[OpenBIOS] Why some Linux distributions start booting to black screens

Mark Cave-Ayland mark.cave-ayland at ilande.co.uk
Wed Mar 9 07:38:04 CET 2016

On 08/03/16 20:31, Programmingkid wrote:

> On Mar 8, 2016, at 2:42 PM, Mark Cave-Ayland wrote:
>> On 08/03/16 03:55, Programmingkid wrote:
>>> Some Linux distributions like Fedora start booting to an all black screen. I found out the reason why is because there appears to be something wrong with the screen node's color! word. 
>>> If you type these commands in OpenBIOS:
>>> dev screen
>>> see color!
>>> You will see that color! is empty. This would definitely prevent the color of text from being changed. 
>> color! definitely does work as I spent some time digging into it when I
>> rewrote the framebuffer code a while back. The issue seemed either
>> endian or depth related because the problem goes away in 8-bit mode,
>> e.g. try booting with -g 800x600x8 but I didn't really dig that far.
> Why is it when I 'see' color! in OpenBIOS, the word is empty?

Well the "see" routines in OpenBIOS aren't 100% complete IIRC. Take a
look at driver/vga.fs and in particular color! which should call into
the VGA palette routines.



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