util/flashrom/chipset_enable.c - coreboot - Gitiles

 /*
  *   flash rom utility: enable flash writes
  *
  *   Copyright (C) 2000 Silicon Integrated System Corporation
  *   Copyright (C) 2005-2007 coresystems GmbH <stepan@coresystems.de>
  *   Copyright (C) 2006 Uwe Hermann <uwe@hermann-uwe.de>
  *
  *   This program is free software; you can redistribute it and/or
  *   modify it under the terms of the GNU General Public License
  *   version 2
  *
  */

 #include <stdio.h>
 #include <pci/pci.h>
 #include <stdlib.h>

 #include "flash.h"
 #include "debug.h"

 static int enable_flash_sis630(struct pci_dev *dev, char *name)
 {
 	char b;

 	/* Enable 0xFFF8000~0xFFFF0000 decoding on SiS 540/630 */
 	outl(0x80000840, 0x0cf8);
 	b = inb(0x0cfc) | 0x0b;
 	outb(b, 0xcfc);
 	/* Flash write enable on SiS 540/630 */
 	outl(0x80000845, 0x0cf8);
 	b = inb(0x0cfd) | 0x40;
 	outb(b, 0xcfd);

 	/* The same thing on SiS 950 SuperIO side */
 	outb(0x87, 0x2e);
 	outb(0x01, 0x2e);
 	outb(0x55, 0x2e);
 	outb(0x55, 0x2e);

 	if (inb(0x2f) != 0x87) {
 		outb(0x87, 0x4e);
 		outb(0x01, 0x4e);
 		outb(0x55, 0x4e);
 		outb(0xaa, 0x4e);
 		if (inb(0x4f) != 0x87) {
 			printf("Can not access SiS 950\n");
 			return -1;
 		}
 		outb(0x24, 0x4e);
 		b = inb(0x4f) | 0xfc;
 		outb(0x24, 0x4e);
 		outb(b, 0x4f);
 		outb(0x02, 0x4e);
 		outb(0x02, 0x4f);
 	}

 	outb(0x24, 0x2e);
 	printf("2f is %#x\n", inb(0x2f));
 	b = inb(0x2f) | 0xfc;
 	outb(0x24, 0x2e);
 	outb(b, 0x2f);

 	outb(0x02, 0x2e);
 	outb(0x02, 0x2f);

 	return 0;
 }

 /* Datasheet:
  *   - Name: 82371AB PCI-TO-ISA / IDE XCELERATOR (PIIX4)
  *   - URL: http://www.intel.com/design/intarch/datashts/290562.htm
  *   - PDF: http://www.intel.com/design/intarch/datashts/29056201.pdf
  *   - Order Number: 290562-001
  */
 static int enable_flash_piix4(struct pci_dev *dev, char *name)
 {
 	uint16_t old, new;
 	uint16_t xbcs = 0x4e;	/* X-Bus Chip Select register. */

 	old = pci_read_word(dev, xbcs);

 	/* Set bit 9: 1-Meg Extended BIOS Enable (PCI master accesses to
 	 *            FFF00000-FFF7FFFF are forwarded to ISA).
 	 * Set bit 7: Extended BIOS Enable (PCI master accesses to
 	 *            FFF80000-FFFDFFFF are forwarded to ISA).
 	 * Set bit 6: Lower BIOS Enable (PCI master, or ISA master accesses to
 	 *            the lower 64-Kbyte BIOS block (E0000-EFFFF) at the top
 	 *            of 1 Mbyte, or the aliases at the top of 4 Gbyte
 	 *            (FFFE0000-FFFEFFFF) result in the generation of BIOSCS#.
 	 * Note: Accesses to FFFF0000-FFFFFFFF are always forwarded to ISA.
 	 * Set bit 2: BIOSCS# Write Enable (1=enable, 0=disable).
 	 */
 	new = old | 0x2c4;

 	if (new == old)
 		return 0;

 	pci_write_word(dev, xbcs, new);

 	if (pci_read_word(dev, xbcs) != new) {
 		printf("tried to set 0x%x to 0x%x on %s failed (WARNING ONLY)\n", xbcs, new, name);
 		return -1;
 	}
 	return 0;
 }

 static int enable_flash_ich(struct pci_dev *dev, char *name, int bios_cntl)
 {
 	/* register 4e.b gets or'ed with one */
 	uint8_t old, new;

