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