[Buildroot] OF FDT compilation support
Thomas Petazzoni
thomas.petazzoni at free-electrons.com
Tue Nov 23 21:45:05 UTC 2010
Hello,
On Wed, 17 Nov 2010 14:49:06 +0300
Stanislav Bogatyrev <realloc at gmail.com> wrote:
> #
> +# Device tree
> +#
> +
> +config BR2_LINUX_BUILD_DT
I think I'd prefer BR2_LINUX_DEVICE_TREE (ditto for all other options)
> + bool "Compile OpenFirmware Flattened Device Tree"
Indentation before bool, depends on, help, etc. is one tab. Could you
fix everywhere ?
> + depends on BR2_powerpc
> + help
> + Compile OpenFirmware Flattened Device Tree
And for help text it's one tab and two spaces. Could you fix
everywhere ?
A slightly better help text would be useful as well.
> +config BR2_LINUX_BUILD_DT_FORCE
> + bool "Force - try to produce output even if the input tree has errors"
> + depends on BR2_LINUX_BUILD_DT
We don't really have many "force" options anywhere else in Buildroot.
Is this really needed ?
Replace all BR2_LINUX_BUILD_DT by an enclosing if BR2_LINUX_DEVICE_TREE
> +config BR2_LINUX_BUILD_DT_LIST
> + string "List of .dts files to compile"
> + depends on BR2_LINUX_BUILD_DT
> +
> +choice
> + prompt "DTC output format"
> + depends on BR2_LINUX_BUILD_DT
> + default BR2_LINUX_BUILD_DT_DTB
> +
> +config BR2_LINUX_BUILD_DT_DTB
> + bool "dtb"
> +
> +config BR2_LINUX_BUILD_DT_DTS
> + bool "dts"
> +
> +config BR2_LINUX_BUILD_DT_ASM
> + bool "asm"
> +endchoice
What are all those formats for ?
> +config BR2_LINUX_BUILD_DT_BOOT_CPU
> + string "CPU number to boot"
> + default 0
> + depends on BR2_LINUX_BUILD_DT
> +
> +config BR2_LINUX_BUILD_DT_EXTRA_SPACE
> + string "Make the blob at least <bytes> long (extra space)"
> + default 0
> + depends on BR2_LINUX_BUILD_DT && ( BR2_LINUX_BUILD_DT_DTB || BR2_LINUX_BUILD_DT_ASM )
> +
> +config BR2_LINUX_BUILD_DT_RESERVED_SPACE
> + string "Make space for <number> reserve map entries"
> + default 0
> + depends on BR2_LINUX_BUILD_DT && ( BR2_LINUX_BUILD_DT_DTB || BR2_LINUX_BUILD_DT_ASM )
> +
> +config BR2_LINUX_BUILD_DT_PADDING_SPACE
> + string "Add padding to the blob of <bytes> long (extra space)"
> + default 0
> + depends on BR2_LINUX_BUILD_DT && ( BR2_LINUX_BUILD_DT_DTB || BR2_LINUX_BUILD_DT_ASM )
I am not very familiar with the device tree, are those options really
useful in general ?
> +# prepare command-line arguments for dtc
> +LINUX26_DTS_PATH=$(LINUX26_DIR)/arch/$(KERNEL_ARCH)/boot/dts
> +LINUX26_DTC=$(LINUX26_DIR)/arch/$(KERNEL_ARCH)/boot/dtc
> +
> +ifeq ($(BR2_LINUX_BUILD_DT_FORCE),y)
> +LINUX26_DTC_ARG+= -f
> +endif
> +
> +ifeq ($(BR2_LINUX_BUILD_DT_DTB),y)
> +LINUX26_DTC_OUTF+=dtb
> +else ifeq ($(BR2_LINUX_BUILD_DT_ASM),y)
> +LINUX26_DTC_OUTF+=asm
> +else ifeq ($(BR2_LINUX_BUILD_DT_DTS),y)
> +LINUX26_DTC_OUTF+=dts
> +endif
Those lines should probably be LINUX26_DTC_OUTF= and not += since they
are mutually exclusive.
> +LINUX26_DTC_ARG+= -b $(call qstrip,$(BR2_LINUX_BUILD_DT_BOOT_CPU)) \
> +-R $(call qstrip,$(BR2_LINUX_BUILD_DT_RESERVED_SPACE)) \
> +-S $(call qstrip,$(BR2_LINUX_BUILD_DT_EXTRA_SPACE)) \
> +-p $(call qstrip,$(BR2_LINUX_BUILD_DT_PADDING_SPACE)) \
> +-o $(BINARIES_DIR)/$(file).$(LINUX26_DTC_OUTF) \
> +-O $(LINUX26_DTC_OUTF)
One tab here before each continuing line.
> +# Flattened Device Tree compilation
> +$(LINUX26_DIR)/.stamp_dt_compiled: $(LINUX26_DIR)/.stamp_compiled
> +ifeq ($(BR2_LINUX_BUILD_DT),y)
> + @$(call MESSAGE,"Compiling Flattened Device Tree")
> + $(foreach file, $(call qstrip,$(BR2_LINUX_BUILD_DT_LIST)), \
> + $(LINUX26_DTC) $(LINUX26_DTC_ARG) $(LINUX26_DTS_PATH)/$(file).dts;)
> +endif
> + $(Q)touch $@
> +
> # Installation
> $(LINUX26_DIR)/.stamp_installed: $(LINUX26_DIR)/.stamp_compiled
> @$(call MESSAGE,"Installing kernel")
> @@ -143,7 +176,7 @@ $(LINUX26_DIR)/.stamp_installed: $(LINUX26_DIR)/.stamp_compiled
> fi
> $(Q)touch $@
>
> -linux26: host-module-init-tools $(LINUX26_DEPENDENCIES) $(LINUX26_DIR)/.stamp_installed
> +linux26: host-module-init-tools $(LINUX26_DEPENDENCIES) $(LINUX26_DIR)/.stamp_installed $(LINUX26_DIR)/.stamp_dt_compiled
I think I'd prefer something such as:
+$(LINUX26_DIR)/.stamp_dt_compiled: $(LINUX26_DIR)/.stamp_compiled
+ @$(call MESSAGE,"Compiling Flattened Device Tree")
+ $(foreach file, $(call qstrip,$(BR2_LINUX_BUILD_DT_LIST)), \
+ $(LINUX26_DTC) $(LINUX26_DTC_ARG) $(LINUX26_DTS_PATH)/$(file).dts;)
+ $(Q)touch $@
+
+ifeq ($(BR2_LINUX_BUILD_DT),y)
+LINUX26_DEVICE_TREE_DEP=$(LINUX26_DIR)/.stamp_dt_compiled
+endif
[...]
-linux26: host-module-init-tools $(LINUX26_DEPENDENCIES) $(LINUX26_DIR)/.stamp_installed
+linux26: host-module-init-tools $(LINUX26_DEPENDENCIES) $(LINUX26_DIR)/.stamp_installed $(LINUX26_DEVICE_TREE_DEP)
Thanks!
Thomas
--
Thomas Petazzoni, Free Electrons
Kernel, drivers, real-time and embedded Linux
development, consulting, training and support.
http://free-electrons.com
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