 	/* if it fails, it fails. There are so many variations of broken mobos
 	 * that it is hard to argue that we should quit at this point.
 	 */

 	/* Note: the ICH0-ICH5 BIOS_CNTL register is actually 16 bit wide, but
 	 * just treating it as 8 bit wide seems to work fine in practice.
 	 */

 	/* see ie. page 375 of "Intel ICH7 External Design Specification"
 	 * http://download.intel.com/design/chipsets/datashts/30701302.pdf
 	 */

 	old = pci_read_byte(dev, bios_cntl);

 	new = old | 1;

 	if (new == old)
 		return 0;

 	pci_write_byte(dev, bios_cntl, new);

 	if (pci_read_byte(dev, bios_cntl) != new) {
 		printf("tried to set 0x%x to 0x%x on %s failed (WARNING ONLY)\n", bios_cntl, new, name);
 		return -1;
 	}
 	return 0;
 }

 static int enable_flash_ich_4e(struct pci_dev *dev, char *name)
 {
 	return enable_flash_ich(dev, name, 0x4e);
 }

 static int enable_flash_ich_dc(struct pci_dev *dev, char *name)
 {
 	return enable_flash_ich(dev, name, 0xdc);
 }

 /*
  *
  */
 static int enable_flash_vt823x(struct pci_dev *dev, char *name)
 {
 	uint8_t val;

 	/* ROM Write enable */
 	val = pci_read_byte(dev, 0x40);
 	val |= 0x10;
 	pci_write_byte(dev, 0x40, val);

 	if (pci_read_byte(dev, 0x40) != val) {
 		printf("\nWARNING: Failed to enable ROM Write on \"%s\"\n",
 		       name);
 		return -1;
 	}

 	return 0;
 }

 static int enable_flash_cs5530(struct pci_dev *dev, char *name)
 {
 	uint8_t new;

 	pci_write_byte(dev, 0x52, 0xee);

 	new = pci_read_byte(dev, 0x52);

 	if (new != 0xee) {
 		printf("tried to set register 0x%x to 0x%x on %s failed (WARNING ONLY)\n", 0x52, new, name);
 		return -1;
 	}

 	new = pci_read_byte(dev, 0x5b) | 0x20;
 	pci_write_byte(dev, 0x5b, new);

 	return 0;
 }

 static int enable_flash_sc1100(struct pci_dev *dev, char *name)
 {
 	uint8_t new;

 	pci_write_byte(dev, 0x52, 0xee);

 	new = pci_read_byte(dev, 0x52);

 	if (new != 0xee) {
 		printf("tried to set register 0x%x to 0x%x on %s failed (WARNING ONLY)\n", 0x52, new, name);
 		return -1;
 	}
 	return 0;
 }

 static int enable_flash_sis5595(struct pci_dev *dev, char *name)
 {
 	uint8_t new, newer;

 	new = pci_read_byte(dev, 0x45);

 	/* clear bit 5 */
 	new &= (~0x20);
 	/* set bit 2 */
 	new |= 0x4;

 	pci_write_byte(dev, 0x45, new);

 	newer = pci_read_byte(dev, 0x45);
 	if (newer != new) {
 		printf("tried to set register 0x%x to 0x%x on %s failed (WARNING ONLY)\n", 0x45, new, name);
 		printf("Stuck at 0x%x\n", newer);
 		return -1;
 	}
 	return 0;
 }

 static int enable_flash_amd8111(struct pci_dev *dev, char *name)
 {
 	/* register 4e.b gets or'ed with one */
 	uint8_t old, new;

 	/* if it fails, it fails. There are so many variations of broken mobos
 	 * that it is hard to argue that we should quit at this point.
 	 */

 	/* enable decoding at 0xffb00000 to 0xffffffff */
 	old = pci_read_byte(dev, 0x43);
 	new = old | 0xC0;
 	if (new != old) {
 		pci_write_byte(dev, 0x43, new);
 		if (pci_read_byte(dev, 0x43) != new) {
 			printf("tried to set 0x%x to 0x%x on %s failed (WARNING ONLY)\n", 0x43, new, name);
 		}
 	}

 	old = pci_read_byte(dev, 0x40);
 	new = old | 0x01;
 	if (new == old)
 		return 0;
 	pci_write_byte(dev, 0x40, new);

 	if (pci_read_byte(dev, 0x40) != new) {
 		printf("tried to set 0x%x to 0x%x on %s failed (WARNING ONLY)\n", 0x40, new, name);
 		return -1;
 	}
 	return 0;
 }

 static int enable_flash_ck804(struct pci_dev *dev, char *name)
 {
 	/* register 4e.b gets or'ed with one */
 	uint8_t old, new;

