69 lines
2.0 KiB
Plaintext
69 lines
2.0 KiB
Plaintext
|
|
||
|
|
arkfb - fbdev driver for ARK Logic chips
|
||
|
|
========================================
|
||
|
|
|
||
|
|
|
||
|
|
Supported Hardware
|
||
|
|
==================
|
||
|
|
|
||
|
|
ARK 2000PV chip
|
||
|
|
ICS 5342 ramdac
|
||
|
|
|
||
|
|
- only BIOS initialized VGA devices supported
|
||
|
|
- probably not working on big endian
|
||
|
|
|
||
|
|
|
||
|
|
Supported Features
|
||
|
|
==================
|
||
|
|
|
||
|
|
* 4 bpp pseudocolor modes (with 18bit palette, two variants)
|
||
|
|
* 8 bpp pseudocolor mode (with 18bit palette)
|
||
|
|
* 16 bpp truecolor modes (RGB 555 and RGB 565)
|
||
|
|
* 24 bpp truecolor mode (RGB 888)
|
||
|
|
* 32 bpp truecolor mode (RGB 888)
|
||
|
|
* text mode (activated by bpp = 0)
|
||
|
|
* doublescan mode variant (not available in text mode)
|
||
|
|
* panning in both directions
|
||
|
|
* suspend/resume support
|
||
|
|
|
||
|
|
Text mode is supported even in higher resolutions, but there is limitation to
|
||
|
|
lower pixclocks (i got maximum about 70 MHz, it is dependent on specific
|
||
|
|
hardware). This limitation is not enforced by driver. Text mode supports 8bit
|
||
|
|
wide fonts only (hardware limitation) and 16bit tall fonts (driver
|
||
|
|
limitation). Unfortunately character attributes (like color) in text mode are
|
||
|
|
broken for unknown reason, so its usefulness is limited.
|
||
|
|
|
||
|
|
There are two 4 bpp modes. First mode (selected if nonstd == 0) is mode with
|
||
|
|
packed pixels, high nibble first. Second mode (selected if nonstd == 1) is mode
|
||
|
|
with interleaved planes (1 byte interleave), MSB first. Both modes support
|
||
|
|
8bit wide fonts only (driver limitation).
|
||
|
|
|
||
|
|
Suspend/resume works on systems that initialize video card during resume and
|
||
|
|
if device is active (for example used by fbcon).
|
||
|
|
|
||
|
|
|
||
|
|
Missing Features
|
||
|
|
================
|
||
|
|
(alias TODO list)
|
||
|
|
|
||
|
|
* secondary (not initialized by BIOS) device support
|
||
|
|
* big endian support
|
||
|
|
* DPMS support
|
||
|
|
* MMIO support
|
||
|
|
* interlaced mode variant
|
||
|
|
* support for fontwidths != 8 in 4 bpp modes
|
||
|
|
* support for fontheight != 16 in text mode
|
||
|
|
* hardware cursor
|
||
|
|
* vsync synchronization
|
||
|
|
* feature connector support
|
||
|
|
* acceleration support (8514-like 2D)
|
||
|
|
|
||
|
|
|
||
|
|
Known bugs
|
||
|
|
==========
|
||
|
|
|
||
|
|
* character attributes (and cursor) in text mode are broken
|
||
|
|
|
||
|
|
--
|
||
|
|
Ondrej Zajicek <santiago@crfreenet.org>
|