[RFC] New target 'cuImage' - compatibility uImage

[Milton Miller]

On Wed Aug  2 2006 03:59:06 PM CDT, Matthew McClintock wrote:
> The following is a patch which creates a new target called 'cuImage'. It
> is designed to correctly package the kernel along with the
> 'arch/powerpc/boot' wrapper code into a uImage to be loaded and started
> by U-Boot.
> 
> The purpose of this target is to allow boards with older versions of
> U-Boot to utilize the 'bootm' command within U-Boot to run new powerpc
> kernels. 
...

> And the new cuImage will look like this:
> 
[add 'ompressed' uimage header and use uncompressed kernel]

Wolfgang already asked why you were using the uncompressed
kernel, and whart you meant by compressed uimage header.

Please describe when this would be used vs the existing uimage.
Can newer uboot boot the current uimage kernels?

> 
> -Matthew


I'm going to switch styles here during the patch.  I'll mark my comments
with  leading ; on the line.


diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig
index 13e583f..2d2c39a 100644
--- a/arch/powerpc/Kconfig
+++ b/arch/powerpc/Kconfig
@@ -96,11 +96,21 @@ config GENERIC_TBSYNC
 	default n
 
 config DEFAULT_UIMAGE
-	bool
+	bool "Set uImage to be the default build target"
 	help
 	  Used to allow a board to specify it wants a uImage built by default
 	default n

; If we are going to do this, it seems like this should be part of a choice or multiselect.

+config UIMAGELOADADDR
+	hex "Set the uImage load address"
+	default 400000
+	depends on DEFAULT_UIMAGE 
+
+config UIMAGEENTRY
+	hex "Set the uImage entry address"
+	default 400010
+

; Make these questions, not the variables, the if clause to avoid the ifdef in the makefile.
:
: Is the entry point independent of the load address?
:

	depends on DEFAULT_UIMAGE 
+
 menu "Processor support"compatibility 
 choice
 	prompt "Processor Type"
diff --git a/arch/powerpc/Makefile b/arch/powerpc/Makefile
index 01667d1..eefbe16 100644
--- a/arch/powerpc/Makefile
+++ b/arch/powerpc/Makefile
@@ -141,12 +141,13 @@ # Default to zImage, override when neede
 defaultimage-y			:= zImage
 defaultimage-$(CONFIG_PPC_ISERIES) := vmlinux
 defaultimage-$(CONFIG_DEFAULT_UIMAGE) := uImage
+defaultimage-$(CONFIG_DEFAULT_UIMAGE) := cuImage

; We need both?

 KBUILD_IMAGE := $(defaultimage-y)
 all: $(KBUILD_IMAGE)
 
 CPPFLAGS_vmlinux.lds	:= -Upowerpc
 
-BOOT_TARGETS = zImage zImage.initrd znetboot znetboot.initrd vmlinux.sm
uImage vmlinux.bin
+BOOT_TARGETS = zImage zImage.initrd znetboot znetboot.initrd vmlinux.sm
uImage vmlinux.bin cuImage
 
 PHONY += $(BOOT_TARGETS)
 
diff --git a/arch/powerpc/boot/Makefile b/arch/powerpc/boot/Makefile
index daad857..72e8ad8 100644
--- a/arch/powerpc/boot/Makefile
+++ b/arch/powerpc/boot/Makefile
@@ -23,7 +23,8 @@ #	in the toplevel makefile.
 
 HOSTCC		:= gcc
 BOOTCFLAGS	:= $(HOSTCFLAGS) -fno-builtin -nostdinc -isystem \
-		   $(shell $(CROSS32CC) -print-file-name=include) -fPIC
+		   $(shell $(CROSS32CC) -print-file-name=include) -fPIC \
+		   -fno-schedule-insns -fno-schedule-insns2 -fno-inline

; Where did this come from? Seperate patch???


 BOOTAFLAGS	:= -D__ASSEMBLY__ $(BOOTCFLAGS) -traditional -nostdinc
 OBJCOPYFLAGS    := contents,alloc,load,readonly,data
 OBJCOPY_COFF_ARGS := -O aixcoff-rs6000 --set-start 0x500000
@@ -198,10 +199,18 @@ cmd_mygzip = gzip -f -9 < $< > $@.$$$$ &
 quiet_cmd_objbin = OBJCOPY $@
       cmd_objbin = $(OBJCOPY) -O binary $< $@
 
+ifndef CONFIG_UIMAGELOADADDR
+CONFIG_UIMAGELOADADDR = 00000000
+endif
+
+ifndef CONFIG_UIMAGEENTRY
+CONFIG_UIMAGEENTRY = 00000000
+endif
+

; See comments in Kconfig  Or, we can leave them undefied if we aren't making this

 quiet_cmd_uimage = UIMAGE $@
       cmd_uimage = $(CONFIG_SHELL) $(MKIMAGE) -A ppc -O linux -T kernel
\
-               -C gzip -a 00000000 -e 00000000 -n
'Linux-$(KERNELRELEASE)' \
-               -d $< $@
+	-C gzip -a $(CONFIG_UIMAGELOADADDR) -e $(CONFIG_UIMAGEENTRY)  \
+	-n 'Linux-$(KERNELRELEASE)' -d $< $@
 
 MKIMAGE		:= $(srctree)/scripts/mkuboot.sh
 targets		+= uImage
@@ -223,3 +232,40 @@ install: $(CONFIGURE) $(BOOTIMAGE)
 	sh -x $(srctree)/$(src)/install.sh "$(KERNELRELEASE)" vmlinux
System.map "$(INSTALL_PATH)" "$(BOOTIMAGE)"
 
 clean-files += $(addprefix $(objtree)/, $(obj-boot) vmlinux.strip)
+
+#-----------------------------------------------------------
+# build compatiblity u-boot images
+#-----------------------------------------------------------
+
+targets += cuImage
+
+quiet_cmd_addsection_cuimage = ADDSEC  $@
+      cmd_addsection_cuimage = $(CROSS32OBJCOPY) $@ \
+		--add-section=.kernel:vmlinux.elf=vmlinux \
+		--set-section-flags=.kernel:vmlinux.elf=$(OBJCOPYFLAGS)
+
+$(obj)/kernel-compat.c:
+	@touch $@
+
+$(obj)/kernel-compat.o: $(obj)/kernel-compat.c vmlinux 
+	$(call if_changed_dep,bootcc)
+	$(call cmd,addsection_cuimage)
+
+$(obj)/vmlinux-compat.elf: $(obj-boot) $(obj)/kernel-compat.o
+	$(call cmd,bootld,$(obj-boot) $(obj)/kernel-compat.o,cuImage.lds)
+
+$(obj)/vmlinux-compat.bin: $(obj)/vmlinux-compat.elf
+	$(call if_changed,objbin)
+
+$(obj)/vmlinux-compat.gz: $(obj)/vmlinux-compat.bin
+	$(call if_changed,mygzip)
+
+$(obj)/cuImage: $(obj)/vmlinux-compat.gz $(obj-boot)
+	$(Q)rm -f $@
+	$(call cmd,uimage)
+	@echo -n '  Image: $@ '
+	@if [ -f $@ ]; then echo 'is ready' ; else echo 'not made'; fi
+
+clean-files += vmlinux-compat.elf vmlinux-compat.bin vmlinux-compat.gz
cuImage
+
+