 	/* if it fails, it fails. There are so many variations of broken mobos
 	 * that it is hard to argue that we should quit at this point.
 	 */

 	/* dump_pci_device(dev); */

 	old = pci_read_byte(dev, 0x88);
 	new = old | 0xc0;
 	if (new != old) {
 		pci_write_byte(dev, 0x88, new);
 		if (pci_read_byte(dev, 0x88) != new) {
 			printf("tried to set 0x%x to 0x%x on %s failed (WARNING ONLY)\n", 0x88, new, name);
 		}
 	}

 	old = pci_read_byte(dev, 0x6d);
 	new = old | 0x01;
 	if (new == old)
 		return 0;
 	pci_write_byte(dev, 0x6d, new);

 	if (pci_read_byte(dev, 0x6d) != new) {
 		printf("tried to set 0x%x to 0x%x on %s failed (WARNING ONLY)\n", 0x6d, new, name);
 		return -1;
 	}
 	return 0;
 }

 static int enable_flash_sb400(struct pci_dev *dev, char *name)
 {
 	uint8_t tmp;

 	struct pci_filter f;
 	struct pci_dev *smbusdev;

 	/* then look for the smbus device */
 	pci_filter_init((struct pci_access *)0, &f);
 	f.vendor = 0x1002;
 	f.device = 0x4372;

 	for (smbusdev = pacc->devices; smbusdev; smbusdev = smbusdev->next) {
 		if (pci_filter_match(&f, smbusdev)) {
 			break;
 		}
 	}

 	if (!smbusdev) {
 		fprintf(stderr, "ERROR: SMBus device not found. aborting\n");
 		exit(1);
 	}

 	/* enable some smbus stuff */
 	tmp = pci_read_byte(smbusdev, 0x79);
 	tmp |= 0x01;
 	pci_write_byte(smbusdev, 0x79, tmp);

 	/* change southbridge */
 	tmp = pci_read_byte(dev, 0x48);
 	tmp |= 0x21;
 	pci_write_byte(dev, 0x48, tmp);

 	/* now become a bit silly. */
 	tmp = inb(0xc6f);
 	outb(tmp, 0xeb);
 	outb(tmp, 0xeb);
 	tmp |= 0x40;
 	outb(tmp, 0xc6f);
 	outb(tmp, 0xeb);
 	outb(tmp, 0xeb);

 	return 0;
 }

 static int enable_flash_mcp55(struct pci_dev *dev, char *name)
 {
 	/* register 4e.b gets or'ed with one */
 	unsigned char old, new, byte;
 	unsigned short word;

 	/* if it fails, it fails. There are so many variations of broken mobos
 	 * that it is hard to argue that we should quit at this point.
 	 */

 	/* dump_pci_device(dev); */

 	/* Set the 4MB enable bit bit */
 	byte = pci_read_byte(dev, 0x88);
 	byte |= 0xff;		/* 256K */
 	pci_write_byte(dev, 0x88, byte);
 	byte = pci_read_byte(dev, 0x8c);
 	byte |= 0xff;		/* 1M */
 	pci_write_byte(dev, 0x8c, byte);
 	word = pci_read_word(dev, 0x90);
 	word |= 0x7fff;		/* 15M */
 	pci_write_word(dev, 0x90, word);

 	old = pci_read_byte(dev, 0x6d);
 	new = old | 0x01;
 	if (new == old)
 		return 0;
 	pci_write_byte(dev, 0x6d, new);

 	if (pci_read_byte(dev, 0x6d) != new) {
 		printf
 		    ("tried to set 0x%x to 0x%x on %s failed (WARNING ONLY)\n",
 		     0x6d, new, name);
 		return -1;
 	}

 	return 0;

