[Bug 255366] Only a single cpu detected on RP3

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=255366

            Bug ID: 255366
           Summary: Only a single cpu detected on RP3
           Product: Base System
           Version: 13.0-RELEASE
          Hardware: arm64
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: bugs at FreeBSD.org
          Reporter: chris at crvintel.com

I have just upgraded to FreeBSD 13.0-RELEASE from 12.2 for my Raspberry PI 3+.
On booting the kernel detects only a single CPU:

dmesg output:

VT(efifb): resolution 656x416
real memory  = 993951744 (947 MB)
avail memory = 947949568 (904 MB)
Starting CPU 1 (1)
Starting CPU 1 (2)
Starting CPU 1 (3)
FreeBSD/SMP: Multiprocessor System Detected: 1 CPUs

and:

[tmp]# sysctl dev.cpu
dev.cpu.3.%parent: cpulist0
dev.cpu.3.%pnpinfo: name=cpu at 3 compat=arm,cortex-a53
dev.cpu.3.%location: 
dev.cpu.3.%driver: cpu
dev.cpu.3.%desc: Open Firmware CPU
dev.cpu.2.%parent: cpulist0
dev.cpu.2.%pnpinfo: name=cpu at 2 compat=arm,cortex-a53
dev.cpu.2.%location: 
dev.cpu.2.%driver: cpu
dev.cpu.2.%desc: Open Firmware CPU
dev.cpu.1.%parent: cpulist0
dev.cpu.1.%pnpinfo: name=cpu at 1 compat=arm,cortex-a53
dev.cpu.1.%location: 
dev.cpu.1.%driver: cpu
dev.cpu.1.%desc: Open Firmware CPU
dev.cpu.0.temperature: 36.4C
dev.cpu.0.freq_levels: 1400/-1 600/-1
dev.cpu.0.freq: 600
dev.cpu.0.%parent: cpulist0
dev.cpu.0.%pnpinfo: name=cpu at 0 compat=arm,cortex-a53
dev.cpu.0.%location: 
dev.cpu.0.%driver: cpu
dev.cpu.0.%desc: Open Firmware CPU
dev.cpu.%parent

Can't find any similar bugs, and I think my kernel config is OK, and have
checked the release notes. What have I missed,or is this a bug?

Thanks

Chris

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