On Mon, Aug 31, 2026 at 10:07 PM +0200, Valentin Haudiquet wrote:
> I believe one of the issues is that the v3 HSM wakes A100 core 8 only
> when Linux onlines CPU 8. The vendor kernel onlines all 16 CPUs
> so ESOS starts and RPMI works. Mainline uses only the X100 complex
> (harts 0-7), so CPU 8 is never onlined, core 8 is never woken,
> ESOS never runs, and RPMI mailbox transactions time out.
> Patch 3/3 wakes core 8 in OpenSBI pre_init so ESOS is available
> regardless of which CPUs Linux uses.
>
> [...]
>
> I have adapted those patches from the Spacemit OpenSBI 1.6 vendor tree
> logic, through a lot of trial and error. I'm not sure I deeply understand
> the hardware-specific details at play, so any comments would be appreciated.
>
> Feel free to take this in as part of the patchseries and modify it if needed,
> or send review comments and I can also improve them.

The original scope of this series is the K3 platform initialization and
HSM support needed to bring up the X100 and A100 harts. It is not
intended to reproduce the vendor SDK firmware ABI in the initial series.

In the mainline K3 DT, regulators are managed directly by Linux through
the P1 PMIC driver. It contains no K3 RPMI regulator or power-domain
interface, so this boot path does not depend on ESOS.

Your changes appear to additionally target compatibility with the vendor
SDK stack. That may be useful, but it is outside the scope of this initial
series. Support for the vendor SDK stack can be considered separately in
the future if needed.

                                            - Troy