 }

 typedef struct penable {
 	unsigned short vendor, device;
 	char *name;
 	int (*doit) (struct pci_dev * dev, char *name);
 } FLASH_ENABLE;

 static FLASH_ENABLE enables[] = {
 	{0x1039, 0x0630, "SIS630", enable_flash_sis630},
 	{0x8086, 0x7110, "PIIX4/PIIX4E/PIIX4M", enable_flash_piix4},
 	{0x8086, 0x2410, "ICH", enable_flash_ich_4e},
 	{0x8086, 0x2420, "ICH0", enable_flash_ich_4e},
 	{0x8086, 0x2440, "ICH2", enable_flash_ich_4e},
 	{0x8086, 0x244c, "ICH2-M", enable_flash_ich_4e},
 	{0x8086, 0x2480, "ICH3-S", enable_flash_ich_4e},
 	{0x8086, 0x248c, "ICH3-M", enable_flash_ich_4e},
 	{0x8086, 0x24c0, "ICH4/ICH4-L", enable_flash_ich_4e},
 	{0x8086, 0x24cc, "ICH4-M", enable_flash_ich_4e},
 	{0x8086, 0x24d0, "ICH5/ICH5R", enable_flash_ich_4e},
 	{0x8086, 0x2640, "ICH6/ICH6R", enable_flash_ich_dc},
 	{0x8086, 0x2641, "ICH6-M", enable_flash_ich_dc},
 	{0x8086, 0x27b0, "ICH7DH", enable_flash_ich_dc},
 	{0x8086, 0x27b8, "ICH7/ICH7R", enable_flash_ich_dc},
 	{0x8086, 0x27b9, "ICH7M", enable_flash_ich_dc},
 	{0x8086, 0x27bd, "ICH7MDH", enable_flash_ich_dc},
 	{0x8086, 0x2810, "ICH8/ICH8R", enable_flash_ich_dc},
 	{0x8086, 0x2812, "ICH8DH", enable_flash_ich_dc},
 	{0x8086, 0x2814, "ICH8DO", enable_flash_ich_dc},
 	{0x1106, 0x8231, "VT8231", enable_flash_vt823x},
 	{0x1106, 0x3177, "VT8235", enable_flash_vt823x},
 	{0x1106, 0x3227, "VT8237", enable_flash_vt823x},
 	{0x1106, 0x8324, "CX700", enable_flash_vt823x},
 	{0x1106, 0x0686, "VT82C686", enable_flash_amd8111},
 	{0x1078, 0x0100, "CS5530", enable_flash_cs5530},
 	{0x100b, 0x0510, "SC1100", enable_flash_sc1100},
 	{0x1039, 0x0008, "SIS5595", enable_flash_sis5595},
 	{0x1022, 0x7468, "AMD8111", enable_flash_amd8111},
 	/* this fallthrough looks broken. */
 	{0x10de, 0x0050, "NVIDIA CK804", enable_flash_ck804},	/* LPC */
 	{0x10de, 0x0051, "NVIDIA CK804", enable_flash_ck804},	/* Pro */
 	{0x10de, 0x00d3, "NVIDIA CK804", enable_flash_ck804},	/* Slave, should not be here, to fix known bug for A01. */

 	{0x10de, 0x0260, "NVidia MCP51", enable_flash_ck804},
 	{0x10de, 0x0261, "NVidia MCP51", enable_flash_ck804},
 	{0x10de, 0x0262, "NVidia MCP51", enable_flash_ck804},
 	{0x10de, 0x0263, "NVidia MCP51", enable_flash_ck804},

 	{0x10de, 0x0360, "NVIDIA MCP55", enable_flash_mcp55},	/* Gigabyte m57sli-s4 */
 	{0x10de, 0x0361, "NVIDIA MCP55", enable_flash_mcp55},	/* LPC */
 	{0x10de, 0x0362, "NVIDIA MCP55", enable_flash_mcp55},	/* LPC */
 	{0x10de, 0x0363, "NVIDIA MCP55", enable_flash_mcp55},	/* LPC */
 	{0x10de, 0x0364, "NVIDIA MCP55", enable_flash_mcp55},	/* LPC */
 	{0x10de, 0x0365, "NVIDIA MCP55", enable_flash_mcp55},	/* LPC */
 	{0x10de, 0x0366, "NVIDIA MCP55", enable_flash_mcp55},	/* LPC */
 	{0x10de, 0x0367, "NVIDIA MCP55", enable_flash_mcp55},	/* Pro */

 	{0x1002, 0x4377, "ATI SB400", enable_flash_sb400},	/* ATI Technologies Inc IXP SB400 PCI-ISA Bridge (rev 80) */
 };

 /*
  *
  */
 int chipset_flash_enable(void)
 {
 	struct pci_dev *dev = 0;
 	int ret = -2;		/* nothing! */
 	int i;

