Re: [PATCH v3 3/9] remoteproc: qcom_q6v5_mss: Add MDM9607

Konrad Dybcio
2026-01-02T14:03:03Z

On 1/2/26 1:59 PM, Bryan O'Donoghue wrote:
> On 02/01/2026 12:00, Konrad Dybcio wrote:
>>> Is there an io-fabric in the world which exceeds 1 microsecond to perform a write transaction ?
>> Writes on arm64 aren't usually observable from the remote endpoint when
>> you would expect them to, they can be buffered unless there's an explicit
>> readback right afterwards (which creates a dependency that the processor
>> will fulfill)
>
> I don't mean write-combining cache, I mean posted versus non-posted writes which is a feature of the front-side-bus :)

Writes are posted (Device-nGnRE, note the E attribute is set)

https://documentation-service.arm.com/static/63a43e333f28e5456434e18b

Konrad