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Xbox vesa-like framebuffer
From: |
Robert Millan |
Subject: |
Xbox vesa-like framebuffer |
Date: |
Mon, 31 Dec 2007 16:23:54 +0100 |
User-agent: |
Mutt/1.5.13 (2006-08-11) |
It seems the Xbox (hacked) firmware, Cromwell, sets up a vesa-like framebuffer
with predefined 640x480x32 RGBX settings at addr *(0xfd600800) [1]
I just gave a quick look at vbe.c to see how hard would it be to adapt it to
use default settings rather than BIOS calls. Can someone provide a bit of
advice on what those settings would be? In particular, I wonder about:
`mode' (as returned by grub_vbe_get_video_mode_info())
`active_mode_info.memory_model' (and in case of
GRUB_VBE_MEMORY_MODEL_PACKED_PIXEL,
do we have to setup vga palette?)
`framebuffer.bytes_per_scan_line'
`framebuffer.bytes_per_pixel' --> 4, right?
Anything else I could have missed ? Also, is there an easy way to get debugging
output printed somewhere (before we have to care about font stuff) in the form
of raw pixels ? This thing doesn't seem to have a serial port or any other
simple debugging interface.
[1] from
http://www.xbox-linux.org/wiki/Porting_an_Operating_System_to_the_Xbox_HOWTO#Video_Driver
--
Robert Millan
<GPLv2> I know my rights; I want my phone call!
<DRM> What use is a phone call, if you are unable to speak?
(as seen on /.)
- Xbox vesa-like framebuffer,
Robert Millan <=