 	/* now let's try to find the chipset we have ... */
 	for (i = 0; i < sizeof(enables) / sizeof(enables[0]); i++) {
 		dev = pci_dev_find(enables[i].vendor, enables[i].device);
 		if (dev)
 			break;
 	}

 	if (dev) {
 		printf("Found chipset \"%s\": Enabling flash write... ",
 		       enables[i].name);

 		ret = enables[i].doit(dev, enables[i].name);
 		if (ret)
 			printf("Failed!\n");
 		else
 			printf("OK.\n");
 	}

 	return ret;
 }
	/*
	* flash rom utility: enable flash writes
	*
	* Copyright (C) 2000 Silicon Integrated System Corporation
	* Copyright (C) 2005-2007 coresystems GmbH <stepan@coresystems.de>
	* Copyright (C) 2006 Uwe Hermann <uwe@hermann-uwe.de>
	*
	* This program is free software; you can redistribute it and/or
	* modify it under the terms of the GNU General Public License
	* version 2
	*
	*/

	#include <stdio.h>
	#include <pci/pci.h>
	#include <stdlib.h>

	#include "flash.h"
	#include "debug.h"

	static int enable_flash_sis630(struct pci_dev dev, char name)
	{
	char b;

	/* Enable 0xFFF8000~0xFFFF0000 decoding on SiS 540/630 */
	outl(0x80000840, 0x0cf8);
	b = inb(0x0cfc) \| 0x0b;
	outb(b, 0xcfc);
	/* Flash write enable on SiS 540/630 */
	outl(0x80000845, 0x0cf8);
	b = inb(0x0cfd) \| 0x40;
	outb(b, 0xcfd);

	/* The same thing on SiS 950 SuperIO side */
	outb(0x87, 0x2e);
	outb(0x01, 0x2e);
	outb(0x55, 0x2e);
	outb(0x55, 0x2e);

	if (inb(0x2f) != 0x87) {
	outb(0x87, 0x4e);
	outb(0x01, 0x4e);
	outb(0x55, 0x4e);
	outb(0xaa, 0x4e);
	if (inb(0x4f) != 0x87) {
	printf("Can not access SiS 950\n");
	return -1;
	}
	outb(0x24, 0x4e);
	b = inb(0x4f) \| 0xfc;
	outb(0x24, 0x4e);
	outb(b, 0x4f);
	outb(0x02, 0x4e);
	outb(0x02, 0x4f);
	}

	outb(0x24, 0x2e);
	printf("2f is %#x\n", inb(0x2f));
	b = inb(0x2f) \| 0xfc;
	outb(0x24, 0x2e);
	outb(b, 0x2f);

	outb(0x02, 0x2e);
	outb(0x02, 0x2f);

	return 0;
	}

	/* Datasheet:
	* - Name: 82371AB PCI-TO-ISA / IDE XCELERATOR (PIIX4)
	* - URL: http://www.intel.com/design/intarch/datashts/290562.htm
	* - PDF: http://www.intel.com/design/intarch/datashts/29056201.pdf
	* - Order Number: 290562-001
	*/
	static int enable_flash_piix4(struct pci_dev dev, char name)
	{
	uint16_t old, new;
	uint16_t xbcs = 0x4e; /* X-Bus Chip Select register. */

	old = pci_read_word(dev, xbcs);

	/* Set bit 9: 1-Meg Extended BIOS Enable (PCI master accesses to
	* FFF00000-FFF7FFFF are forwarded to ISA).
	* Set bit 7: Extended BIOS Enable (PCI master accesses to
	* FFF80000-FFFDFFFF are forwarded to ISA).
	* Set bit 6: Lower BIOS Enable (PCI master, or ISA master accesses to
	* the lower 64-Kbyte BIOS block (E0000-EFFFF) at the top
	* of 1 Mbyte, or the aliases at the top of 4 Gbyte
	* (FFFE0000-FFFEFFFF) result in the generation of BIOSCS#.
	* Note: Accesses to FFFF0000-FFFFFFFF are always forwarded to ISA.
	* Set bit 2: BIOSCS# Write Enable (1=enable, 0=disable).
	*/
	new = old \| 0x2c4;

	if (new == old)
	return 0;

	pci_write_word(dev, xbcs, new);

	if (pci_read_word(dev, xbcs) != new) {
	printf("tried to set 0x%x to 0x%x on %s failed (WARNING ONLY)\n", xbcs, new, name);
	return -1;
	}
	return 0;
	}

	static int enable_flash_ich(struct pci_dev dev, char name, int bios_cntl)
	{
	/* register 4e.b gets or'ed with one */
	uint8_t old, new;

