[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: [email protected]
          Reporter: [email protected]

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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