Re: [ptxdist] [RFC PATCH] kernel: add build support for device trees

[Michael Olbrich <m.olbrich@pengutronix.de>]

On Fri, Apr 19, 2013 at 05:23:13PM +0200, Hubert Feurstein wrote:
> This patch adds direct build support for device trees within the kernel tree.
> Since kernel version 3.10 the ARM device trees can not be directly processed
> by dtc anymore. They have to pass a CPP stage first. The kernel makefile
> takes care about that.

Actually, I'd like to keep the device tree a bit separate from the kernel,
for various reasons.
But this stuff needs to be cleaned up. I definitively want to get rid of
the separate dtc. Is anyone actually using it? I think it is only needed
for PPC pre 2.6.30 or something like that.

I'm thinking of a separate dts package that (can?) use the same
tarball+patches or something like that.

Michael

> Signed-off-by: Hubert Feurstein <h.feurstein@gmail.com>
> ---
>  platforms/kernel.in | 18 ++++++++++++++++++
>  rules/kernel.make   | 11 ++++++++++-
>  2 files changed, 28 insertions(+), 1 deletion(-)
> 
> diff --git a/platforms/kernel.in b/platforms/kernel.in
> index bf93a3a..8b28a16 100644
> --- a/platforms/kernel.in
> +++ b/platforms/kernel.in
> @@ -30,6 +30,24 @@ config KERNEL_MODULES_BUILD
>  	string
>  	default "modules"
>  
> +config KERNEL_DTBS
> +	bool
> +	default n
> +	prompt "build device trees"
> +
> +config KERNEL_DTBS_BUILD
> +	prompt "list of device tree blobs"
> +	string
> +	depends on KERNEL_DTBS
> +	help
> +	  e.g: imx6q-sabresd.dtb
> +
> +config KERNEL_DTBS_INSTALL
> +	bool
> +	default y
> +	prompt "Install device tree blobs into /boot"
> +	depends on KERNEL_DTBS
> +
>  config KERNEL_VERSION
>  	prompt "kernel version"
>  	string
> diff --git a/rules/kernel.make b/rules/kernel.make
> index 9cf310d..28dbfab 100644
> --- a/rules/kernel.make
> +++ b/rules/kernel.make
> @@ -98,6 +98,8 @@ $(KERNEL_CONFIG):
>  	@exit 1
>  endif
>  
> +KERNEL_DTBS_PATH := $(KERNEL_DIR)/arch/$(PTXCONF_KERNEL_ARCH_STRING)/boot/dts
> +KERNEL_DTBS 	 := $(call remove_quotes, $(PTXCONF_KERNEL_DTBS_BUILD))
>  
>  #
>  # when compiling the rootfs into the kernel, we just include an empty
> @@ -156,7 +158,8 @@ $(STATEDIR)/kernel.compile:
>  		$(KERNEL_DIR)/usr/initramfs_data.cpio.* \
>  		$(KERNEL_DIR)/usr/.initramfs_data.cpio.*
>  	@cd $(KERNEL_DIR) && $(KERNEL_PATH) $(KERNEL_ENV) $(MAKE) \
> -		$(KERNEL_MAKEVARS) $(KERNEL_IMAGE) $(PTXCONF_KERNEL_MODULES_BUILD)
> +		$(KERNEL_MAKEVARS) $(KERNEL_IMAGE) $(PTXCONF_KERNEL_MODULES_BUILD) \
> +		$(KERNEL_DTBS)
>  	@$(call touch)
>  
>  endif # !PTXCONF_PROJECT_USE_PRODUCTION
> @@ -200,6 +203,12 @@ ifdef PTXCONF_KERNEL_INSTALL
>  	@$(call install_copy, kernel, 0, 0, 0644, $(KERNEL_IMAGE_PATH_y), /boot/$(KERNEL_IMAGE), n)
>  endif
>  
> +ifdef PTXCONF_KERNEL_DTBS_INSTALL
> +	@for dtb in $(KERNEL_DTBS); do \
> +		$(call install_copy, kernel, 0, 0, 0644, $(KERNEL_DTBS_PATH)/$${dtb}, /boot/$${dtb}, n); \
> +	done
> +endif
> +
>  # install the ELF kernel image for debugging purpose
>  ifdef PTXCONF_KERNEL_VMLINUX
>  	@$(call install_copy, kernel, 0, 0, 0644, $(KERNEL_DIR)/vmlinux, /boot/vmlinux, n)
> -- 
> 1.8.1.3
> 
> 
> -- 
> ptxdist mailing list
> ptxdist@pengutronix.de
> 

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