Apple, Nvidia, Qualcomm, Marvell, and Cavium all make custom ARM cores and none of them have any info on whether their cores are affected by Spectre/Meltdown and available mitigations. Don't forget about non-Cortex cores!
That is about OS-level mitigations. It says exactly nothing about specific CPU microarchitectures and how they're affected. I bet Apple's cores are affected by the misprediction issue, and you can't patch that one at the OS level.
