RE: [OpenBIOS] VESA & DMA

[Marcus Gossner]

> Hi everybody,
>
> This has not much to do with the OpenBIOS project, but with low level
> programming. Everyone here seems to know lot of things in this domain,
> that's why i'm asking to all of u those questions :
> Can we setup a VESA 2 (not VESA 3 !) configuration (select video
>
> mode, and everything) without making a int 0x10 ? We're programming a
> protected mode OS, and switching to VM86 sucks. I know it's possible
> with VESA 3, but with VESA 2 ?
> If yes, do you have any docs about it ?

I think it is NOT possible without INT 10.
Have a look at Ralph Brown's Interrupt list:
http://www.cs.cmu.edu/afs/cs.cmu.edu/user/ralf/pub/WWW/files.html
and look at INT 10/AX=4F0A.
> Is the int 0x10 VESA code specific to each graphic card ?

No.
> I've got a problem with DMA programming, here's my source :
>
> (....)
> I use it to transfer a sector from the floppy disk. Do you see anything
> wrong in this code ?
> The transfer is not made by the floppy, and i don't know why...
> I don't know if it's in the DMA programming, or in the floppy driver
> ..............

I'm not sure, but I think the floppy don't support 
DMA and it is as default disabled by the floppy
controller.
> Help !
>
> Thanks,
>
> Thomas, from france

Marcus
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VESA & DMA

[Petazzoni Thomas]

> > Can we setup a VESA 2 (not VESA 3 !) configuration (select video
> >
> > mode, and everything) without making a int 0x10 ? We're programming a
> > protected mode OS, and switching to VM86 sucks. I know it's possible
> > with VESA 3, but with VESA 2 ?
> > If yes, do you have any docs about it ?
>
> I think it is NOT possible without INT 10.
> Have a look at Ralph Brown's Interrupt list:
> http://www.cs.cmu.edu/afs/cs.cmu.edu/user/ralf/pub/WWW/files.html
> and look at INT 10/AX=4F0A.
> > Is the int 0x10 VESA code specific to each graphic card ?
>
> No.

i can get the address of the 0x10 code in the IVT in real mode, right. so i get
this code, unassemble it to find the good functions to see how they work ....
and that's how to program VESA without int 0x10.

yours answers are strange !!!!

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