nanogui: Testing the 4 planes Vga Driver - Bare hardware
Subject:
RE: Testing the 4 planes Vga Driver - Bare hardware
From:
Rosimildo daSilva ####@####.####
Date:
6 Oct 1999 01:05:27 -0000
Message-Id: <199910060058.RAA21350@www2.xoommail.com>
> : The code runs in protected mode and it does not have BIOS access.
>
> The protected mode is no problem, since the vgaplan4 driver
> runs under Linux ELKS. But the scr_bios wrapper requires that the
> bios be called to init and deinit the graphics card. I never wrote
> the routines to init the vga card, since they vary so much from
> card to card. I have some routines that you could fiddle with
> that attempt to program the vga hardware directly for initialization, if you want.
> They are in David Bell's original mini-x code, in a file called ega.s, or something
> like it. See ftp://microwindows.censoft.com/pub/mini-x get the file mini-x-new.tar.gz.
>
I linked vgainit.c, and it seems to have the routines there.
My initial problem was that I thought outp() and outb() had the
same signature. :-).
> It would be fairly easy to write a #ifdef TEST main() routine
> for the video driver. Perhaps you could do it for the working linux screen
> driver, and then integrate Bell's ega startup code. If you send me the changes,
> I'll add them to the release, and test your test code with other drivers.
>
I'll try as soon as I get something testable.
> Like I mentioned, the scr_bios wrapper around vgaplan.c needs to be
> slightly rewritten. If you set #define HWINIT 1, then you can just write two
> replacement bios routiones, ega_hwinit(), and ega_hwterm(). Other than that,
> the driver is used under the ELKS build currently.
>
Ok, I guess I found the problem with the initialization.
I had defined outp() and outb() with the same signature.
Now, I need to understand how should I setup
rom_char_addr. My target does not have BIOS.
I have tried this:
extern FONT font_rom8x16; /* font generated with convrom.c */
FONT *font_ptr = &font_rom8x16;
rom_char_addr = (FARADDR)( font_ptr->bits );
When I execute the code, the result does not look correct.
Do I need to use the convrom.exe utility ?
Any hints ?
Rosimildo.
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