rpl
r366386 pwm_backlight: Fix 32 bits build