I closed the patch

//#include <southbridge/intel/i82801gx/early_lpc.c>
//#include <southbridge/intel/i82801gx/early_smbus.c>
//#include <southbridge/intel/i82801gx/lpc.c>

and I got error :

bianchi@ubuntu:~/coreboot$ make
    GEN        generated/bootblock.ld
    CP         bootblock/arch/x86/bootblock.ld
    LINK       cbfs/fallback/bootblock.debug
    OBJCOPY    cbfs/fallback/bootblock.elf
    OBJCOPY    bootblock.raw.bin
    CC         romstage/mainboard/intel/i946gz/romstage.o
    LINK       cbfs/fallback/romstage.debug
build/romstage/mainboard/intel/i946gz/romstage.o: In function `mainboard_romstage_entry':
/home/bianchi/coreboot/src/mainboard/intel/i946gz/romstage.c:214: undefined reference to `southbridge_detect_s3_resume'
/home/bianchi/coreboot/src/mainboard/intel/i946gz/romstage.c:217: undefined reference to `enable_smbus'
build/romstage/northbridge/intel/i945/raminit.o: In function `spd_read_byte':
/home/bianchi/coreboot/src/northbridge/intel/i945/raminit.c:62: undefined reference to `smbus_read_byte'
/home/bianchi/coreboot/src/northbridge/intel/i945/raminit.c:62: undefined reference to `smbus_read_byte'
/home/bianchi/coreboot/src/northbridge/intel/i945/raminit.c:62: undefined reference to `smbus_read_byte'
/home/bianchi/coreboot/src/northbridge/intel/i945/raminit.c:62: undefined reference to `smbus_read_byte'
/home/bianchi/coreboot/src/northbridge/intel/i945/raminit.c:62: undefined reference to `smbus_read_byte'
build/romstage/northbridge/intel/i945/raminit.o:/home/bianchi/coreboot/src/northbridge/intel/i945/raminit.c:62: more undefined references to `smbus_read_byte' follow
src/arch/x86/Makefile.inc:264: recipe for target 'build/cbfs/fallback/romstage.debug' failed
make: *** [build/cbfs/fallback/romstage.debug] Error 1

my Kconfig at /src/mainboard/intel/i946gz :

##
## This file is part of the coreboot project.
##
## Copyright (C) 2009 coresystems GmbH
##
## This program is free software; you can redistribute it and/or modify
## it under the terms of the GNU General Public License as published by
## the Free Software Foundation; version 2 of the License.
##
## This program is distributed in the hope that it will be useful,
## but WITHOUT ANY WARRANTY; without even the implied warranty of
## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
## GNU General Public License for more details.
##
if BOARD_INTEL_I946GZ

config BOARD_SPECIFIC_OPTIONS # dummy
	def_bool y
	select CPU_INTEL_SOCKET_LGA775
        select NORTHBRIDGE_INTEL_I945
	select NORTHBRIDGE_INTEL_SUBTYPE_I945GC   
	##select NORTHBRIDGE_INTEL_I946GZ
	##select NORTHBRIDGE_INTEL_SUBTYPE_I946GZ
	select CHECK_SLFRCS_ON_RESUME
	select SOUTHBRIDGE_INTEL_I82801GX
	select SUPERIO_ITE_IT8718F 
	select HAVE_OPTION_TABLE
	select HAVE_PIRQ_TABLE
	select HAVE_MP_TABLE
	select HAVE_ACPI_TABLES
	select HAVE_ACPI_RESUME
	select BOARD_ROMSIZE_KB_512
	select CHANNEL_XOR_RANDOMIZATION
	select MAINBOARD_HAS_NATIVE_VGA_INIT
	select INTEL_EDID

config MAINBOARD_DIR
	string
	default intel/i946gz

config MAINBOARD_PART_NUMBER
	string
	default "I946GZ"

config MMCONF_BASE_ADDRESS
	hex
	default 0xf0000000

config IRQ_SLOT_COUNT
	int
	default 18

config MAX_CPUS
	int
	default 1

endif # BOARD_INTEL_I946GZ

====
Including .c files is a bad idea. We did that before and still do in
some places, but will get rid of it in the future hopefully. Also you
are mixing romstage (early_*.c) and ramstage (lpc.c) code here.

I guess the remaining errors are caused by the mixing.

Hope that helps,
Nico

======