From: Sascha Hauer <s.hauer@pengutronix.de>
To: Antony Pavlov <antonynpavlov@gmail.com>
Cc: barebox@lists.infradead.org
Subject: Re: [RFC] WIP: video: implement quick-n-dirty framebuffer console
Date: Thu, 9 Jul 2015 12:46:37 +0200 [thread overview]
Message-ID: <20150709104637.GS18700@pengutronix.de> (raw)
In-Reply-To: <20150709124254.3aeed69d7330aebd34377e12@gmail.com>
On Thu, Jul 09, 2015 at 12:42:54PM +0300, Antony Pavlov wrote:
> On Thu, 9 Jul 2015 08:49:20 +0200
> Sascha Hauer <s.hauer@pengutronix.de> wrote:
>
> > Hi Antony,
> >
> > On Wed, Jul 08, 2015 at 12:15:39PM +0300, Antony Pavlov wrote:
> > > This patch realizes very simple framebuffer console for barebox.
> > > Minimal ANSI/VT100 Escape Sequence parser is used to ignore color
> > > change commands (based on GNU screen parser).
> > >
> > > THere are several ANSI/VT100 parsers:
> > >
> > > * GNU screen (git://git.savannah.gnu.org/screen.git);
> > > * st - simple terminal (http://git.suckless.org/st);
> > > * or even mutt (https://github.com/karelzak/mutt-kz).
> >
> > There's even one in barebox in drivers/serial/efi-stdio.c
> >
> > >
> > > fbconsole mini-HOWTO
> > > ====================
> > >
> > > 1. compile sandbox barebox with
> > >
> > > CONFIG_VIDEO=y
> > > CONFIG_FBCONSOLE=y
> > > CONFIG_DRIVER_VIDEO_SDL=y
> > >
> > > 2. run barebox
> > >
> > > 3. test fbconsole
> > >
> > > fbconsole0.active=o
> >
> > I gave it a try on real hardware. Works nice.
> >
> > >
> > > TODO:
> > >
> > > * no visible cursor;
> >
> > I couldn't resist and did some hacking on this. The cursor is visible
> > now. Also I implemented more control characters and color support. I'll
> > send an update patch shortly.
> >
> > > * FIXME: /dev/fb0 is hardcoded;
> > > * FIXME: drop blanckchar() dirty hack;
> > > * Sascha Hauer: character set should be prerendered for the actual framebuffer format
> > > before printing a string.
> >
> > Did I mention that ealier? I don't know if that's a good idea since with
> > color support we would need quite some memory and I'm not sure if that
> > would really speed up things.
> >
> > I'd really love to have framebuffer console in barebox. I wasn't aware
> > that this would be relatively straight forward to implement though. I'm
> > willing to help working on this job so that we finally have a fbcon.
> >
> > Maybe one first step is to simply merge the font so that the patches
> > get smaller.
>
> IMHO it is very reasonable to add simple tools and instruction for
> font modifing. We even can add several fonts and select one of them
> via Kconfig options as linux kernel does. There are some reasons
> for that:
>
> * some people prefere another fonts (e.g. Terminus);
> * in Russia we need a font with cyrillic letters.
Ok. I'm happy to add this later, but if you want to add this from the
start, fine aswell.
>
> Also I prefere fix original font header file.
> Here is an example.
>
> 1. original font header file fragment:
>
> + /* 65 0x41 */
> + 0x00, /* 00000000 */
> + 0x00, /* 00000000 */
> + 0x10, /* 00010000 */
> + 0x38, /* 00111000 */
> + 0x6c, /* 01101100 */
> + 0xc6, /* 11000110 */
> + 0xc6, /* 11000110 */
> + 0xfe, /* 11111110 */
> + 0xc6, /* 11000110 */
> + 0xc6, /* 11000110 */
> + 0xc6, /* 11000110 */
> + 0xc6, /* 11000110 */
> + 0x00, /* 00000000 */
> + 0x00, /* 00000000 */
> + 0x00, /* 00000000 */
> + 0x00, /* 00000000 */
> +
>
> 2. my version
> + /* 65 0x41 'A' */
> + 0x00, /* ........ */
> + 0x00, /* ........ */
> + 0x10, /* ...#.... */
> + 0x38, /* ..###... */
> + 0x6c, /* .##.##.. */
> + 0xc6, /* ##...##. */
> + 0xc6, /* ##...##. */
> + 0xfe, /* #######. */
> + 0xc6, /* ##...##. */
> + 0xc6, /* ##...##. */
> + 0xc6, /* ##...##. */
> + 0xc6, /* ##...##. */
> + 0x00, /* ........ */
> + 0x00, /* ........ */
> + 0x00, /* ........ */
> + 0x00, /* ........ */
Yeah, that's much better to read.
Sascha
--
Pengutronix e.K. | |
Industrial Linux Solutions | http://www.pengutronix.de/ |
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next prev parent reply other threads:[~2015-07-09 10:47 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-07-08 9:15 Antony Pavlov
2015-07-09 6:49 ` Sascha Hauer
2015-07-09 9:42 ` Antony Pavlov
2015-07-09 10:46 ` Sascha Hauer [this message]
2015-07-09 8:16 ` Sascha Hauer
2015-07-09 9:47 ` Antony Pavlov
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