	/* if it fails, it fails. There are so many variations of broken mobos
	* that it is hard to argue that we should quit at this point.
	*/

	/* Note: the ICH0-ICH5 BIOS_CNTL register is actually 16 bit wide, but
	* just treating it as 8 bit wide seems to work fine in practice.
	*/

	/* see ie. page 375 of "Intel ICH7 External Design Specification"
	* http://download.intel.com/design/chipsets/datashts/30701302.pdf
	*/

	old = pci_read_byte(dev, bios_cntl);

	new = old \| 1;

	if (new == old)
	return 0;

	pci_write_byte(dev, bios_cntl, new);

	if (pci_read_byte(dev, bios_cntl) != new) {
	printf("tried to set 0x%x to 0x%x on %s failed (WARNING ONLY)\n", bios_cntl, new, name);
	return -1;
	}
	return 0;
	}

	static int enable_flash_ich_4e(struct pci_dev dev, char name)
	{
	return enable_flash_ich(dev, name, 0x4e);
	}

	static int enable_flash_ich_dc(struct pci_dev dev, char name)
	{
	return enable_flash_ich(dev, name, 0xdc);
	}

	/*
	*
	*/
	static int enable_flash_vt823x(struct pci_dev dev, char name)
	{
	uint8_t val;

	/* ROM Write enable */
	val = pci_read_byte(dev, 0x40);
	val \|= 0x10;
	pci_write_byte(dev, 0x40, val);

	if (pci_read_byte(dev, 0x40) != val) {
	printf("\nWARNING: Failed to enable ROM Write on \"%s\"\n",
	name);
	return -1;
	}

	return 0;
	}

	static int enable_flash_cs5530(struct pci_dev dev, char name)
	{
	uint8_t new;

	pci_write_byte(dev, 0x52, 0xee);

	new = pci_read_byte(dev, 0x52);

	if (new != 0xee) {
	printf("tried to set register 0x%x to 0x%x on %s failed (WARNING ONLY)\n", 0x52, new, name);
	return -1;
	}

	new = pci_read_byte(dev, 0x5b) \| 0x20;
	pci_write_byte(dev, 0x5b, new);

	return 0;
	}

	static int enable_flash_sc1100(struct pci_dev dev, char name)
	{
	uint8_t new;

	pci_write_byte(dev, 0x52, 0xee);

	new = pci_read_byte(dev, 0x52);

	if (new != 0xee) {
	printf("tried to set register 0x%x to 0x%x on %s failed (WARNING ONLY)\n", 0x52, new, name);
	return -1;
	}
	return 0;
	}

	static int enable_flash_sis5595(struct pci_dev dev, char name)
	{
	uint8_t new, newer;

	new = pci_read_byte(dev, 0x45);

	/* clear bit 5 */
	new &= (~0x20);
	/* set bit 2 */
	new \|= 0x4;

	pci_write_byte(dev, 0x45, new);

	newer = pci_read_byte(dev, 0x45);
	if (newer != new) {
	printf("tried to set register 0x%x to 0x%x on %s failed (WARNING ONLY)\n", 0x45, new, name);
	printf("Stuck at 0x%x\n", newer);
	return -1;
	}
	return 0;
	}

	static int enable_flash_amd8111(struct pci_dev dev, char name)
	{
	/* register 4e.b gets or'ed with one */
	uint8_t old, new;

	/* if it fails, it fails. There are so many variations of broken mobos
	* that it is hard to argue that we should quit at this point.
	*/

	/* enable decoding at 0xffb00000 to 0xffffffff */
	old = pci_read_byte(dev, 0x43);
	new = old \| 0xC0;
	if (new != old) {
	pci_write_byte(dev, 0x43, new);
	if (pci_read_byte(dev, 0x43) != new) {
	printf("tried to set 0x%x to 0x%x on %s failed (WARNING ONLY)\n", 0x43, new, name);
	}
	}

	old = pci_read_byte(dev, 0x40);
	new = old \| 0x01;
	if (new == old)
	return 0;
	pci_write_byte(dev, 0x40, new);

	if (pci_read_byte(dev, 0x40) != new) {
	printf("tried to set 0x%x to 0x%x on %s failed (WARNING ONLY)\n", 0x40, new, name);
	return -1;
	}
	return 0;
	}

	static int enable_flash_ck804(struct pci_dev dev, char name)
	{
	/* register 4e.b gets or'ed with one */
	uint8_t old, new;

