| POWER9 Changes to OPAL API |
| ========================== |
| |
| This document is a summary of POWER9 changes to the OPAL API over what it |
| was for POWER7 and POWER8. As the POWER series of processors (at least up |
| to POWER9) require changes in the hypervisor to work on a new processor |
| generation, this gives us an opportunity with POWER9 to clean up several |
| parts of the OPAL API. |
| |
| Eventually, when the kernel drops support for POWER8 and before, we can then |
| remove the associated kernel code too. |
| |
| OPAL_REINIT_CPUS |
| ---------------- |
| Can now be extended beyond HILE BE/LE bits. If invalid flags are set on |
| POWER9, OPAL_UNSUPPORTED will be returned. |
| |
| Device Tree |
| ----------- |
| |
| - ``/ibm,opal/`` compatible property now just lists ``ibm,opal-v3`` and no longer ``ibm,opal-v2`` (power9 and above only) |
| - Use only ``stdout-path`` property from POWER9 and above as usage of ``linux,stdout-path`` is deprecated |
| - Rename ``fsp-ipl-side`` as ``sp-ipl-side`` in ``/ipl-params`` |
| - Add interrupt-parent property for ``/ibm,opal/ipmi`` node on POWER9 and above |
| to make use of OPAL irqchip rather than event interface in linux. |
| |
| TODO |
| ---- |
| Things we still have to do for POWER9: |
| |
| - PCI to use async API rather than returning delays |
| - deprecate/remove v1 APIs where there's a V2 |
| - Fix this FWTS warning: :: |
| |
| FAILED [MEDIUM] DeviceTreeBaseDTCWarnings: Test 3, dtc reports warnings from |
| device tree: Warning (reg_format): "reg" property in /ibm,opal/flash@0 has |
| invalid length (8 bytes) (#address-cells == 0, #size-cells == 0) |
| |
| - Remove mi-version / ml-version from ``/ibm,opal/firmware`` and replace with something better and more portable |