linux-kernel - Re: Introducing the LCD-Linux project

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Message-ID: <20100722122111.4cf4ca2f@lxorguk.ukuu.org.uk>
Date:	Thu, 22 Jul 2010 12:21:11 +0100
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	Mattia Jona-Lasinio <mattia.jona@...il.com>
Cc:	linux-kernel@...r.kernel.org,
	Miguel Ojeda Sandonis <miguel.ojeda.sandonis@...il.com>,
	Willy Tarreau <w@....eu>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linus Walleij <triad@...lth.se>,
	linux-arm-kernel@...ts.infradead.org,
	Russell King <linux@....linux.org.uk>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	ivan.kuten@...mwad.com, lcd-linux-users@...ts.sourceforge.net,
	Viktar Palstsiuk <viktar.palstsiuk@...mwad.com>
Subject: Re: Introducing the LCD-Linux project

On Wed, 21 Jul 2010 14:57:54 +0200
Mattia Jona-Lasinio <mattia.jona@...il.com> wrote:

> Hi,
> 
> this is to introduce the LCD-Linux project (http://lcd-linux.sourceforge.net/),
> a kernel level implementation of a VT102 terminal emulator, optimized for small
> alphanumeric and graphic displays.

The kernel already has a console and that provides an abstract
implementation that is used for everything from text mode displays to vga
to assorted accelerated hardware platforms.

Why do we need a VT102 as well ?

> functions. A solution is therefore to provide a sort of minimal terminal
> emulation in kernel space, that can be accessed through the standard character
> device interface. In this way the problem of the display management is reduced

If you use the existing kernel console interfaces then you don't need to
worry about vt102 v console or having two terminal emulations running.

The basic idea seems sound enough other than that. Another reason for
using the kernel console/vt driver is that you can then also support mini
bitmap displays because a frame buffer driver backed by a driver for a
suitable LCD panel can work nicely because the vt driver can sit on the
fb layer quite happily and fb then implements low level handling for the
pixels.

Alan
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