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Date:   Wed, 28 Mar 2018 11:59:42 +0800
From:   Guo Ren <ren_guo@c-sky.com>
To:     Arnd Bergmann <arnd@arndb.de>
Cc:     linux-arch <linux-arch@vger.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
        Thomas Gleixner <tglx@linutronix.de>,
        Daniel Lezcano <daniel.lezcano@linaro.org>,
        Jason Cooper <jason@lakedaemon.net>,
        c-sky_gcc_upstream@c-sky.com, gnu-csky@mentor.com,
        thomas.petazzoni@bootlin.com, wbx@uclibc-ng.org
Subject: Re: [PATCH 17/19] csky: defconfig
Message-ID: <20180328035942.GA23588@guoren>
References: <cover.1521399976.git.ren_guo@c-sky.com>
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 <CAK8P3a3L-zO3K5qcmBPChhSqh+E6WtNRFV1cJRbksGZ74uaEAQ@mail.gmail.com>
 <20180327022128.GB10185@guoren>
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On Tue, Mar 27, 2018 at 09:48:23AM +0200, Arnd Bergmann wrote:
> On Tue, Mar 27, 2018 at 4:21 AM, Guo Ren <ren_guo@c-sky.com> wrote:
> > On Mon, Mar 26, 2018 at 03:16:31PM +0200, Arnd Bergmann wrote:
> 
> >> > +CONFIG_CFG80211=y
> >> > +CONFIG_CFG80211_DEBUGFS=y
> >> > +CONFIG_CFG80211_WEXT=y
> >>
> >> I would guess you want IPV6 but not WEXT here.
> > Gx6605s devlepment board support usb-wifi.
> > Perhaps WEXT is needed by iwconfig or iwlist? So I just enable it.
> > However, I'll consider to remove it.
> 
> I think it's only for backwards compatibility with old versions of
> those tools. There are some older drivers that use WEXT as the
> native interface, but CFG80211 based drivers have a netlink
> interface.
Thx for remind. I'll check.

> 
> >> > +CONFIG_FB=y
> >> > +CONFIG_FB_TILEBLITTING=y
> >> > +CONFIG_FB_SIMPLE=y
> >> > +CONFIG_BACKLIGHT_LCD_SUPPORT=y
> >> > +# CONFIG_LCD_CLASS_DEVICE is not set
> >> > +# CONFIG_BACKLIGHT_CLASS_DEVICE is not set
> >> > +# CONFIG_VGA_CONSOLE is not set
> >> > +CONFIG_FRAMEBUFFER_CONSOLE=y
> >> > +CONFIG_FRAMEBUFFER_CONSOLE_DETECT_PRIMARY=y
> >> > +CONFIG_FRAMEBUFFER_CONSOLE_ROTATION=y
> >> > +CONFIG_LOGO=y
> >> > +# CONFIG_LOGO_LINUX_MONO is not set
> >> > +# CONFIG_LOGO_LINUX_VGA16 is not set
> >>
> >> For new platforms, using the DRM subsystem is the recommend
> >> way to do graphics, it mostly replaces the framebuffer subsystem
> >> here.
> > These used by:
> > https://github.com/c-sky/addons-linux/tree/master/addons/drivers/video/fbdev/nationalchip
> >
> > I'll consider the DRM subsystem.
> 
> It used to be rather hard to write a new DRM driver, but that has
> improved a lot recently. You might be able to fit your driver into
> drivers/gpu/drm/tinydrm/, or maybe do something a bit more complex
> like drivers/gpu/drm/pl111/ or drivers/gpu/drm/stm/.
For this patchset, I won't upstream the fbdev driver. I'll remove the
CONFIG_FB in defconfig first.

Thx for remind about the develop-tips, and it's very helpful.

Best Regards
 Guo Ren