BBB boot failure between r366365 and r366386

Sometime after r366365 and up to r366365 BBB stopped booting in the HW
test environment.

Last successful build:
https://ci.freebsd.org/hwlab/job/FreeBSD-device-head-beaglebone-test/6663/
First failing build:
https://ci.freebsd.org/hwlab/job/FreeBSD-device-head-beaglebone-test/6664/

The kernel starts up but ends up in U-Boot again:

...
ARM Debug Architecture not supported
KDB: debugger backends: ddb
KDB: current backend: ddb
Copyright (c) 1992-2020 The FreeBSD Project.
Copyright (c) 1979, 1980, 1983, 1986, 1988, 1989, 1991, 1992, 1993, 1994
The Regents of the University of California. All rights reserved.
FreeBSD is a registered trademark of The FreeBSD Foundation.
FreeBSD 13.0-CURRENT #288 r366440: Mon Oct  5 13:23:01 UTC 2020
    root@FreeBSD-head-armv7-build_devtest.jail:/usr/obj/usr/src/arm.armv7/sys/GENERIC
arm
FreeBSD clang version 11.0.0 ([email protected]:llvm/llvm-project.git
llvmorg-11.0.0-rc5-0-g60a25202a7d)
WARNING: WITNESS option enabled, expect reduced performance.
VT: init without driver.
No PSCI/SMCCC call function found
CPU: ARM Cortex-A8 r3p2 (ECO: 0x00000000)
CPU Features:
  Thumb2, Security, VMSAv7
Optional instructions:
  UMULL, SMULL, SIMD(ext)
LoUU:2 LoC:3 LoUIS:1
Cache level 1:
 32KB/64B 4-way data cache WT WB Read-Alloc
 32KB/64B 4-way instruction cache Read-Alloc
Cache level 2:
 256KB/64B 8-way unified cache WT WB Read-Alloc Write-Alloc
real memory  = 536055808 (511 MB)
avail memory = 506232832 (482 MB)
Texas Instruments AM335x Processor, Revision ES2.1
random: unblocking device.

U-Boot SPL 2020.07 (Sep 24 2020 - 04:58:48 +0000)
Trying to boot from MMC2


U-Boot 2020.07 (Sep 24 2020 - 04:58:48 +0000)

CPU  : AM335X-GP rev 2.1
Model: TI AM335x BeagleBone Black
DRAM:  512 MiB
...
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