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Subject: Re: [PATCH 1/1] riscv: default to CONFIG_RISCV_SBI_V01=n
From:   Jessica Clarke <jrtc27@jrtc27.com>
In-Reply-To: <fd40010f-f2ec-b32a-6850-1e054af43725@canonical.com>
Date:   Thu, 16 Dec 2021 16:51:28 +0000
Cc:     Paul Walmsley <paul.walmsley@sifive.com>,
        Palmer Dabbelt <palmer@dabbelt.com>,
        Albert Ou <aou@eecs.berkeley.edu>,
        linux-riscv@lists.infradead.org, linux-kernel@vger.kernel.org
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Message-Id: <150C4E84-2C69-45DB-AF27-1E0C223D8D7A@jrtc27.com>
References: <20211216123538.175087-1-heinrich.schuchardt@canonical.com>
 <BC1B38E7-1170-4C05-948A-D18E80AC49E7@jrtc27.com>
 <fd40010f-f2ec-b32a-6850-1e054af43725@canonical.com>
To:     Heinrich Schuchardt <heinrich.schuchardt@canonical.com>
Precedence: bulk

On 16 Dec 2021, at 14:17, Heinrich Schuchardt =
<heinrich.schuchardt@canonical.com> wrote:
>=20
> On 12/16/21 14:49, Jessica Clarke wrote:
>> On 16 Dec 2021, at 12:35, Heinrich Schuchardt =
<heinrich.schuchardt@canonical.com> wrote:
>>>=20
>>> The SBI 0.1 specification is obsolete.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=E2=80=99s what BBL implements, and some people are still using it,
>> especially given early hardware shipped before OpenSBI grew in
>> popularity.
>> Jess
>=20
> Do you mean BBL is not developed anymore?
>=20
> 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an outdated software stack does not justify defaulting to deprecated =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.

Jess