src/southbridge/nvidia/ck804/ck804_enable_rom.c


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/*
 * Copyright 2004 Tyan Computer
 *  by yhlu@tyan.com
 */

#if CONFIG_HT_CHAIN_END_UNITID_BASE < CONFIG_HT_CHAIN_UNITID_BASE
#define CK804_DEVN_BASE CONFIG_HT_CHAIN_END_UNITID_BASE
#else
#define CK804_DEVN_BASE CONFIG_HT_CHAIN_UNITID_BASE
#endif

static void ck804_enable_rom(void)
{
	unsigned char byte;
	device_t addr;

	/* Enable 4MB ROM access at 0xFFC00000 - 0xFFFFFFFF. */
	/* Locate the ck804 LPC. */
	addr = PCI_DEV(0, (CK804_DEVN_BASE + 1), 0);

	/* Set the 4MB enable bit. */
	byte = pci_read_config8(addr, 0x88);
	byte |= 0x80;
	pci_write_config8(addr, 0x88, byte);
}