[openbeos] Re: "Porting" video drivers from R5 to Haiku. Any changes required?

Siarzhuk Zharski <zharik@xxxxxx> wrote:
> One of my friends asked me to help in running S3 Savage graphic card 
> under Haiku. He tried to use BeSavage++ drivers available on bebits 
> (http://bebits.com/app/3378) but have no success - black screen and 
> hang 
> up on system initialization. VESA driver on same system is OK. I have 
> build those sources for Haiku but the behavior was the same. Is it 
> required to change something in R5 driver source code to force it to 
> work under Haiku?

It shouldn't be necessary. The only thing I know that Haiku is more 
strict about are const data. For example this works fine on BeOS, but 
won't on Haiku:

char *a = "b";
*a = 'c';

"b" is a read-only location and cannot be changed this way (this also 
crashes in BeOS userland).

The other thing would be B_USER_CLONEABLE_AREA but we've disabled this 
flag for now.
Of course, there might be slight incompatibilities between the 
app_server API that we know, and the one implemented by BeSavage++. Is 
there any way to emulate such a card?

Bye,
   Axel.

Other related posts: