[Bug 274956] Kernel panic at mountroot prompt

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=274956

            Bug ID: 274956
           Summary: Kernel panic at mountroot prompt
           Product: Base System
           Version: 15.0-CURRENT
          Hardware: arm64
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: arm
          Assignee: [email protected]
          Reporter: [email protected]

I am attempting to boot FreeBSD on an i.MX 8M Plus EVK from NXP
(https://www.nxp.com/design/development-boards/i-mx-evaluation-and-development-boards/evaluation-kit-for-the-i-mx-8m-plus-applications-processor:8MPLUSLPD4-EVK).
The kernel is loading successfully and boots up to the point where it is trying
to mount the root filesystem, at which point it panics. I have tried local
builds of FreeBSD 13.2, and 14.0-RC2 as well as the 20231026 build of
15-CURRENT all with similar results.

I am attempting to boot a USB installer image with the u-boot install shipped
on the board.

u-boot commands:
run loadfdt
usb start
fatload usb 0:1 ${loadaddr} /EFI/BOOT/bootaa64.efi
bootefi ${loadaddr} ${fdt_addr}

I have attached the initial kernel output along with the panic from the attempt
using the 20231026 build of 15-CURRENT.

Any hints as to what might be going on here are greatly appreciated.

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