[Bug 270044] Raspberry Pi 4B does not reboot after addition of ram0 driver

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=270044

            Bug ID: 270044
           Summary: Raspberry Pi 4B does not reboot after addition of ram0
                    driver
           Product: Base System
           Version: CURRENT
          Hardware: arm64
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: arm
          Assignee: freebsd-arm@FreeBSD.org
          Reporter: karels@freebsd.org

Since the addition of the ram0 driver in e6cf1a0826c9, the Raspberry Pi 4B does
not reboot.  It hangs after printing the Uptime, and before printing "Resetting
system ..."  Placing hints.ram.0.disabled="1" in /boot/device.hints works
around the problem, but this should not be necessary.

There was some discussion of this issue on freebsd-arm.  Mark Millard pointed
out that the memory map looked strange with the ram0 driver enabled.  See
https://lists.freebsd.org/archives/freebsd-arm/2023-February/002331.html.

I can assist with debugging / running tests.

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