	/* if it fails, it fails. There are so many variations of broken mobos
	* that it is hard to argue that we should quit at this point.
	*/

	/* dump_pci_device(dev); */

	old = pci_read_byte(dev, 0x88);
	new = old \| 0xc0;
	if (new != old) {
	pci_write_byte(dev, 0x88, new);
	if (pci_read_byte(dev, 0x88) != new) {
	printf("tried to set 0x%x to 0x%x on %s failed (WARNING ONLY)\n", 0x88, new, name);
	}
	}

	old = pci_read_byte(dev, 0x6d);
	new = old \| 0x01;
	if (new == old)
	return 0;
	pci_write_byte(dev, 0x6d, new);

	if (pci_read_byte(dev, 0x6d) != new) {
	printf("tried to set 0x%x to 0x%x on %s failed (WARNING ONLY)\n", 0x6d, new, name);
	return -1;
	}
	return 0;
	}

	static int enable_flash_sb400(struct pci_dev dev, char name)
	{
	uint8_t tmp;

	struct pci_filter f;
	struct pci_dev *smbusdev;

	/* then look for the smbus device */
	pci_filter_init((struct pci_access *)0, &f);
	f.vendor = 0x1002;
	f.device = 0x4372;

	for (smbusdev = pacc->devices; smbusdev; smbusdev = smbusdev->next) {
	if (pci_filter_match(&f, smbusdev)) {
	break;
	}
	}

	if (!smbusdev) {
	fprintf(stderr, "ERROR: SMBus device not found. aborting\n");
	exit(1);
	}

	/* enable some smbus stuff */
	tmp = pci_read_byte(smbusdev, 0x79);
	tmp \|= 0x01;
	pci_write_byte(smbusdev, 0x79, tmp);

	/* change southbridge */
	tmp = pci_read_byte(dev, 0x48);
	tmp \|= 0x21;
	pci_write_byte(dev, 0x48, tmp);

	/* now become a bit silly. */
	tmp = inb(0xc6f);
	outb(tmp, 0xeb);
	outb(tmp, 0xeb);
	tmp \|= 0x40;
	outb(tmp, 0xc6f);
	outb(tmp, 0xeb);
	outb(tmp, 0xeb);

	return 0;
	}

	static int enable_flash_mcp55(struct pci_dev dev, char name)
	{
	/* register 4e.b gets or'ed with one */
	unsigned char old, new, byte;
	unsigned short word;

	/* if it fails, it fails. There are so many variations of broken mobos
	* that it is hard to argue that we should quit at this point.
	*/

	/* dump_pci_device(dev); */

	/* Set the 4MB enable bit bit */
	byte = pci_read_byte(dev, 0x88);
	byte \|= 0xff; /* 256K */
	pci_write_byte(dev, 0x88, byte);
	byte = pci_read_byte(dev, 0x8c);
	byte \|= 0xff; /* 1M */
	pci_write_byte(dev, 0x8c, byte);
	word = pci_read_word(dev, 0x90);
	word \|= 0x7fff; /* 15M */
	pci_write_word(dev, 0x90, word);

	old = pci_read_byte(dev, 0x6d);
	new = old \| 0x01;
	if (new == old)
	return 0;
	pci_write_byte(dev, 0x6d, new);

	if (pci_read_byte(dev, 0x6d) != new) {
	printf
	("tried to set 0x%x to 0x%x on %s failed (WARNING ONLY)\n",
	0x6d, new, name);
	return -1;
	}

	return 0;

	}

	typedef struct penable {
	unsigned short vendor, device;
	char *name;
	int (doit) (struct pci_dev dev, char *name);
	} FLASH_ENABLE;

