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Date: Wed, 21 Oct 2020 08:45:18 +0200 From: Mauro Carvalho Chehab <mchehab+huawei@...nel.org> To: Rob Herring <robh@...nel.org> Cc: devicetree@...r.kernel.org, linux-kernel@...r.kernel.org, Frank Rowand <frowand.list@...il.com>, Geert Uytterhoeven <geert+renesas@...der.be>, Michael Ellerman <mpe@...erman.id.au>, Thomas Bogendoerfer <tsbogend@...ha.franken.de>, Jonathan Corbet <corbet@....net>, Paul Mackerras <paulus@...ba.org>, Yoshinori Sato <ysato@...rs.sourceforge.jp>, Rich Felker <dalias@...c.org>, Thomas Gleixner <tglx@...utronix.de>, Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>, "H. Peter Anvin" <hpa@...or.com>, x86@...nel.org, linuxppc-dev@...ts.ozlabs.org, linux-mips@...r.kernel.org, linux-doc@...r.kernel.org, linux-sh@...r.kernel.org, Benjamin Herrenschmidt <benh@...nel.crashing.org> Subject: Re: [PATCH 2/2] dt: Remove booting-without-of.rst Hi Rob, Em Thu, 8 Oct 2020 09:24:20 -0500 Rob Herring <robh@...nel.org> escreveu: > booting-without-of.rstt is an ancient document that first outlined > Flattened DeviceTree on PowerPC initially. The DT world has evolved a > lot in the 15 years since and booting-without-of.rst is pretty stale. > The name of the document itself is confusing if you don't understand the > evolution from real 'OpenFirmware'. Most of what booting-without-of.rst > contains is now in the DT specification (which evolved out of the > ePAPR). The few things that weren't documented in the DT specification > are now. > > All that remains is the boot entry details, so let's move these to arch > specific documents. The exception is arm which already has the same > details documented. Removing this document caused a warning at Documentation/arm/booting.rst: $ ./scripts/documentation-file-ref-check Documentation/arm/booting.rst: Documentation/devicetree/booting-without-of.rst as it mentions that the DTB format is described on booting-without-of.rst: 4b. Setup the device tree ------------------------- The boot loader must load a device tree image (dtb) into system ram at a 64bit aligned address and initialize it with the boot data. The dtb format is documented in Documentation/devicetree/booting-without-of.rst. The kernel will look for the dtb magic value of 0xd00dfeed at the dtb physical address to determine if a dtb has been passed instead of a tagged list. So, I guess that such part of the document needs to be moved to booting.rst. Thanks, Mauro
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