linux-kernel - Re: [PATCH] tty: hvc: Don't enable the RISC-V SBI console by default

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Message-ID: <0e41108b-2a64-2144-34f1-e7c0f1ec952f@sifive.com>
Date: Wed, 14 Feb 2024 07:44:33 -0800 (PST)
From: Paul Walmsley <paul.walmsley@...ive.com>
To: Palmer Dabbelt <palmer@...osinc.com>
cc: linux-riscv@...ts.infradead.org, Greg KH <gregkh@...uxfoundation.org>, 
    jirislaby@...nel.org, Atish Patra <atishp@...osinc.com>, 
    ajones@...tanamicro.com, apatel@...tanamicro.com, 
    linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org, 
    linux-serial@...r.kernel.org, Emil Renner Berthing <kernel@...il.dk>
Subject: Re: [PATCH] tty: hvc: Don't enable the RISC-V SBI console by
 default

On Wed, 14 Feb 2024, Palmer Dabbelt wrote:

> From: Palmer Dabbelt <palmer@...osinc.com>
> 
> The new SBI console has the same problem as the old one: there's only
> one shared backing hardware and no synchronization, so the two drivers
> end up stepping on each other.  This was the same issue the old SBI-0.1
> console drivers had, but that was disabled by default when SBI-0.1 was.
> 
> So just mark the new driver as nonportable.
> 
> Reported-by: Emil Renner Berthing <kernel@...il.dk>
> Fixes: 88ead68e764c ("tty: Add SBI debug console support to HVC SBI driver")
> Signed-off-by: Palmer Dabbelt <palmer@...osinc.com>

Reviewed-by: Paul Walmsley <paul.walmsley@...ive.com>


- Paul