linux-kernel - Re: Pass modules to Linux kernel without initrd

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Message-ID: <8aac3537-e84b-057d-94d8-0327261daaf8@metux.net>
Date:   Tue, 8 Dec 2020 10:38:15 +0100
From:   "Enrico Weigelt, metux IT consult" <lkml@...ux.net>
To:     Paul Menzel <pmenzel@...gen.mpg.de>,
        LKML <linux-kernel@...r.kernel.org>
Cc:     Luis Chamberlain <mcgrof@...nel.org>,
        Hans de Goede <hdegoede@...hat.com>,
        Ben Hutchings <ben@...adent.org.uk>
Subject: Re: Pass modules to Linux kernel without initrd

On 08.12.20 10:24, Paul Menzel wrote:

> Similar to passing firmware and microcode update files to Linux or
> building these into the Linux kernel image, would it be possible to
> append the required modules to the Linux kernel image, and Linux would
> load these?

Indeed, yes it does. Just set the corresponding CONFIG_ symbols to 'y'
instead of 'm'. If you don't need to dynamically load any modules
(already have everything you need compiled-in), you can completely
disable module support via disabling CONFIG_MODULES.

For embedded systems, this is quite common. I'm also using it for
trimmed down virtualized workloads that don't ever need to dynamically
load modules.

--mtx

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Enrico Weigelt, metux IT consult
Free software and Linux embedded engineering
info@...ux.net -- +49-151-27565287