linux-kernel - Re: [RFC PATCH v2 00/13] Kernel based bootsplash

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Date:   Wed, 20 Dec 2017 11:22:36 +0000
From:   Daniel Stone <daniel@...ishbar.org>
To:     Johannes Thumshirn <jthumshirn@...e.de>
Cc:     Max Staudt <mstaudt@...e.de>,
        Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>,
        Linux Fbdev development list <linux-fbdev@...r.kernel.org>,
        michal@...kovi.net, sndirsch@...e.com, oneukum@...e.com,
        tiwai@...e.com, dri-devel <dri-devel@...ts.freedesktop.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        bernhard.rosenkranzer@...aro.org, philm@...jaro.org
Subject: Re: [RFC PATCH v2 00/13] Kernel based bootsplash

Hi Johannes,

On 20 December 2017 at 11:08, Johannes Thumshirn <jthumshirn@...e.de> wrote:
> On Tue, Dec 19, 2017 at 05:16:30PM +0100, Daniel Vetter wrote:
>> Ok I've realized that my assumptions about why you need this aren't
>> So from reading these patches it sounded like you want an in-kernel boot
>> splash because that would be on the display faster than a userspace one
>> like plymouth. That's the only reasons I can see for this (if there's
>> another good justification, please bring it up).
>>
>> I only know of very embedded setups (tv top boxes, in vehicle
>> entertainment) where that kind of "time to first image" really matters,
>> and those systems:
>> - have a real hw kms driver
>> - don't have fbcon or fbdev emulation enabled (except for some closed
>>   source stacks that are a bit slow to adapt to the new world, and we
>>   don't care about those in gfx).
>>
>> But from discussions it sounds like you very much want to use this on
>> servers, which makes 0 sense to me. On a server something like plymouth
>> should do a perfectly reasonable job.
>
> For _one_ reason we'd like to see this is (I was one of the requesters of this
> implementation), plymouth in it's infinite wisdom also grabs the serial (IPMI)
> console and escape characters in a screen log are (you can think of the rest
> of this sentence yourself I think).

You can set 'plymouth.ignore-serial-consoles' on your boot line to
disable this behaviour.

> Also plymouth grabs the escape character of HPE iLOs, which is a serious
> no-go.

I'm not entirely sure what this means, but maybe it's best addressed
as a bug report to the Plymouth developers? One of them is in this
thread.

Cheers,
Daniel