linux-kernel - Re: [PATCH v3 6/7] riscv: dts: starfive: Add initial StarFive JH7110 device tree

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Date:   Wed, 1 Feb 2023 15:53:05 +0800
From:   Hal Feng <hal.feng@...rfivetech.com>
To:     Conor Dooley <conor@...nel.org>, Icenowy Zheng <uwu@...nowy.me>
CC:     <linux-riscv@...ts.infradead.org>, <devicetree@...r.kernel.org>,
        "Palmer Dabbelt" <palmer@...belt.com>,
        Rob Herring <robh+dt@...nel.org>,
        "Krzysztof Kozlowski" <krzysztof.kozlowski+dt@...aro.org>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Albert Ou <aou@...s.berkeley.edu>,
        Ben Dooks <ben.dooks@...ive.com>,
        Daniel Lezcano <daniel.lezcano@...aro.org>,
        "Thomas Gleixner" <tglx@...utronix.de>,
        Marc Zyngier <maz@...nel.org>, Stephen Boyd <sboyd@...nel.org>,
        Michael Turquette <mturquette@...libre.com>,
        "Philipp Zabel" <p.zabel@...gutronix.de>,
        Linus Walleij <linus.walleij@...aro.org>,
        Emil Renner Berthing <emil.renner.berthing@...onical.com>,
        <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v3 6/7] riscv: dts: starfive: Add initial StarFive JH7110
 device tree

On Thu, 29 Dec 2022 09:02:15 +0000, Conor Dooley wrote:
> Hey Icenowy, Hal
> 
> On 29 December 2022 05:25:00 GMT, Icenowy Zheng <uwu@...nowy.me> wrote:
>>在 2022-12-28星期三的 22:48 +0000，Conor Dooley写道：
>>> Hey,
>>> 
>>> On Tue, Dec 20, 2022 at 09:12:46AM +0800, Hal Feng wrote:
[...]
>>> > +               U74_1: cpu@1 {
>>> > +                       compatible = "sifive,u74-mc", "riscv";
>>> > +                       reg = <1>;
>>> > +                       d-cache-block-size = <64>;
>>> > +                       d-cache-sets = <64>;
>>> > +                       d-cache-size = <32768>;
>>> > +                       d-tlb-sets = <1>;
>>> > +                       d-tlb-size = <40>;
>>> > +                       device_type = "cpu";
>>> > +                       i-cache-block-size = <64>;
>>> > +                       i-cache-sets = <64>;
>>> > +                       i-cache-size = <32768>;
>>> > +                       i-tlb-sets = <1>;
>>> > +                       i-tlb-size = <40>;
>>> > +                       mmu-type = "riscv,sv39";
>>> > +                       next-level-cache = <&ccache>;
>>> > +                       riscv,isa = "rv64imafdc";
>>> 
>>> That also begs the question:
>>> Do your u74s support RV64GBC, as the (current) SiFive documentation
>>> suggests?
>>
>>It supports RV64GCZbaZbb.
> 
> Sweet, thanks.
> 
>>B is not a well-defined thing by specifications, so it should be
>>prevented here.
> 
> Yah, don't worry - my next question was going to be which bits were supported :)
> 
> Hal, can you update the isa string in the next version please?

The current isa description is correct. Please see my reply [1].
Thank you.

[1] https://lore.kernel.org/all/c507e0b2-5ca3-cffe-55d2-873ed8c24e3d@starfivetech.com/

Best regards,
Hal