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

[Daniel Golle]

On Wed, Mar 05, 2025 at 02:13:04PM +0100, Martin Schiller wrote:
> 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.?

Imho it would make most sense to merge all the A53 subtargets, ie. no
longer treat MT7622 separately. Afaik there is no real reason to do this.
Then we can have a new A73 subtarget for MT7988 (and potentially other
future SoC).

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