linux-kernel - Re: [RFC PATCH 3/3] riscv: Add riscv.fwsz kernel parameter

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Message-ID: <CAAhSdy3+hY1jwNAOrhE0kiCZPMRh4amY3+Mn-NR2TDFQ24orwQ@mail.gmail.com>
Date:   Tue, 23 Nov 2021 09:15:57 +0530
From:   Anup Patel <anup@...infault.org>
To:     Guo Ren <guoren@...nel.org>
Cc:     Palmer Dabbelt <palmer@...belt.com>, atishp@...osinc.com,
        "linux-kernel@...r.kernel.org List" <linux-kernel@...r.kernel.org>,
        linux-riscv <linux-riscv@...ts.infradead.org>,
        Linux Doc Mailing List <linux-doc@...r.kernel.org>,
        Guo Ren <guoren@...ux.alibaba.com>,
        Anup Patel <anup.patel@....com>
Subject: Re: [RFC PATCH 3/3] riscv: Add riscv.fwsz kernel parameter

On Tue, Nov 23, 2021 at 7:27 AM <guoren@...nel.org> wrote:
>
> From: Guo Ren <guoren@...ux.alibaba.com>
>
> The firmware of riscv (such as opensbi) occupy 2MB(64bit) /
> 4MB(32bit) in Linux. It's very wasteful to small memory footprint
> soc chip such as Allwinner D1s/F133. The kernel parameter gives a
> chance to users to set the proper size of the firmware and get
> more than 1.5MB of memory.

This kernel parameter is redundant see my comment on other patch.

regards,
Anup

>
> Signed-off-by: Guo Ren <guoren@...ux.alibaba.com>
> Cc: Palmer Dabbelt <palmer@...belt.com>
> Cc: Anup Patel <anup.patel@....com>
> Cc: Atish Patra <atishp@...osinc.com>
> ---
>  Documentation/admin-guide/kernel-parameters.txt | 3 +++
>  1 file changed, 3 insertions(+)
>
> diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt
> index 9725c546a0d4..ee505743c8f4 100644
> --- a/Documentation/admin-guide/kernel-parameters.txt
> +++ b/Documentation/admin-guide/kernel-parameters.txt
> @@ -4964,6 +4964,9 @@
>                         [KNL] Disable ring 3 MONITOR/MWAIT feature on supported
>                         CPUs.
>
> +       riscv.fwsz=nn[KMG]
> +                       [RISC-V] Determine firmware size to save memory
> +
>         ro              [KNL] Mount root device read-only on boot
>
>         rodata=         [KNL]
> --
> 2.25.1
>