Now the new Raspberry 4 has moved to ARM A72 cores, it's vulnerable to the spectre issues according to ARM.
Processor Variant 1 Variant 2 Variant 3 Variant 3a Variant 4 Cortex-A72 Yes Yes** No** Yes** Yes
But this gives no output:
ls -1A /sys/devices/system/cpu/vulnerabilities cat /sys/devices/system/cpu/vulnerabilities/* '/sys/devices/system/cpu/vulnerabilities/*': No such file or directory
I do wonder if hardware or software mitigations are in place?