From: Mihai Moise (mmoise@giref.ulaval.ca)
Date: Tue 03 Jul 2001 - 15:38:17 IDT
also sprach Matan Ziv-Av:
> So does the driver work, after you replaced the apertures' meaning?
Ay Caramba! There is a problem with the combination
vga_setlinearaddressing and vga_getgraphmem. I think the linear array is
never memory mapped, and vga_getgraphmem returns the address of the VGA
aperture.
> I can see two more ways to distinguish:
> - Trying to write an address that is read only in mmio, and see if it
> changes.
> - Checking the 1064 revision. (But I don't which revisions have which
> mapping).
I have done the former. Attached is a patch to svgalib-1.9.10. It works
on my friend's card. Come to think of it, on some microprocessors a long
int will be 64 bits, so buf should be just int. You may remove the debug
messages. Register 1e10h is the bus FIFO status. It is read-only :-).
While I am at it, how are addresses kept on the PCI bus on systems which
have 64 bits physical addresses? And can someone who has the PCI
specifications send me a copy by e-mail?
Mihai
diff -urN svgalib-1.9.10/src/g400.c svgalib_mihai/src/g400.c
--- svgalib-1.9.10/src/g400.c Tue Jul 3 08:25:01 2001
+++ svgalib_mihai/src/g400.c Tue Jul 3 08:38:21 2001
@@ -790,8 +790,7 @@
static int g400_init(int force, int par1, int par2)
{
- unsigned long buf[64];
- int found=0;
+ unsigned int found=0, buf[64];
int pci_id;
char *ids[]={"Mystique", "G100", "G200", "G400", "G450"};
@@ -803,7 +802,7 @@
found=__svgalib_pci_find_vendor_vga_pos(VENDOR_ID,buf,0);
- if(found==-1) {
+ if(!found) {
printf("Error: Must use Matrox driver, but no card found\n");
exit(1);
}
@@ -828,12 +827,30 @@
default:
id = ID_G100;
}
-
- g400_linear_base = buf[4]&0xffffff00;
- g400_mmio_base = buf[5]&0xffffff00;
-
+ printf("linear base: %x\n", g400_linear_base = buf[4]&0xffffff00);
+ printf("mmio base: %x\n", g400_mmio_base = buf[5]&0xffffff00);
__svgalib_vgammbase=mmap(0,0x1000,PROT_READ|PROT_WRITE,MAP_SHARED,__svgalib_mem_fd,g400_mmio_base+0x1000) + 0xc00;
+ if(id == ID_1064){
+ /* For some mystique boards, the primary aperture is
+ for memory mapped registers. We detect this by writing
+ and reading from the bus FIFO status register, which is
+ read only and the upper 21 bits read 0.
+ -- Mihai */
+ *((int *)(__svgalib_vgammbase + 0x210)) = 0x1234;
+ if(*((int *) (__svgalib_vgammbase + 0x210)) == 0x1234){
+ printf("Changing configuration\n");
+ munmap(__svgalib_vgammbase - 0xc00, 0x1000);
+ g400_linear_base = buf[4]&0xffffff00;
+ g400_mmio_base = buf[5]&0xffffff00;
+ __svgalib_vgammbase=mmap(0,0x1000,
+ PROT_READ|PROT_WRITE,
+ MAP_SHARED,
+ __svgalib_mem_fd,
+ g400_mmio_base+0x1000) + 0xc00;
+ }
+ }
__svgalib_mm_io_mapio();
+
__svgalib_inpal=inpal;
__svgalib_outpal=outpal;
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