Since I have been having no luck with getting the Framebuffer
option to work on my system, I have come to the conclusion
that I have a VESA 1.2 BIOS (I do have a S3Virge). So I did some
searching and found this internet site with the following info.
---------------------------------------------------------------------
Framebuffer HOWTO
Alex Buell, [EMAIL PROTECTED]
v1.1, 22 July 1999
Alternatively, you may be able to download kernel patches to allow
your VESA 1.2 card to work with the VESA framebuffer driver. For
example, there are patches for use with older S3 boards (such as S3
Trio, S3 Virge) that supports VESA 1.2. For these cards, you can pick
up patches from
ftp://ccssu.crimea.ua/pub/linux/kernel/v2.2/unofficial/s3new.diff.gz)
----------------------------------------------------------------------
I downloaded the file and tried to do the patch but am having no luck.
I am posting it here for others to look at that may have a better
understanding of how the patching process works. I read the man page but
I am still not really sure as to how this is done. It appears that there
are 3 files patched by this file??? Is this correct and can someone tell
me if I am on a wild goose chase or not. (:
Please forgive me for this long post and taking up so much band width.
-----------------------------------------------------------------------
THE patch file....
--- linux/arch/i386/boot/video.S.orig Sun Oct 25 13:46:40 1998
+++ linux/arch/i386/boot/video.S Sat Feb 13 18:01:49 1999
@@ -554,13 +554,22 @@
cmp al,#0x09
jz setvesa ! this is a text mode
+#ifdef CONFIG_FB_S3CARD
+!
+! removed the check for linear frame buffer as
+! we're going to try and turn it on ourselves
+!
+#else
mov al,(di) ! Check capabilities.
and al,#0x99
cmp al,#0x99
jnz _setbad ! to bad, no linear frame buffer
+#endif
sub bh,#VIDEO_FIRST_VESA>>8
+#ifndef CONFIG_FB_S3CARD
or bx,#0x4000 ! want use linear frame buffer
+#endif
mov ax,#0x4f02 ! VESA BIOS mode set call
int 0x10
cmp ax,#0x004f ! AL=4f if implemented, AH=0 if OK
--- linux/drivers/video/Config.in.orig Fri Jan 22 21:56:07 1999
+++ linux/drivers/video/Config.in Sat Feb 13 18:09:51 1999
@@ -64,6 +64,11 @@
bool 'VESA VGA graphics console' CONFIG_FB_VESA
define_bool CONFIG_VIDEO_SELECT y
fi
+ if [ "$CONFIG_FB_VESA" = "y" ]; then
+ if [ "$CONFIG_PCI" != "n" ]; then
+ bool 'S3 display support' CONFIG_FB_S3CARD
+ fi
+ fi
if [ "$CONFIG_EXPERIMENTAL" = "y" ]; then
if [ "$CONFIG_PCI" != "n" ]; then
tristate 'Matrox acceleration' CONFIG_FB_MATROX
--- linux/drivers/video/vesafb.c.orig Fri Nov 27 20:24:31 1998
+++ linux/drivers/video/vesafb.c Sat Feb 13 18:05:20 1999
@@ -21,6 +21,7 @@
#include <linux/selection.h>
#include <linux/ioport.h>
#include <linux/init.h>
+#include <linux/pci.h>
#include <linux/config.h>
#include <asm/io.h>
@@ -32,8 +33,12 @@
#include <video/fbcon-cfb24.h>
#include <video/fbcon-cfb32.h>
-#define dac_reg (0x3c8)
-#define dac_val (0x3c9)
+#define dac_reg (0x3c8)
+#define dac_val (0x3c9)
+#ifdef CONFIG_FB_S3CARD
+#define crtc_adr (0x3d4)
+#define crtc_val (0x3d5)
+#endif
/* --------------------------------------------------------------------- */
@@ -521,6 +526,82 @@
if (screen_info.orig_video_isVGA != VIDEO_TYPE_VLFB)
return;
+#ifdef CONFIG_FB_S3CARD
+ do
+ {
+ // ----------------------------------------------
+ // try and enable linear frame buffer on S3 cards
+ // ----------------------------------------------
+
+ struct pci_dev *dev;
+ u8 tmp;
+
+ // find S3 on PCI bus
+
+ for(dev = pci_devices; dev && (dev->vendor != PCI_VENDOR_ID_S3 ||
+ dev->class >> 8 != PCI_CLASS_DISPLAY_VGA); dev
+= dev->next);
+ if(!dev)
+ {
+ break;
+ }
+
+ // unlock S3 registers
+
+ outb_p(0x38, crtc_adr); outb_p(0x48, crtc_val);
+ outb_p(0x39, crtc_adr); outb_p(0xa5, crtc_val);
+
+ // check that CR47 is read/write
+
+ outb_p(0x47, crtc_adr); outb_p(0xff, crtc_val);
+ tmp = inb_p(crtc_val);
+ outb_p(0x00, crtc_val);
+ if(tmp != 0xff || inb_p(crtc_val))
+ {
+ // lock S3 registers
+
+ outb_p(0x39, crtc_adr); outb_p(0x5a, crtc_val);
+ outb_p(0x38, crtc_adr); outb_p(0x00, crtc_val);
+
+ break;
+ }
+
+ printk("vesafb: enabling S3 linear frame buffer\n");
+
+ // enable enhanced register access
+
+ outb_p(0x40, crtc_adr); outb_p(inb_p(crtc_val) | 1, crtc_val);
+
+ // enable enhanced functions
+
+ outb_p(inb_p(0x4ae8) | 1, 0x4ae8);
+
+ // enable enhanced mode memory mapping
+
+ outb_p(0x31, crtc_adr); outb_p(inb_p(crtc_val) | 8, crtc_val);
+
+ // enable linear frame buffer and set address window to max
+
+ outb_p(0x58, crtc_adr); outb_p(inb_p(crtc_val) | 0x13, crtc_val);
+
+ // disabled enhanced register access
+
+ outb_p(0x40, crtc_adr); outb_p(inb_p(crtc_val) & ~1, crtc_val);
+
+ // lock S3 registers
+
+ outb_p(0x39, crtc_adr); outb_p(0x5a, crtc_val);
+ outb_p(0x38, crtc_adr); outb_p(0x00, crtc_val);
+
+ // save base address
+
+ screen_info.lfb_base = dev->base_address[0] &
+PCI_BASE_ADDRESS_MEM_MASK;
+
+ // disable fancy stuff
+
+ screen_info.vesapm_seg = 0;
+ }
+ while(0);
+#endif
video_base = (char*)screen_info.lfb_base;
video_bpp = screen_info.lfb_depth;
