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From: Krzysztof Kozlowski <krzk@kernel.org>
Date: Thu, 28 Sep 2017 14:22:03 +0200
Message-ID: <CAJKOXPeN+Rtseaz+szF6-QFqq2kRYPVEwy+t8NTqO6VyefUiJg@mail.gmail.com>
Subject: Re: [PATCH] ARM: multi_v7_defconfig: Enable USB3503 driver
To: =?UTF-8?Q?Linus_L=C3=BCssing?= <linus.luessing@c0d3.blue>
Cc: linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org,
        linux-samsung-soc@vger.kernel.org, Kukjin Kim <kgene@kernel.org>,
        Russell King <linux@armlinux.org.uk>,
        Tobias Jakobi <tjakobi@math.uni-bielefeld.de>
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On Thu, Sep 28, 2017 at 12:43 PM, Linus Lüssing
<linus.luessing@c0d3.blue> wrote:
> Hi Krzysztof,
>
> Thanks for your quick reply!
>
> On Thu, Sep 28, 2017 at 08:21:26AM +0200, Krzysztof Kozlowski wrote:
>> [...]
>> Anyway please define this as a module (unless it can't... but it
>> worked in my case).
>
> In that case you used an initrd, right? I see various cases of USB
> built-ins, like CONFIG_USB_STORAGE=y, CONFIG_USB_DWC2=y and so on in
> multi_v7_defconfig. So my impression was that multi_v7_defconfig was
> supposed to allow booting a rootfs from a USB storage device even
> without an initrd.

We use modules for multi_v7 as much as possible with that exception as
fair as I remember - no need of initramfs/initrd for boots. If this is
your intention, please mention this in commit message ("using usb3503
as builtin to provide boot from USB without initrd/initramfs").

Best regards,
Krzysztof