Tested on arm, arm64, riscv.
Relevant output from `devinfo -r` on my rockpro64:
```
ram0
I/O memory addresses:
0x200000-0x80fffff
0x8100000-0x8112fff
0x8113000-0xe8dfffff
0xe8e00000-0xea317fff
0xea318000-0xf0f0afff
0xf0f0b000-0xf0f0efff
0xf0f0f000-0xf0f0ffff
0xf0f10000-0xf0f10fff
0xf0f11000-0xf0f12fff
0xf0f13000-0xf0f16fff
0xf0f17000-0xf0f17fff
0xf0f18000-0xf0f1cfff
0xf0f1d000-0xf0f1dfff
0xf0f1e000-0xf0f1efff
0xf0f1f000-0xf0f20fff
0xf0f21000-0xf0f21fff
0xf0f22000-0xf0f22fff
0xf0f23000-0xf0f24fff
0xf0f25000-0xf0f25fff
0xf0f26000-0xf0f26fff
0xf0f27000-0xf3f3ffff
0xf3f40000-0xf3f4ffff
0xf3f50000-0xf5ffffff
0xf6000000-0xf7fa3fff
0xf7fa4000-0xf7ffffff
```
And the matching physmem entries, reported by verbose dmesg:
```
Physical memory chunk(s):
0x00200000 - 0x080fffff, 127 MB ( 32512 pages)
0x08113000 - 0xf0f0afff, 3725 MB ( 953848 pages)
0xf0f0f000 - 0xf0f12fff, 0 MB ( 4 pages)
0xf0f14000 - 0xf0f1bfff, 0 MB ( 8 pages)
0xf0f1d000 - 0xf0f1dfff, 0 MB ( 1 pages)
0xf0f1f000 - 0xf0f20fff, 0 MB ( 2 pages)
0xf0f22000 - 0xf0f22fff, 0 MB ( 1 pages)
0xf0f25000 - 0xf0f25fff, 0 MB ( 1 pages)
0xf0f27000 - 0xf3f3ffff, 48 MB ( 12313 pages)
0xf3f50000 - 0xf5ffffff, 32 MB ( 8368 pages)
0xf7fa4000 - 0xf7ffffff, 0 MB ( 92 pages)
Excluded memory regions:
0x08100000 - 0x08112fff, 0 MB ( 19 pages) NoAlloc
0xe8e00000 - 0xea317fff, 21 MB ( 5400 pages) NoAlloc
0xf0f0b000 - 0xf0f0efff, 0 MB ( 4 pages) NoAlloc
0xf0f10000 - 0xf0f10fff, 0 MB ( 1 pages) NoAlloc
0xf0f13000 - 0xf0f16fff, 0 MB ( 4 pages) NoAlloc
0xf0f18000 - 0xf0f1cfff, 0 MB ( 5 pages) NoAlloc
0xf0f1e000 - 0xf0f1efff, 0 MB ( 1 pages) NoAlloc
0xf0f21000 - 0xf0f21fff, 0 MB ( 1 pages) NoAlloc
0xf0f23000 - 0xf0f24fff, 0 MB ( 2 pages) NoAlloc
0xf0f26000 - 0xf0f26fff, 0 MB ( 1 pages) NoAlloc
0xf3f40000 - 0xf3f4ffff, 0 MB ( 16 pages) NoAlloc
0xf6000000 - 0xf7fa3fff, 31 MB ( 8100 pages) NoAlloc
```