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

[Martin Schiller]

On 2025-03-05 14:33, Daniel Golle wrote:
> 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).

OK, so maybe we should name the subtargets like it is done for the mvebu
or sunxi target. (cortexa<X>)

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