Re: [PATCH 1/1] riscv: default to CONFIG_RISCV_SBI_V01=n

[Heinrich Schuchardt]

On 12/16/21 17:51, Jessica Clarke wrote:
> On 16 Dec 2021, at 14:17, Heinrich Schuchardt <heinrich.schuchardt@xxxxxxxxxxxxx> wrote:
> > On 12/16/21 14:49, Jessica Clarke wrote:
> > > On 16 Dec 2021, at 12:35, Heinrich Schuchardt <heinrich.schuchardt@xxxxxxxxxxxxx> wrote:
> > > > The SBI 0.1 specification is obsolete. The current version is 0.3.
> > > > Hence we should not rely by default on SBI 0.1 being implemented.
> > > It’s what BBL implements, and some people are still using it,
> > > especially given early hardware shipped before OpenSBI grew in
> > > popularity.
> > > Jess
> >
> > Do you mean BBL is not developed anymore?
> >
> > Some people may still be using a 0.1 SBI. But that minority stuck on an outdated software stack does not justify defaulting to deprecated settings in future Linux releases.
>
> BBL is still actively maintained; its most recent commit was 24 days
> ago. Also, the amount of code CONFIG_RISCV_SBI_V01 affects is tiny, so
> I see no tangible benefit from making this change, just unnecessary
> breakage of perfectly functional systems.

Only the default is changed. How could this break any existing system?
You can still compile with the deprecated setting.

I can not see why we should keep a default that will cause issues on 
systems complying to the current SBI specification.

Best regards

Heinrich