Thanks for the info. I did not know this. Is this documented somewhere ?
I've been busy lately, so updates on the VGA Bios have stalled.
I will get back on this real soon.
Christophe
En r�ponse � Bart Oldeman <[EMAIL PROTECTED]>:
> FYI a while ago I wrote a small program that scans /dev/mem for VGA
> BIOSes: bytes 0,1 must be 0x55,0xAA and c[2] contains the size / 512.
>
> Moreover, at offset 0x1e one should read "IBM".
> This is true for the Elpin BIOS, but not true for Christophe Bothamy's
> LGPL VGA bios.
>
> /*
> * As some people were not that sure about the location and size of
> their
> * video bios (this is necessary for graphics on console configuration),
> * I've written this small automatic detection program.
> * You must (normally!) be root to execute it, as it needs read access
> * to /dev/mem.
> *
> */
>
> #include <stdio.h>
>
> int main ()
> {
> FILE *f;
> int i;
> unsigned char c[0x21];
>
> f = fopen("/dev/mem","r");
> if (f==NULL) {
> printf("You must have read access to /dev/mem to execute this.\n");
> return 1;
> }
> for (i = 0xc0000; i < 0xf0000; i += 0x800) {
> fseek(f, i, SEEK_SET);
> fread(c, 0x21, 1, f);
> if (c[0]==0x55 && c[1]==0xaa &&
> c[0x1e]=='I' && c[0x1f]=='B' && c[0x20]=='M') {
> printf("$_vbios_seg = (0x%x)\n", i>>4);
> printf("$_vbios_size = (0x%x)\n", c[2]*0x200);
> }
> }
> fclose(f);
> return 0;
> }
>
> ... Lots deleted ...
>
> Bart
>
>
>
