kbuild: initramfs updates

Use ld to link the cpio archive into the image, build was broken
due to requiring a recent version of objcopy before, plus assorted
cleanups:

o Don't include arch/$(ARCH)/Makefile, export the needed arch-specific
  flags instead.
o Name the generated section consistently .init.ramfs everywhere.

Makefile

@@ -175,7 +175,7 @@ AFLAGS		:= -D__ASSEMBLY__ $(CPPFLAGS)
 export	VERSION PATCHLEVEL SUBLEVEL EXTRAVERSION KERNELRELEASE ARCH \
 	CONFIG_SHELL TOPDIR HOSTCC HOSTCFLAGS CROSS_COMPILE AS LD CC \
 	CPP AR NM STRIP OBJCOPY OBJDUMP MAKE AWK GENKSYMS PERL UTS_MACHINE \
-	HOSTCXX HOSTCXXFLAGS
+	HOSTCXX HOSTCXXFLAGS LDFLAGS_BLOB
 
 export CPPFLAGS NOSTDINC_FLAGS OBJCOPYFLAGS LDFLAGS
 export CFLAGS CFLAGS_KERNEL CFLAGS_MODULE 

arch/i386/Makefile

@@ -18,8 +18,8 @@
 
 LDFLAGS		:= -m elf_i386
 OBJCOPYFLAGS	:= -O binary -R .note -R .comment -S
-ARCHBLOBLFLAGS	:= -I binary -O elf32-i386 -B i386
 LDFLAGS_vmlinux := -e stext
+LDFLAGS_BLOB	:= --format binary --oformat elf32-i386
 
 CFLAGS += -pipe
 

arch/i386/vmlinux.lds.S

@@ -79,7 +79,7 @@ SECTIONS
   __initcall_end = .;
   . = ALIGN(4096);
   __initramfs_start = .;
-  .init.ramfs : { *(.init.initramfs) }
+  .init.ramfs : { *(.init.ramfs) }
   __initramfs_end = .;
   . = ALIGN(32);
   __per_cpu_start = .;

usr/Makefile

 
-include arch/$(ARCH)/Makefile
-
 obj-y := initramfs_data.o
 
 host-progs := gen_init_cpio
 
 clean-files := initramfs_data.cpio.gz
 
-$(obj)/initramfs_data.o: $(obj)/initramfs_data.cpio.gz
-	$(OBJCOPY) $(ARCHBLOBLFLAGS) \
-		--rename-section .data=.init.initramfs \
-		$(obj)/initramfs_data.cpio.gz $(obj)/initramfs_data.o
-	$(STRIP) -s $(obj)/initramfs_data.o
+LDFLAGS_initramfs_data.o := $(LDFLAGS_BLOB) -r -T
+
+$(obj)/initramfs_data.o: $(src)/initramfs_data.scr $(obj)/initramfs_data.cpio.gz FORCE
+	$(call if_changed,ld)
 
 $(obj)/initramfs_data.cpio.gz: $(obj)/gen_init_cpio
-	( cd $(obj) ; ./gen_init_cpio | gzip -9c > initramfs_data.cpio.gz )
+	( cd $(obj) ; ./$< | gzip -9c > $@ )
+
 

usr/initramfs_data.scr

+SECTIONS
+{
+	.init.ramfs : { *(.data) }
+}