linux-kernel - Re: [PATCH 2/6] wl1251: Use request_firmware_prefer

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Message-ID: <CA+BoTQnNFWFNe1W9nO+Kwp0oZaPuGZX=0F=MX3+m7X-ekNYPPQ@mail.gmail.com>
Date:   Wed, 1 Feb 2017 10:35:03 +0100
From:   Michal Kazior <michal.kazior@...to.com>
To:     Pali Rohár <pali.rohar@...il.com>
Cc:     Tony Lindgren <tony@...mide.com>,
        Kalle Valo <kvalo@...eaurora.org>, Pavel Machek <pavel@....cz>,
        Arend Van Spriel <arend.vanspriel@...adcom.com>,
        Ming Lei <ming.lei@...onical.com>,
        "Luis R. Rodriguez" <mcgrof@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        David Gnedt <david.gnedt@...izone.at>,
        Daniel Wagner <wagi@...om.org>,
        Sebastian Reichel <sre@...nel.org>,
        Ivaylo Dimitrov <ivo.g.dimitrov.75@...il.com>,
        Aaro Koskinen <aaro.koskinen@....fi>,
        Grazvydas Ignotas <notasas@...il.com>,
        linux-kernel@...r.kernel.org,
        linux-wireless <linux-wireless@...r.kernel.org>,
        Network Development <netdev@...r.kernel.org>
Subject: Re: [PATCH 2/6] wl1251: Use request_firmware_prefer_user() for
 loading NVS calibration data

On 1 February 2017 at 09:33, Pali Rohár <pali.rohar@...il.com> wrote:
> On Tuesday 31 January 2017 07:59:18 Tony Lindgren wrote:
>> * Kalle Valo <kvalo@...eaurora.org> [170130 22:36]:
[...]
>> > * before distro updates linux-firmware create yours own deb/rpm/whatever
>> >   package "wl1251-firmware" which installs your flavor of nvs file (or
>> >   the user fallback helper if more dynamic functionality is preferred)
>>
>> And that won't work when using the same file system on other machines.
>>
>> Think NFSroot for example. At least I'm using the same NFSroot across
>> about 15 different machines including one n900 macro board with smc91x
>> Ethernet.
>
> Exactly problem which we already discussed in previous emails. You
> cannot serve one file (loaded by direct request_firmware) when your
> rootfs is readonly, e.g. comes via NFS shared for more devices...

You can extract the nvs blob, put it in tmpfs and bind-mount (or
symlink) it to /lib/firmware/ via modprobe install hook (or init
scripts).


Michał