linux-kernel - Re: ARC no console output (was Re: [PATCH 1/2] init/console: Use ttynull as a fallback when there is no console)

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Message-ID: <50ade852-c598-6476-1f4b-9a3f8d11d143@synopsys.com>
Date:   Thu, 7 Jan 2021 08:43:16 -0800
From:   Vineet Gupta <vgupta@...opsys.com>
To:     John Ogness <john.ogness@...utronix.de>,
        Petr Mladek <pmladek@...e.com>,
        Sergey Senozhatsky <sergey.senozhatsky@...il.com>,
        Steven Rostedt <rostedt@...dmis.org>
Cc:     Linus Torvalds <torvalds@...ux-foundation.org>,
        Guenter Roeck <linux@...ck-us.net>,
        Shreyas Joshi <shreyas.joshi@...mp.com>,
        shreyasjoshi15@...il.com,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Sergey Senozhatsky <sergey.senozhatsky.work@...il.com>,
        linux-kernel@...r.kernel.org, buildroot@...ybox.net,
        Thomas Petazzoni <thomas.petazzoni@...tlin.com>,
        linux-arch@...r.kernel.org,
        arcml <linux-snps-arc@...ts.infradead.org>
Subject: Re: ARC no console output (was Re: [PATCH 1/2] init/console: Use
 ttynull as a fallback when there is no console)

Hi John,

On 1/7/21 1:02 AM, John Ogness wrote:
> Hi Vineet,
> 
> On 2021-01-06, Vineet Gupta <vgupta@...opsys.com> wrote:
>> This breaks ARC booting (no output on console).
> 
> Could you provide the kernel boot arguments that you use? This series is
> partly about addressing users that have used boot arguments that are
> technically incorrect (even if had worked). Seeing the boot arguments of
> users that are not experiencing problems may help to reveal some of the
> unusual console usages until now.


Kernel command line: earlycon=uart8250,mmio32,0xf0005000,115200n8 
console=ttyS0,115200n8 debug print-fatal-signals=1

And we do have serial driver built-in.

Thx,
-Vineet