powerpc: Make COFF zImages for old 32-bit powermacs

This adds code to build zImage.coff and/or zImage.initrd.coff when
CONFIG_PPC32 and CONFIG_PPC_PMAC are defined.  It also restructures
the OF client code and adds some workarounds for OF quirks on the
older machines.

Signed-off-by: Paul Mackerras <paulus@samba.org>

1 files changed, 34 insertions, 15 deletions

diff --git a/arch/powerpc/boot/Makefile b/arch/powerpc/boot/Makefile
index b53d677f6742..788dec4c7ef3 100644
--- a/arch/powerpc/boot/Makefile
+++ b/arch/powerpc/boot/Makefile
@@ -25,8 +25,8 @@ HOSTCC		:= gcc
 BOOTCFLAGS      := $(HOSTCFLAGS) -fno-builtin -nostdinc -isystem \
                    $(shell $(CROSS32CC) -print-file-name=include) -fPIC
 BOOTAFLAGS      := -D__ASSEMBLY__ $(BOOTCFLAGS) -traditional -nostdinc
-BOOTLFLAGS      := -T $(srctree)/$(src)/zImage.lds
 OBJCOPYFLAGS    := contents,alloc,load,readonly,data
+OBJCOPY_COFF_ARGS := -O aixcoff-rs6000 --set-start 0x500000
 
 zlib       := infblock.c infcodes.c inffast.c inflate.c inftrees.c infutil.c
 zlibheader := infblock.h infcodes.h inffast.h inftrees.h infutil.h
@@ -35,7 +35,7 @@ zliblinuxheader := zlib.h zconf.h zutil.h
 $(addprefix $(obj)/,$(zlib) main.o): $(addprefix $(obj)/,$(zliblinuxheader)) $(addprefix $(obj)/,$(zlibheader))
 #$(addprefix $(obj)/,main.o): $(addprefix $(obj)/,zlib.h)
 
-src-boot := string.S prom.c main.c div64.S crt0.S
+src-boot := crt0.S string.S prom.c stdio.c main.c div64.S
 src-boot += $(zlib)
 src-boot := $(addprefix $(obj)/, $(src-boot))
 obj-boot := $(addsuffix .o, $(basename $(src-boot)))
@@ -70,7 +70,7 @@ quiet_cmd_bootas = BOOTAS  $@
       cmd_bootas = $(CROSS32CC) -Wp,-MD,$(depfile) $(BOOTAFLAGS) -c -o $@ $<
 
 quiet_cmd_bootld = BOOTLD  $@
-      cmd_bootld = $(CROSS32LD) $(BOOTLFLAGS) -o $@ $(2)
+      cmd_bootld = $(CROSS32LD) -T $(srctree)/$(src)/$(3) -o $@ $(2)
 
 $(patsubst %.c,%.o, $(filter %.c, $(src-boot))): %.o: %.c
         $(call if_changed_dep,bootcc)
@@ -87,12 +87,14 @@ obj-sec = $(foreach section, $(1), $(patsubst %,$(obj)/kernel-%.o, $(section)))
 src-sec = $(foreach section, $(1), $(patsubst %,$(obj)/kernel-%.c, $(section)))
 gz-sec  = $(foreach section, $(1), $(patsubst %,$(obj)/kernel-%.gz, $(section)))
 
-hostprogs-y             := addnote addRamDisk
-targets                 += zImage.vmode zImage.initrd.vmode zImage zImage.initrd \
-                           $(patsubst $(obj)/%,%, $(call obj-sec, $(required) $(initrd))) \
-                           $(patsubst $(obj)/%,%, $(call src-sec, $(required) $(initrd))) \
-                           $(patsubst $(obj)/%,%, $(call gz-sec, $(required) $(initrd))) \
-                           vmlinux.initrd
+hostprogs-y             := addnote addRamDisk hack-coff
+
+targets += zImage.vmode zImage.initrd.vmode zImage zImage.initrd \
+           zImage.coff zImage.initrd.coff \
+           $(patsubst $(obj)/%,%, $(call obj-sec, $(required) $(initrd))) \
+           $(patsubst $(obj)/%,%, $(call src-sec, $(required) $(initrd))) \
+           $(patsubst $(obj)/%,%, $(call gz-sec, $(required) $(initrd))) \
+           vmlinux.initrd
 extra-y                 := initrd.o
 
