BPI-R4 with Filogic 880 (Arm Cortex-A73): Spectre-BHB.

[Martin Schiller]

CONFIG_MITIGATE_SPECTRE_BRANCH_HISTORY was disabled with commit
6b007d2512ad (treewide: disable spectre mitigation on unaffected Arm64
targets) for all targets in target/linux/mediatek/filogic folder, but
the Arm Cortex-A73 in the Filogic 880 are affected [0].

So should we enable CONFIG_MITIGATE_SPECTRE_BRANCH_HISTORY for this
subtarget again?

On the other hand, the target.mk in this subtarget folder states it is
CPU_TYPE:=cortex-a53, which is not correct for all the supported systems
in this subtarget.

Do we have to split this subtarget into filogic830, filogic880, etc.?

Regards,
Martin

[0] 
https://developer.arm.com/Arm%20Security%20Center/Speculative%20Processor%20Vulnerability