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# Makefile for making ELF bootable images for booting on CHRP
# using Open Firmware.
#
# Geert Uytterhoeven September 1997
#
# Based on coffboot by Paul Mackerras
# Simplified for ppc64 by Todd Inglett
#
# NOTE: this code is built for 32 bit in ELF32 format even though
# it packages a 64 bit kernel. We do this to simplify the
# bootloader and increase compatibility with OpenFirmware.
#
# To this end we need to define BOOTCC, etc, as the tools
# needed to build the 32 bit image. These are normally HOSTCC,
# but may be a third compiler if, for example, you are cross
# compiling from an intel box. Once the 64bit ppc gcc is
# stable it will probably simply be a compiler switch to
# compile for 32bit mode.
# To make it easier to setup a cross compiler,
# CROSS32_COMPILE is setup as a prefix just like CROSS_COMPILE
# in the toplevel makefile.
CROSS32_COMPILE =
#CROSS32_COMPILE = /usr/local/ppc/bin/powerpc-linux-
BOOTCC = $(CROSS32_COMPILE)gcc
BOOTCFLAGS = $(HOSTCFLAGS) -fno-builtin -I$(HPATH)
BOOTLD = $(CROSS32_COMPILE)ld
BOOTAS = $(CROSS32_COMPILE)as
BOOTAFLAGS = -D__ASSEMBLY__ $(HOSTCFLAGS) -I$(HPATH)
OBJCOPYFLAGS = contents,alloc,load,readonly,data
LDVARS= \
--defsym _vmlinux_memsize=0x`$(CROSS_COMPILE)nm -n $(TOPDIR)/vmlinux | sed '$$s/^........\([^ ]*\).*/\1/p;d'` \
--defsym _vmlinux_filesize=0x`ls -l $(TOPDIR)/vmlinux | awk '{ printf "%x\n", $$5 }'`
.c.o:
$(BOOTCC) $(BOOTCFLAGS) -c -o $*.o $<
.S.o:
$(BOOTCC) $(BOOTAFLAGS) -traditional -c -o $*.o $<
CFLAGS = $(CPPFLAGS) -O -fno-builtin -DSTDC_HEADERS
LD_ARGS = -Ttext 0x00400000 -e _start
OBJS = crt0.o string.o prom.o zImage.o zlib.o
LIBS =
ifeq ($(CONFIG_SMP),y)
TFTPIMAGE=/tftpboot/zImage.chrp.smp
else
TFTPIMAGE=/tftpboot/zImage.chrp
endif
ifeq ($(CONFIG_PPC_ISERIES),y)
all: vmlinux.sm
else
all: zImage
endif
znetboot: zImage
cp zImage $(TFTPIMAGE)
ifeq ($(CONFIG_PPC_ISERIES),y)
addSystemMap: addSystemMap.c
$(HOSTCC) $(HOSTCFLAGS) -o addSystemMap addSystemMap.c
vmlinux.sm: $(TOPDIR)/vmlinux addSystemMap
./addSystemMap $(TOPDIR)/System.map $(TOPDIR)/vmlinux vmlinux.sm
addRamDisk: addRamDisk.c
$(HOSTCC) $(HOSTCFLAGS) -o addRamDisk addRamDisk.c
vmlinux.initrd: $(TOPDIR)/vmlinux addRamDisk ramdisk.image.gz $(TOPDIR)/System.map
./addRamDisk ramdisk.image.gz $(TOPDIR)/System.map $(TOPDIR)/vmlinux vmlinux.initrd
vmlinux.sminitrd: vmlinux.sm addRamDisk ramdisk.image.gz $(TOPDIR)/System.map
./addRamDisk ramdisk.image.gz $(TOPDIR)/System.map vmlinux.sm vmlinux.sminitrd
endif
znetboot.initrd: zImage.initrd
cp zImage.initrd $(TFTPIMAGE)
addnote: addnote.c
$(HOSTCC) $(HOSTCFLAGS) -o addnote addnote.c
zImage.o: $(TOPDIR)/vmlinux
uts_string: uts_string.txt
$(OBJCOPY) zImage.o \
--add-section=.kernel:$@=$@.txt \
--set-section-flags=.kernel:$@=$(OBJCOPYFLAGS)
vmlinux .config System.map: % : $(TOPDIR)/% zImage.o
gzip -cvf9 $(TOPDIR)/$@ > kernel-$@.gz
$(OBJCOPY) zImage.o \
--add-section=.kernel:$@=kernel-$@.gz \
--set-section-flags=.kernel:$@=$(OBJCOPYFLAGS)
initrd: ramdisk.image.gz
$(OBJCOPY) zImage.o \
--add-section=.kernel:$@=ramdisk.image.gz \
--set-section-flags=.kernel:$@=$(OBJCOPYFLAGS)
uts_string.txt: $(TOPDIR)/vmlinux
strings $(TOPDIR)/vmlinux | \
grep -E 'Linux version .* .gcc version' > $@
zImage: $(OBJS) addnote uts_string vmlinux .config System.map
$(BOOTLD) $(LD_ARGS) -T zImage.lds -o $@ $(OBJS) $(LIBS) \
$(LDVARS)
./addnote $@
zImage.initrd: $(OBJS) addnote uts_string vmlinux .config System.map initrd
$(BOOTLD) $(LD_ARGS) -T zImage.lds -o $@ $(OBJS) $(LIBS) \
$(LDVARS)
./addnote $@
clean:
rm -f add{note,RamDisk,SystemMap} $(OBJS) initrd.o \
vmlinux.{sm,initrd} zImage{,.initrd} uts_string.txt \
kernel-{vmlinux,.config,System.map}.gz
fastdep:
$(TOPDIR)/scripts/mkdep *.[Sch] > .depend
dep:
$(CPP) $(CPPFLAGS) -M *.S *.c > .depend