	static FLASH_ENABLE enables[] = {
	{0x1039, 0x0630, "SIS630", enable_flash_sis630},
	{0x8086, 0x7110, "PIIX4/PIIX4E/PIIX4M", enable_flash_piix4},
	{0x8086, 0x2410, "ICH", enable_flash_ich_4e},
	{0x8086, 0x2420, "ICH0", enable_flash_ich_4e},
	{0x8086, 0x2440, "ICH2", enable_flash_ich_4e},
	{0x8086, 0x244c, "ICH2-M", enable_flash_ich_4e},
	{0x8086, 0x2480, "ICH3-S", enable_flash_ich_4e},
	{0x8086, 0x248c, "ICH3-M", enable_flash_ich_4e},
	{0x8086, 0x24c0, "ICH4/ICH4-L", enable_flash_ich_4e},
	{0x8086, 0x24cc, "ICH4-M", enable_flash_ich_4e},
	{0x8086, 0x24d0, "ICH5/ICH5R", enable_flash_ich_4e},
	{0x8086, 0x2640, "ICH6/ICH6R", enable_flash_ich_dc},
	{0x8086, 0x2641, "ICH6-M", enable_flash_ich_dc},
	{0x8086, 0x27b0, "ICH7DH", enable_flash_ich_dc},
	{0x8086, 0x27b8, "ICH7/ICH7R", enable_flash_ich_dc},
	{0x8086, 0x27b9, "ICH7M", enable_flash_ich_dc},
	{0x8086, 0x27bd, "ICH7MDH", enable_flash_ich_dc},
	{0x8086, 0x2810, "ICH8/ICH8R", enable_flash_ich_dc},
	{0x8086, 0x2812, "ICH8DH", enable_flash_ich_dc},
	{0x8086, 0x2814, "ICH8DO", enable_flash_ich_dc},
	{0x1106, 0x8231, "VT8231", enable_flash_vt823x},
	{0x1106, 0x3177, "VT8235", enable_flash_vt823x},
	{0x1106, 0x3227, "VT8237", enable_flash_vt823x},
	{0x1106, 0x8324, "CX700", enable_flash_vt823x},
	{0x1106, 0x0686, "VT82C686", enable_flash_amd8111},
	{0x1078, 0x0100, "CS5530", enable_flash_cs5530},
	{0x100b, 0x0510, "SC1100", enable_flash_sc1100},
	{0x1039, 0x0008, "SIS5595", enable_flash_sis5595},
	{0x1022, 0x7468, "AMD8111", enable_flash_amd8111},
	/* this fallthrough looks broken. */
	{0x10de, 0x0050, "NVIDIA CK804", enable_flash_ck804}, /* LPC */
	{0x10de, 0x0051, "NVIDIA CK804", enable_flash_ck804}, /* Pro */
	{0x10de, 0x00d3, "NVIDIA CK804", enable_flash_ck804}, /* Slave, should not be here, to fix known bug for A01. */

	{0x10de, 0x0260, "NVidia MCP51", enable_flash_ck804},
	{0x10de, 0x0261, "NVidia MCP51", enable_flash_ck804},
	{0x10de, 0x0262, "NVidia MCP51", enable_flash_ck804},
	{0x10de, 0x0263, "NVidia MCP51", enable_flash_ck804},

	{0x10de, 0x0360, "NVIDIA MCP55", enable_flash_mcp55}, /* Gigabyte m57sli-s4 */
	{0x10de, 0x0361, "NVIDIA MCP55", enable_flash_mcp55}, /* LPC */
	{0x10de, 0x0362, "NVIDIA MCP55", enable_flash_mcp55}, /* LPC */
	{0x10de, 0x0363, "NVIDIA MCP55", enable_flash_mcp55}, /* LPC */
	{0x10de, 0x0364, "NVIDIA MCP55", enable_flash_mcp55}, /* LPC */
	{0x10de, 0x0365, "NVIDIA MCP55", enable_flash_mcp55}, /* LPC */
	{0x10de, 0x0366, "NVIDIA MCP55", enable_flash_mcp55}, /* LPC */
	{0x10de, 0x0367, "NVIDIA MCP55", enable_flash_mcp55}, /* Pro */

	{0x1002, 0x4377, "ATI SB400", enable_flash_sb400}, /* ATI Technologies Inc IXP SB400 PCI-ISA Bridge (rev 80) */
	};

	/*
	*
	*/
	int chipset_flash_enable(void)
	{
	struct pci_dev *dev = 0;
	int ret = -2; /* nothing! */
	int i;

	/* now let's try to find the chipset we have ... */
	for (i = 0; i < sizeof(enables) / sizeof(enables[0]); i++) {
	dev = pci_dev_find(enables[i].vendor, enables[i].device);
	if (dev)
	break;
	}

	if (dev) {
	printf("Found chipset \"%s\": Enabling flash write... ",
	enables[i].name);

	ret = enables[i].doit(dev, enables[i].name);
	if (ret)
	printf("Failed!\n");
	else
	printf("OK.\n");
	}

	return ret;
	}