I went ahead and added this file:
https://github.com/raspberrypi/firmware ... b-plus.dtb to /boot/dtbs/broadcom and renamed it to bcm283x-rpi-other.dtb
The pi boots just fine and i'm able to ssh to it after wireless starts.
$this->bbcode_second_pass_code('', 'uname -a
Linux alarm 4.15.15-1-ARCH #1 SMP Sat Mar 31 21:00:14 MDT 2018 aarch64 GNU/Linux
cat cpuinfo
processor : 0
BogoMIPS : 38.40
Features : fp asimd evtstrm crc32 cpuid
CPU implementer : 0x41
CPU architecture: 8
CPU variant : 0x0
CPU part : 0xd03
CPU revision : 4
processor : 1
BogoMIPS : 38.40
Features : fp asimd evtstrm crc32 cpuid
CPU implementer : 0x41
CPU architecture: 8
CPU variant : 0x0
CPU part : 0xd03
CPU revision : 4
processor : 2
BogoMIPS : 38.40
Features : fp asimd evtstrm crc32 cpuid
CPU implementer : 0x41
CPU architecture: 8
CPU variant : 0x0
CPU part : 0xd03
CPU revision : 4
processor : 3
BogoMIPS : 38.40
Features : fp asimd evtstrm crc32 cpuid
CPU implementer : 0x41
CPU architecture: 8
CPU variant : 0x0
CPU part : 0xd03
CPU revision : 4
')