[PATCH v2 0/5] Add support for RPMI to U-Boot

[Heinrich Schuchardt]

On 7/9/26 15:02, Michal Simek wrote:
> 
> 
> On 7/8/26 23:51, Charles Perry wrote:
>> Hello,
>>
>> This series adds support for RISC-V Platform Management Interface 
>> (RPMI) to
>> U-Boot. RPMI is an OS-agnostic protocol for communication between an
>> Application Processor (AP) and a Platform Microcontroller (PuC) [1]. The
>> goals and purpose of RPMI are similar to ARM's SCMI.
> 
>  From the first look it looks like SCMI. Why do you introducing 
> something what can be replaced by SCMI?
> And SCMI has only specific ARM transport layer but the rest is arch 
> independent.
> 
> In our case where we have Microblaze V in programmable logic I can't see 
> any reason to use RPMI for talking to the same server if I need to do it 
> from ARM side too via SCMI.
> 
> I pretty much think that there should be communication with ARM and 
> instead of creating another firmware interface talk to each other and 
> have only one which can be used across multiple architectures.
> 
> Thanks,
> Michal

Hello Michal,

The specifications for RISC-V are produced by RISC-V International. AMD 
is a strategic member. Please, join the relevant technical groups to 
collaborate on specifications.

RISC-V has defined the Supervisor Binary Interface (SBI) specification 
which is available at 
https://github.com/riscv-non-isa/riscv-sbi-doc/releases/download/v3.0/riscv-sbi.pdf.

The Message Proxy (MPXY) extension defines how communication channels 
between different parts of software can be established.

RPMI is one of the defined messaging protocols. The ratified 
specification is available at 
https://github.com/riscv-non-isa/riscv-rpmi/releases/download/v1.0/riscv-rpmi.pdf.

Best regards

Heinrich