[Bug 234778] Only 1 CPU core out of 4 is usable on RPi2 v1.2

[bugzilla-noreply at freebsd.org]

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=234778

            Bug ID: 234778
           Summary: Only 1 CPU core out of 4 is usable on RPi2 v1.2
           Product: Base System
           Version: 12.0-STABLE
          Hardware: arm
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: arm
          Assignee: freebsd-arm at FreeBSD.org
          Reporter: t_uemura at macome.co.jp

The architecture of recent 12-STABLE for RPi2 (32 bit) is armv7, rather than
armv6 on 11-STABLE. This means that there is a chance that the same build can
run also on RPi2 v1.2 equipped with the newer ARMv8 based BCM2837 SoC.

Actually, the build works almost perfectly on v1.2 board except one big issue,
that only 1 CPU logical core is used/assigned to all processes and the
remaining 3 cores are completely ignored, despite all 4 cores are listed in
top, for example.

This doesn't happen on v1.1 board. The same microSD (just pulled out from v1.2
board) runs fine on v1.1 board. I can't see any significant differences between
both boards in top, dmesg or sysctl output.

The OS is r341492, rpi-firmware is 1.20180619 or the GIT rev. 077fbe8 (as of
6th Dec. 2018) and u-boot is 2018.11.

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