[OpenBIOS] Some VGA set up that seems to work on a 440BX with a PCI (Rage II I card)

[Wallace I. Kroeker]

Hello,

Ron was asking about this and here is the code snippets that managed
to get things working for me.
    Of course, I had the interrupt incorrect as it is int 10h ... sorry.

The following goes in boot/boot16/start.asm  (I put it right after
the FPU reset):
    ;;*************
    ;; set up the VGA into text mode
    mov ah, 0x00
    mov al, 0x07	;  a MDA type mode
    int 10h

PAUSE  ;  delays are always good when you are counting on other
devices to set up

;; load a character set ... the card usually have a few predefined
    mov  ah, 0x11
    mov   al,0x01	; 8x14
    ;; *** mov al, 0x02 ; this is for 8x8
    mov bl, 0x00	;  load it into a character table (0 or 1) in this
case 1
    int 10h

PAUSE

;;  Activate the character set 0
    mov ah, 0x11
    mov al, 0x03
    mov bl, 0x00	;; activate character table 0
    int 10h

PAUSE

;;; Just for a test you can try to output a character now
    ;; mov ah, 0x0A
    ;; mov al,  0x55	; a character
    ;; mov bh, 0x00	; video page number
    ;; mov bl,  0x00 	; foreground color of character for graphics
mode
    ;; mov cx, 0x01 	; repeat factor

;;**********

The following changes need to be made in the

VIDEO.H

#define VIDEO_MDA 1
    #define VIDEO_CGA 2
    #define VIDEO_EGA 3
    #define VIDEO_VGA 4

CONSOLE.C in the console_init:

have_video = video_init( VIDEO_VGA );

VGA.H

// #define VGA_FBBASE 0xb8000
    #define VGA_FBBASE 0xb0000	// this is the MDA area

Hope this helps getting things going for you.

Wallace
> -----Original Message-----
> From:	Ronald G. Minnich [SMTP:[e-mail]]
> Sent:	Tuesday, February 15, 2000 7:18 PM
> To:	[e-mail]
> Subject:	[OpenBIOS] success on l440gx+ ram
>
> I forgot to put a 0x17 in reg 0x76 after the mode set command. Sheesh.
>
> dram is now working fine. I am actually in protected mode in the 32-bit
> openbios startup, getting ready to gunzip linux and jump to it.
>
> Now the trick is to figure out why I have no display :-)
>
> All I want for now is a vga-compatible thing, very limited in scope. So I
> want the absolute minimum hardware only. Any hints would be welcome.
>
> ron
>
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