Hi Arne,
This is the forum post that I mentioned at the last conf call about the person asking about mitigations for the Spectre 2 and 4 vulnerabilities he is seeing on his arm cortex A72 system.
The poster indicated that the manufacturer had patches to mitigate these two spectre variants.
https://community.ipfire.org/t/arm-cortex-a72-spectre-vulnerable/8842
Regards, Adolf.