The branch stable/12 has been updated by mjg:

URL: 
https://cgit.FreeBSD.org/src/commit/?id=4bce44bdac3e821630032ef13e80562c7919a66a

commit 4bce44bdac3e821630032ef13e80562c7919a66a
Author:     Mateusz Guzik <[email protected]>
AuthorDate: 2021-07-21 12:06:34 +0000
Commit:     Mateusz Guzik <[email protected]>
CommitDate: 2021-07-21 12:06:34 +0000

    arm: hide pc_mpidr behind #if __ARM_ARCH >= 6
    
    This is a direct commit.
    
    Unbreaks the build of:
    DB-78XXX
    DB-88F5XXX
    DB-88F6XXX
    RT1310
    LINT-V5
    TS7800
    
    Sponsored by:   Rubicon Communications, LLC ("Netgate")
---
 sys/arm/arm/machdep.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/sys/arm/arm/machdep.c b/sys/arm/arm/machdep.c
index a1354f303b3a..7aa19ceb3275 100644
--- a/sys/arm/arm/machdep.c
+++ b/sys/arm/arm/machdep.c
@@ -378,7 +378,9 @@ void
 cpu_pcpu_init(struct pcpu *pcpu, int cpuid, size_t size)
 {
 
+#if __ARM_ARCH >= 6
        pcpu->pc_mpidr = 0xffffffff;
+#endif
 }
 
 void
@@ -765,7 +767,9 @@ pcpu0_init(void)
        set_curthread(&thread0);
 #endif
        pcpu_init(pcpup, 0, sizeof(struct pcpu));
+#if __ARM_ARCH >= 6
        pcpup->pc_mpidr = cp15_mpidr_get() & 0xFFFFFF;
+#endif
        PCPU_SET(curthread, &thread0);
 }
 
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