 quiet_cmd_ramdisk = RAMDISK $@
@@ -114,6 +116,10 @@ quiet_cmd_addsection = ADDSEC  $@
 quiet_cmd_addnote = ADDNOTE $@
       cmd_addnote = $(obj)/addnote $@
 
+quiet_cmd_gencoff = COFF    $@
+      cmd_gencoff = $(OBJCOPY) $(OBJCOPY_COFF_ARGS) $@ && \
+                    $(obj)/hack-coff $@
+
 $(call gz-sec, $(required)): $(obj)/kernel-%.gz: %
         $(call if_changed,gzip)
 
@@ -127,22 +133,35 @@ $(call obj-sec, $(required) $(initrd)): $(obj)/kernel-%.o: $(obj)/kernel-%.c
         $(call if_changed_dep,bootcc)
         $(call cmd,addsection)
 
-$(obj)/zImage.vmode: obj-boot += $(call obj-sec, $(required))
+$(obj)/zImage.vmode $(obj)/zImage.coff: obj-boot += $(call obj-sec, $(required))
 $(obj)/zImage.vmode: $(call obj-sec, $(required)) $(obj-boot) $(srctree)/$(src)/zImage.lds
-        $(call cmd,bootld,$(obj-boot))
+        $(call cmd,bootld,$(obj-boot),zImage.lds)
 
-$(obj)/zImage.initrd.vmode: obj-boot += $(call obj-sec, $(required) $(initrd))
+$(obj)/zImage.initrd.vmode $(obj)/zImage.initrd.coff: obj-boot += $(call obj-sec, $(required) $(initrd))
 $(obj)/zImage.initrd.vmode: $(call obj-sec, $(required) $(initrd)) $(obj-boot) $(srctree)/$(src)/zImage.lds
-        $(call cmd,bootld,$(obj-boot))
+        $(call cmd,bootld,$(obj-boot),zImage.lds)
+
+# For 32-bit powermacs, build the COFF images as well as the ELF images.
+coffimage-$(CONFIG_PPC_PMAC)-$(CONFIG_PPC32) := $(obj)/zImage.coff
+coffrdimg-$(CONFIG_PPC_PMAC)-$(CONFIG_PPC32) := $(obj)/zImage.initrd.coff
 
-$(obj)/zImage: $(obj)/zImage.vmode $(obj)/addnote
+$(obj)/zImage: $(obj)/zImage.vmode $(obj)/addnote $(coffimage-y-y)
         @cp -f $< $@
         $(call if_changed,addnote)
 
-$(obj)/zImage.initrd: $(obj)/zImage.initrd.vmode $(obj)/addnote
+$(obj)/zImage.initrd: $(obj)/zImage.initrd.vmode $(obj)/addnote $(coffrdimg-y-y)
         @cp -f $< $@
         $(call if_changed,addnote)
 
+$(obj)/zImage.coff: $(call obj-sec, $(required)) $(obj-boot) $(srctree)/$(src)/zImage.coff.lds $(obj)/hack-coff
+        $(call cmd,bootld,$(obj-boot),zImage.coff.lds)
+        $(call cmd,gencoff)
+
+$(obj)/zImage.initrd.coff: $(call obj-sec, $(required) $(initrd)) $(obj-boot) \
+                           $(srctree)/$(src)/zImage.coff.lds $(obj)/hack-coff
+        $(call cmd,bootld,$(obj-boot),zImage.coff.lds)
+        $(call cmd,gencoff)
+
 #-----------------------------------------------------------
 # build u-boot images
 #-----------------------------------------------------------