linux-kernel - Re: [RFC PATCH 1/2] riscv: vendors: andes: Add support to configure the PMA regions

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Date:   Thu, 8 Sep 2022 15:20:11 +0200
From:   Geert Uytterhoeven <geert@...ux-m68k.org>
To:     Biju Das <biju.das.jz@...renesas.com>
Cc:     "Conor.Dooley@...rochip.com" <Conor.Dooley@...rochip.com>,
        "atishp@...shpatra.org" <atishp@...shpatra.org>,
        "palmer@...belt.com" <palmer@...belt.com>,
        "guoheyi@...ux.alibaba.com" <guoheyi@...ux.alibaba.com>,
        "guoren@...ux.alibaba.com" <guoren@...ux.alibaba.com>,
        Prabhakar Mahadev Lad <prabhakar.mahadev-lad.rj@...renesas.com>,
        "paul.walmsley@...ive.com" <paul.walmsley@...ive.com>,
        "aou@...s.berkeley.edu" <aou@...s.berkeley.edu>,
        "atishp@...osinc.com" <atishp@...osinc.com>,
        "apatel@...tanamicro.com" <apatel@...tanamicro.com>,
        "linux-riscv@...ts.infradead.org" <linux-riscv@...ts.infradead.org>,
        "linux-renesas-soc@...r.kernel.org" 
        <linux-renesas-soc@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "prabhakar.csengg@...il.com" <prabhakar.csengg@...il.com>
Subject: Re: [RFC PATCH 1/2] riscv: vendors: andes: Add support to configure
 the PMA regions

Hi Biju,

On Thu, Sep 8, 2022 at 3:01 PM Biju Das <biju.das.jz@...renesas.com> wrote:
> > Subject: Re: [RFC PATCH 1/2] riscv: vendors: andes: Add support to
> > configure the PMA regions
> >
> > On 08/09/2022 09:39, Biju Das wrote:
> > > EXTERNAL EMAIL: Do not click links or open attachments unless you know
> > > the content is safe
> > >
> > > Hi Conor, Atish,
> > >
> > > What RISC-V devices you have?
> >
> > A bunch ;)
> >
> > A __couple__ PolarFire SoC boards, HiFive Unleashed, D1 Nezha, Canaan
> > k210 MAIX something & the VisionFive.
>
> If standard DMA api works without any issue means, on these platforms
> IO Coherence port is enabled in the hardware. So all peripherals
> involving DMA work as expected.
>
> > > Ours is RISC-V uniprocessor without IO Coherence Port.
> >
> > What does "IO Coherence Port" mean? Zicbo*?
>
> The HW will provide coherency between CPU and peripheral.
>
> If Zibco* is uniprocessor, then highly it may not have IO coherence
> Port enabled in their design.

Zicbo* is a set of extensions for the instructions.
These cannot be retrofitted to existing silicon, but perhaps they can
be trapped and emulated?

Gr{oetje,eeting}s,

                        Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds