A few issues remain. For some reason or other, a warm reset (reboot from Linux) leaves the VGA is a scrambled state. But a hardware reset or cold start is fine. I could not get the current ide to work, so I backed up to the following revisions on ide:
$Id: ide.c,v 1.5 2002/11/11 21:30:45 pyro9 Exp $
$Id: ide.h,v 1.3 2002/12/16 17:57:45 rminnich Exp $
(since my config loads from hda1). It sure appears to me that the repository code for ide is broken, but I did not have time to pin it down.
The main issues preventing the vga from being done much sooner are basically a bunch of extended registers that Via uses, that do not initialize to a useable condition on power-on. Takes a while to find which ones, there are hundreds.
I would not want to do this without a datasheet, so I don't have much hope for the CLE266 unless the VGA is identical or we get a datasheet for it.
-Steve
diff --exclude-from exclude_epia --recursive --unified -P
freebios/src/mainboard/via/epia/Config
freebios_epia_works/src/mainboard/via/epia/Config
--- freebios/src/mainboard/via/epia/Config Sun Sep 7 18:22:01 2003
+++ freebios_epia_works/src/mainboard/via/epia/Config Sun Sep 7 17:24:15 2003
@@ -6,6 +6,7 @@
mainboardinit cpu/i386/reset16.inc
ldscript cpu/i386/reset16.lds
+option VGA_HARDWARE_FIXUP=1
mainboardinit superio/via/vt8231/setup_ethernet.inc
mainboardinit superio/via/vt8231/setup_serial.inc
mainboardinit pc80/serial.inc
diff --exclude-from exclude_epia --recursive --unified -P
freebios/src/mainboard/via/epia/mainboard.c
freebios_epia_works/src/mainboard/via/epia/mainboard.c
--- freebios/src/mainboard/via/epia/mainboard.c Sun Sep 7 18:22:01 2003
+++ freebios_epia_works/src/mainboard/via/epia/mainboard.c Sun Sep 7 18:34:15
2003
@@ -2,9 +2,18 @@
#include <pci.h>
#include <pci_ids.h>
#include <cpu/p5/io.h>
+#include <pc80/vga.h>
#include <types.h>
+void northbridge_fixup();
+void southbridge_fixup();
+void video_init();
+void nvram_on();
+void keyboard_on();
+void pci_assign_irqs(unsigned bus, unsigned slot, const unsigned char pIntAtoD[4]);
+
+
static const unsigned char southbridgeIrqs[4] = { 11, 5, 10, 12 };
static const unsigned char enetIrqs[4] = { 11, 5, 10, 12 };
static const unsigned char slotIrqs[4] = { 5, 10, 12, 11 };
@@ -65,6 +74,15 @@
nvram_on();
keyboard_on();
+ southbridge_fixup();
+
+#ifdef VIDEO_CONSOLE
+ vga_hardware_fixup();
+ // this has to be done here due to pci not always being up
+ // earlier and pci resources are not ready
+ video_init();
+#endif
+
pci_routing_fixup();
}
diff --exclude-from exclude_epia --recursive --unified -P
freebios/src/northbridge/via/vt8601/Config
freebios_epia_works/src/northbridge/via/vt8601/Config
--- freebios/src/northbridge/via/vt8601/Config Sun Sep 7 18:22:01 2003
+++ freebios_epia_works/src/northbridge/via/vt8601/Config Fri Sep 5 10:27:10
2003
@@ -1 +1,2 @@
object northbridge.o
+object via_vga.o VIDEO_CONSOLE
diff --exclude-from exclude_epia --recursive --unified -P
freebios/src/northbridge/via/vt8601/vgainit.inc
freebios_epia_works/src/northbridge/via/vt8601/vgainit.inc
--- freebios/src/northbridge/via/vt8601/vgainit.inc Sun Sep 7 18:29:59 2003
+++ freebios_epia_works/src/northbridge/via/vt8601/vgainit.inc Sun Sep 7 18:40:42
2003
@@ -21,3 +21,32 @@
#endif
+#if VIDEO_CONSOLE
+
+/*
+ * by Steve M. Gehlbach, Ph.D.
+ * steve @ kesa . com
+ *
+ * 9/7/03 smg
+ * minor chipset settings for vga
+ * more work needed for init, since reboot
+ * from linux has problems (hdwr reset okay)
+ *
+ */
+ // set shadow ram to award settings
+
+ CS_WRITE($0x61, $0x2a)
+ CS_WRITE($0x62, $0x00)
+ CS_WRITE($0x63, $0x20)
+
+ // turn off GA
+
+ CS_WRITE($0x88,$0x00)
+
+ // enable vga, fb
+
+ CS_WRITE($0xF9,$0x42)
+ CS_WRITE($0xFB,$0xb0)
+
+#endif
+
diff --exclude-from exclude_epia --recursive --unified -P
freebios/src/northbridge/via/vt8601/via_vga.c
freebios_epia_works/src/northbridge/via/vt8601/via_vga.c
--- freebios/src/northbridge/via/vt8601/via_vga.c Wed Dec 31 16:00:00 1969
+++ freebios_epia_works/src/northbridge/via/vt8601/via_vga.c Sun Sep 7 16:11:37
2003
@@ -0,0 +1,168 @@
+/*
+ *
+ * By
+ * Steve M. Gehlbach <steve @ kesa . com>
+ *
+ * vga initialization specific for
+ * via vt8601 chipset
+ *
+ * The font load code follows technique used
+ * in the tiara project, which came from
+ * the Universal Talkware Boot Loader,
+ * http://www.talkware.net.
+ */
+
+#include <video_subr.h>
+#include <subr.h>
+#include <string.h>
+#include <pc80/vga.h>
+#include <cpu/p5/io.h>
+#include <subr.h>
+#include <printk.h>
+
+#define VGA_FONT_BASE 0xa0000;
+#define VGA_GRAFIX_BASE 0xa0000;
+#define CHAR_HEIGHT 16
+
+// splash_done is a global to avoid putting up splash screen twice.
+// Kind of a hack, but the problem is that the vga pci resources
+// are sometimes ready early, sort of, and the initial call to
+// vga_hardware_fixup puts up the splash screen; then a later call
+// to it from hardware_main does it again; but this does not always
+// happen, sometimes it fails the first call. It is either a timing or initialization
+// problem that needs to be tracked down and fixed. Note that both calls (fixup) are
necessary
+// since some vga boards are not ready early, but some are, and of course, the epia
is sometimes ready
+// and sometimes not ready.
+//
+int splash_done = 0;
+
+extern unsigned char fontdata_8x16[];
+extern void beep (int msec);
+extern void udelay (int usec);
+
+// The screeninfo structure is in pc80/vga_load_regs.c and has the vga
+// parameters for screen size etc.
+// This is _not_ the struct used in the zero_page
+// for linux init. It is only used for vga init.
+extern struct screeninfo vga_settings;
+
+// prototypes
+int vga_decode_var(struct screeninfo *var, struct vga_par *par);
+int vga_set_regs(struct vga_par *par);
+
+
+void vga_set_amode(void);
+void vga_set_gmode(void);
+void delay(int secs);
+void mdelay(int msecs);
+void vga_font_load(unsigned char *vidmem, unsigned char *font, int height, int
num_chars);
+int vga_load_pcx( char * pcx_file, int pcx_file_length);
+
+void vt8601_video_init(void) {
+ int res;
+ u8 byte;
+ struct vga_par vga_params;
+
+
+ // convert the general vga parameters in screeninfo structure
+ // to actual vga register settings
+
+ res = vga_decode_var(&vga_settings, &vga_params);
+ if ( res < 0 ) { post_code (0xFD); } //no error return for now
+
+ // enable vga system
+ outb(0x01, 0x3c3); // enable VGA
+
+ // write the registers
+ res = vga_set_regs( &vga_params );
+ if ( res < 0 ) { post_code(0xFE); } //no error return for now
+ byte = inb(MIS_R); // get 3c2 value by reading 3cc
+ outb(byte & ~0xc,MIS_W); // clear last bits to set 25Mhz clock
+
+ // enable epia extended regs
+ write_seq(0x92,0x11);
+
+ // setup the video clocks
+ // -follows award settings
+ // not all of these are necessary
+ write_seq(0xbd,0x18);
+ write_seq(0xcc,0x19);
+ write_seq(0xff,0x1a);
+ write_seq(0xff,0x1b);
+ write_seq(0x46,0x1c);
+ write_seq(0xbf,0x1d);
+ write_seq(0xff,0x1e);
+ write_seq(0xcc,0x1f);
+ write_seq(0x04,0x20);
+ write_seq(0x4f,0x24);
+
+ // setup extended crtc regs
+ // -follows award settings
+ // not all of these are necessary
+ write_crtc(0x64,0x1f);
+ write_crtc(0x20,0x20);
+ write_crtc(0x0,0x21);
+ write_crtc(0x7,0x25);
+ write_crtc(0x4,0x29);
+ write_crtc(0x1f,0x2a);
+ write_crtc(0x0,0x2b);
+ write_crtc(0xdf,0x2f);
+ write_crtc(0x10,0x38);
+
+
+}
+
+#ifdef VGA_HARDWARE_FIXUP
+void vga_hardware_fixup(void) {
+ u8 *font_mem, *vga_mem, *pcx_file;
+ int *file_size;
+
+#ifdef PCX_FILE_LOCATION
+ pcx_file = (u8 *) PCX_FILE_LOCATION;
+#else
+ pcx_file = (u8 *) 0xfffe0000;
+#endif
+ file_size = (int *) pcx_file;
+
+ vga_mem = (u8 *) VGA_GRAFIX_BASE;
+ font_mem = (u8 *) VGA_FONT_BASE;
+
+ outb(0x01, 0x3b8); // enable VGA
+ outb(0x01, 0x3c3); // enable VGA
+ outb(0x08, 0x46e8); // enable VGA (does not appear to be used)
+
+ if (inb(0x3c3) != 1) {
+ printk_info("VGA not ready yet.\n");
+ return;
+ }
+ printk_info("Initializing vt8601 vga...");
+ post_code(0xa0);
+
+ vt8601_video_init();
+
+ printk_info("done.\n");
+
+#ifdef VIDEO_SHOW_LOGO
+ if (!splash_done) {
+ printk_debug("Setting graphics mode...\n");
+ vga_set_gmode(); // set graphics mode
+
+ //
+ // the pcx_file is in flash at an address set
+ // in the config file with PCX_FILE_LOCATION
+ // the length of the file is at offset 0, file starts at 4
+ //
+
+ printk_debug("pcx file at %x length %d\n",&pcx_file[4], *file_size);
+ vga_load_pcx( &pcx_file[4], *file_size);
+ delay(VIDEO_SHOW_LOGO);
+
+#endif
+ vga_set_amode();
+ vga_font_load(font_mem,fontdata_8x16,CHAR_HEIGHT,256);
+ splash_done++; // mark done
+ printk_debug("alpha mode set.\n");
+ post_code(0xa1);
+ }
+}
+#endif
diff --exclude-from exclude_epia --recursive --unified -P
freebios/util/config/epia800.config freebios_epia_works/util/config/epia800.config
--- freebios/util/config/epia800.config Wed Dec 31 16:00:00 1969
+++ freebios_epia_works/util/config/epia800.config Sun Sep 7 16:48:42 2003
@@ -0,0 +1,63 @@
+#
+# LinuxBIOS config file for: VIA epia mini-itx
+#
+
+target /usr/src/epia
+
+# via epia
+mainboard via/epia
+biosbase 0xffff0000
+
+# setup delay using TSC
+option CONFIG_UDELAY_TSC=1
+
+# Enable Serial Console for debugging
+option CONFIG_COMPRESS=0
+option SERIAL_CONSOLE=1
+option VIDEO_CONSOLE=1
+option TTYS0_BAUD=115200
+
+# For printk_debug, set level to 8
+# for printk_info, set level to 7
+#option DEFAULT_CONSOLE_LOGLEVEL=8
+#option DEFAULT_CONSOLE_LOGLEVEL=7
+option DEFAULT_CONSOLE_LOGLEVEL=6
+
+#option DEBUG=1
+
+option BOOT_IDE=1
+option IDE_BOOT_DRIVE=0
+#need to know size of partition table for ide
+#option ONE_TRACK=32
+option ONE_TRACK=63
+
+
+# the logo is displayed for VIDEO_SHOW_LOGO seconds.
+# Need to have to have a 128k rom since the logo image is at the
+# beginning (0xfffe0000)
+option VIDEO_SHOW_LOGO=10
+option ROM_IMAGE_SIZE=131072
+option PCX_FILE_LOCATION=0xfffe0000
+
+
+# Use 256KB Standard Flash as Normal BIOS
+option RAMTEST=1
+
+linux /usr/src/linux
+commandline root=/dev/hda2 ro console=ttyS0,115200n8 console=tty1
+
+#
+# these actions put the pcx image file on the front of the bios.
+# the image size is placed in the first 4 bytes then the pcx file
+# important that ROM_IMAGE_SIZE be set to 128K or larger.
+# The logo file is called linuxbioslogo.pcx and is by default located at
+# src/pc80/linuxbioslogo.pcx.
+# Change the variable LOGOFILE below if you want to use your own file.
+# See the file src/pc80/vga_load_pcx.c for details on the file format.
+#
+option LOGOFILE=$(TOP)/src/pc80/linuxbioslogo.pcx
+addaction linuxbios.rom dd if=$(LOGOFILE) of=linuxbios.rom bs=1 seek=4 conv=notrunc;
+addaction linuxbios.rom perl -e '@a=stat "$(LOGOFILE)";$$a=pack("L",$$a[7]); print
$$a' | dd of=linuxbios.rom bs=1 conv=notrunc
+
+# copy to home dir where flash programmer can reach.
+addaction linuxbios.rom /bin/cp -f linuxbios.rom
$(HOME)/cti/software/bios/exp/linuxbios_epia.bin
