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# -*- makefile -*-
##############################################################################
##############################################################################
#
# IMPORTANT!
#
# The use of this file to set options that affect only single object
# files is deprecated, because changing anything in this file results
# in a complete rebuild, which is slow. All options are gradually
# being migrated to config.h, which does not suffer from this problem.
#
# Only options that affect the entire build (e.g. overriding the $(CC)
# Makefile variable) should be placed in here.
#
##############################################################################
##############################################################################
# Config for i386 Etherboot
#
# Do not delete the tag OptionDescription and /OptionDescription
# It is used to automatically generate the documentation.
#
# @OptionDescrition@
#
# BIOS interface options:
#
# -DPCBIOS
# Compile in support for the normal pcbios
# -DLINUXBIOS
# Compile in support for LinuxBIOS
# -DBBS_BUT_NOT_PNP_COMPLIANT
# Some BIOSes claim to be PNP but they don't conform
# to the BBS spec which specifies that ES:DI must
# point to the string $PnP on entry. This option
# works around those. This option must be added to
# LCONFIG.
# -DNO_DELAYED_INT
# Take control as soon as BIOS detects the ROM.
# Normally hooks onto INT18H or INT19H. Use only if you
# have a very non-conformant BIOS as it bypasses
# BIOS initialisation of devices. This only works for
# legacy ROMs, i.e. PCI_PNP_HEADER not defined.
# This option was formerly called NOINT19H.
# -DBOOT_INT18H
# Etherboot normally hooks onto INT19H for legacy ROMs.
# You can choose to hook onto INT18H (BASIC interpreter
# entry point) instead. This entry point is used when
# all boot devices have been exhausted. This option must
# be added to LCONFIG.
# -DCONFIG_PCI_DIRECT
# Define this for PCI BIOSes that do not implement
# BIOS32 or not correctly. Normally not needed.
# Only works for BIOSes of a certain era.
# -DCONFIG_TSC_CURRTICKS
# Uses the processor time stamp counter instead of reading
# the BIOS time counter. This allows Etherboot to work
# even without a BIOS. This only works on late model
# 486s and above.
# -DCONFIG_NO_TIMER2
# Some systems do not have timer2 implemented.
# If you have a RTC this will allow you to roughly calibrate
# it using outb instructions.
# -DIBM_L40
# This option uses the 0x92 method of controlling
# A20 instead of the traditional method of using the
# keyboard controller. An explanation of A20 is here:
# http://www.win.tue.nl/~aeb/linux/kbd/A20.html
# This occurs on MCA, EISA and some embedded boards,
# and sometimes with the Fast Gate A20 option on some
# BIOSes.
# Enable this only if you are sure of what you are doing.
#
# Extended cpu options
# -DCONFIG_X86_64
# Compile in support for booting x86_64 64bit binaries.
#
# PXE loader options:
#
# -DPXELOADER_KEEP_ALL
# Prevent PXE loader (prefix) from unloading the
# PXE stack. You will want to use this if, for
# example, you are booting via PXE-on-floppy.
# You may want to use it under certain
# circumstances when using the Etherboot UNDI
# driver; these are complex and best practice is
# not yet established.
#
# Obscure options you probably don't need to touch:
#
# -DIGNORE_E820_MAP
# Ignore the memory map returned by the E820 BIOS
# call. May be necessary on some buggy BIOSes.
# -DT503_AUI
# Use AUI by default on 3c503 cards.
# -DFLATTEN_REAL_MODE
# Use 4GB segment limits when calling out to or
# returning to real-mode code. This is necessary to
# work around some buggy code (e.g. OpenBSD's pxeboot)
# that uses flat real-mode without being sufficiently
# paranoid about the volatility of its segment limits.
#
# @/OptionDescription@
# BIOS select don't change unless you know what you are doing
CFLAGS+= -DPCBIOS
# Compile in k8/hammer support
# CFLAGS+= -DCONFIG_X86_64
# Options to make a version of Etherboot that will work under linuxBIOS.
# CFLAGS+= -DLINUXBIOS -DCONFIG_TSC_CURRTICKS -DCONSOLE_SERIAL -DCOMCONSOLE=0x3f8 -DCOMPRESERVE -DCONFIG_PCI_DIRECT -DELF_IMAGE
# These options affect the loader that is prepended to the Etherboot image
# LCONFIG+= -DBBS_BUT_NOT_PNP_COMPLIANT
# LCONFIG+= -DBOOT_INT18H
# Produce code that will work with OpenBSD's pxeboot
# CFLAGS+= -DFLATTEN_REAL_MODE
CFLAGS+= -fstrength-reduce -fomit-frame-pointer -march=i386
# Squeeze the code in as little space as possible.
# gcc3 needs a different syntax to gcc2 if you want to avoid spurious warnings.
GCC_VERSION = $(subst ., ,$(shell $(CC) -dumpversion))
GCC_MAJORVERSION = $(firstword $(GCC_VERSION))
ifeq ($(GCC_MAJORVERSION),2)
CFLAGS+= -malign-jumps=1 -malign-loops=1 -malign-functions=1
else
CFLAGS+= -falign-jumps=1 -falign-loops=1 -falign-functions=1
endif
GCC_MINORVERSION = $(word 2, $(GCC_VERSION))
ifneq ($(GCC_MINORVERSION),4)
CFLAGS+= -march=i386
endif
LDFLAGS+= -N
ifeq "$(shell uname -s)" "FreeBSD"
CFLAGS+= -DIMAGE_FREEBSD -DELF_IMAGE -DAOUT_IMAGE
endif
# An alternate location for isolinux.bin can be set here
# ISOLINUX_BIN=/path/to/isolinux.bin
# These seem to have some relevance to compiling on x86_64
# EXTRA_CFLAGS=-m32
# EXTRA_ASFLAGS=--32
# EXTRA_LDFLAGS=-m elf_i386
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