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From: Marek Vasut <marek.vasut-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
To: Frank Rowand
	<frowand.list-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>,
	David Gibson
	<david-xT8FGy+AXnRB3Ne2BGzF6laj5H9X9Tb+@public.gmane.org>,
	Rob Herring <robh+dt-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>
Cc: Devicetree Compiler
	<devicetree-compiler-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>,
	"devicetree-spec-u79uwXL29TY76Z2rM5mHXA@public.gmane.org"
	<devicetree-spec-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>,
	Jon Loeliger <jdl-CYoMK+44s/E@public.gmane.org>,
	"devicetree-u79uwXL29TY76Z2rM5mHXA@public.gmane.org"
	<devicetree-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>,
	Pantelis Antoniou
	<pantelis.antoniou-OWPKS81ov/FWk0Htik3J/w@public.gmane.org>,
	"Pantelis
	Antomarek.vasut-Re5JQEeQqe/2sr8fMPgRzw@public.gmane.org"
	<panto-wVdstyuyKrO8r51toPun2/C9HSW9iNxf@public.gmane.org>,
	Grant Likely
	<grant.likely-s3s/WqlpOiPyB63q8FvJNQ@public.gmane.org>,
	Tom Rini <trini-OWPKS81ov/FWk0Htik3J/w@public.gmane.org>,
	Kyle Evans <kevans-h+KGxgPPiopAfugRpC6u6w@public.gmane.org>,
	Geert Uytterhoeven
	<geert-Td1EMuHUCqxL1ZNQvxDV9g@public.gmane.org>,
	Alan Tull <atull-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>,
	Michael Ellerman <mpe-Gsx/Oe8HsFggBc27wqDAHg@public.gmane.org>
Subject: Re: [RFC] devicetree: new FDT format version
Date: Thu, 25 Jan 2018 10:14:38 +0100	[thread overview]
Message-ID: <90983180-ae3b-5a31-9dc0-b62b978a0fba@gmail.com> (raw)
In-Reply-To: <20328477-e511-e875-7dc4-253640f2219e-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>

On 01/23/2018 10:17 PM, Frank Rowand wrote:
[...]
> My knowledge of bootloader use of the FDT is nearly non-existent, so
> I'm on thin ice here.  But I am guessing that a lot of bootloader
> processing of FDT data could be removed if the kernel would unflatten
> a chained FDT and overlay FDT(s).
> 
> Comments from the bootloader folks on this topic would be much
> appreciated.

U-Boot, when using DT as a hardware-description (rather than just
passing it to Linux) usually operates on the FDT, unless explicitly
configured to unflatten the tree. That later option is not enabled by
default.

The reason for that is so that the DT can be accessed very early on, at
which point there may not be any other memory available than a very
limited stack and the FDT blob can still be located in some read-only
memory.

-- 
Best regards,
Marek Vasut
--
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  parent reply	other threads:[~2018-01-25  9:14 UTC|newest]

Thread overview: 33+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-01-22  8:09 Frank Rowand
     [not found] ` <b96829f9-2e8b-fdc5-5090-58591e2260cf-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
2018-01-22  8:14   ` Frank Rowand
     [not found]     ` <ec68cfb3-4702-ba00-e926-3ad63b20b199-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
2018-01-22 20:08       ` Frank Rowand
2018-01-22 20:08   ` Frank Rowand
     [not found]     ` <bc44f051-835d-1c8d-a928-be0fd4ef80b5-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
2018-01-25  0:27       ` Frank Rowand
     [not found]         ` <b5a72db1-45b2-f21f-9afd-0991b288840e-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
2018-01-27  8:48           ` David Gibson
2018-01-29  8:08             ` Frank Rowand
     [not found]               ` <2c352396-154e-ea75-c50b-0f2bfafd19da-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
2018-01-29 10:56                 ` David Gibson
2018-01-30  1:29                   ` Frank Rowand
2018-01-22 21:01   ` Rob Herring
     [not found]     ` <CAL_JsqJR2y7bMw_-9TBAGWZ_kf7_sZo5qvqvRowJ8jiy=4G0Bg-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2018-01-23 12:42       ` David Gibson
2018-01-23 21:17         ` Frank Rowand
     [not found]           ` <20328477-e511-e875-7dc4-253640f2219e-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
2018-01-24 15:47             ` Rob Herring
     [not found]               ` <CAL_Jsq+fvFrGhqO0zbEUE_i23FkU=G4Z1-e0vnXHi4KbS2oK0A-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2018-01-24 21:16                 ` Frank Rowand
     [not found]                   ` <e1bec77d-4dac-200b-34be-23573bf738f0-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
2018-01-24 22:27                     ` Alan Tull
2018-01-25  0:22                     ` Frank Rowand
     [not found]                       ` <e986435b-481b-2629-7600-10d9e21ac58e-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
2018-01-25 12:29                         ` David Gibson
2018-01-25 20:01                           ` Frank Rowand
     [not found]                             ` <72d30756-a963-92c9-1838-3e3f80c57e39-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
2018-01-29 18:32                               ` Grant Likely
     [not found]                                 ` <CACxGe6tUB3NhNhOtqzoJfThx=RE1_=TSDQz+wQUm=sdE5JirZQ-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2018-01-29 23:15                                   ` David Gibson
2018-01-26  8:56                           ` Geert Uytterhoeven
     [not found]                             ` <CAMuHMdV0jdj90uzqMx_wtvz=-KaagJG2_UQTm1DW3gzt6cNG6A-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2018-01-26  8:59                               ` Geert Uytterhoeven
2018-01-26 22:08                               ` Frank Rowand
     [not found]                                 ` <83008da0-7383-ba2d-a239-e11ad7d1327d-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
2018-01-27  9:00                                   ` David Gibson
2018-01-27  8:56                               ` David Gibson
2018-01-25 23:11                     ` Frank Rowand
2018-01-25 12:22                 ` David Gibson
2018-01-25  9:14             ` Marek Vasut [this message]
     [not found]               ` <90983180-ae3b-5a31-9dc0-b62b978a0fba-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
2018-01-25 12:37                 ` David Gibson
2018-01-27 20:30                   ` Marek Vasut
     [not found]                     ` <5a943937-3b59-514b-3939-df25daea5470-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
2018-01-29  0:53                       ` David Gibson
2018-01-23 12:05   ` David Gibson
2018-01-23 21:28     ` Frank Rowand

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