linux-kernel - Re: [PATCH v2] arm64: defconfig: enable EEPROM

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Message-ID: <CAOesGMijByw1FYt42toNF6pAEykks_agetQybhgMQj8nAc6xdg@mail.gmail.com>
Date:   Mon, 17 Oct 2016 14:58:42 -0700
From:   Olof Johansson <olof@...om.net>
To:     Scott Branden <scott.branden@...adcom.com>
Cc:     Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will.deacon@....com>,
        Arnd Bergmann <arnd@...db.de>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        BCM Kernel Feedback <bcm-kernel-feedback-list@...adcom.com>
Subject: Re: [PATCH v2] arm64: defconfig: enable EEPROM_AT25 config option

Hi,

On Wed, Oct 12, 2016 at 11:51 AM, Scott Branden
<scott.branden@...adcom.com> wrote:
> Enable support for on board SPI EEPROM by turning on
> CONFIG_EEPROM_AT25.  This needs to be on in order to
> boot and test the kernel with a static rootfs image
> that is not rebuilt everytime the kernel is rebuilt.

If we did this for every kernel option we'd get a huge kernel.

In general, we've said that static options for what's needed to boot
to rootfs (i.e. storage and network drivers for nfsroot) are fine to
enable statically.

I doubt you need the EEPROM driver to boot to rootfs on your system,
so please enable it as a module instead.

Look into using config fragments in case you need to modify the
options for local builds, it should be a convenient way to have a
small delta to apply to fit your internal needs, instead of completely
forking the config file.

-Olof