linux-kernel - Re: [PATCH 1/4] of: Add support for linking device tree blobs into vmlinux

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Date:	Thu, 23 Dec 2010 07:14:20 +0100
From:	Geert Uytterhoeven <geert@...ux-m68k.org>
To:	Michal Marek <mmarek@...e.cz>
Cc:	dirk.brandewie@...il.com, linux-kernel@...r.kernel.org,
	devicetree-discuss@...ts.ozlabs.org, linuxppc-dev@...ts.ozlabs.org,
	microblaze-uclinux@...e.uq.edu.au, linux-arch@...r.kernel.org,
	linux-kbuild@...r.kernel.org
Subject: Re: [PATCH 1/4] of: Add support for linking device tree blobs into vmlinux

2010/12/22 Michal Marek <mmarek@...e.cz>:
> On 22.12.2010 20:57, dirk.brandewie@...il.com wrote:
>>
>> From: Dirk Brandewie<dirk.brandewie@...il.com>
>>
>> This patch adds support for linking device tree blob(s) into
>> vmlinux. Modifies asm-generic/vmlinux.lds.h to add linking
>> .dtb sections into vmlinux. To maintain compatiblity with the of/fdt
>> driver code platforms MUST copy the blob to a non-init memory location
>> before the kernel frees the .init.* sections in the image.
>>
>> Modifies scripts/Makefile.lib to add a kbuild command to
>> compile DTS files to device tree blobs and a rule to create objects to
>> wrap the blobs for linking.
>>
>> STRUCT_ALIGNMENT is defined in vmlinux.lds.h for use in the rule to
>> create wrapper objects for the dtb in Makefile.lib.  The
>> STRUCT_ALIGN() macro in vmlinux.lds.h is modified to use the
>> STRUCT_ALIGNMENT definition.
>>
>> The DTB's are placed on 32 byte boundries to allow parsing the blob
>> with driver/of/fdt.c during early boot without having to copy the blob
>> to get the structure alignment GCC expects.
>>
>> A DTB is linked in by adding the DTB object to the list of objects to
>> be linked into vmlinux in the archtecture specific Makefile using
>>    obj-y += foo.dtb.o
>>
>> Signed-off-by: Dirk Brandewie<dirk.brandewie@...il.com>
>
> Hi,
>
> you can add
> Acked-by: Michal Marek <mmarek@...e.cz>
> but I thing this series should go through the tip tree, as your primary
> target seems to be x86 and patch 2/4 depends on the ce4100 code that is only
> in tip.

If the two lines

+# device tree blob
+obj-$(CONFIG_X86_INTEL_CE) += ce4100.dtb.o

are removed, patch 2/4 no longer depends on the ce4100 code.
The summary and description for that patch don't mention anything
about ce4100 anyway.

Gr{oetje,eeting}s,

                        Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds
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