[{"id":1764315,"web_url":"http://patchwork.ozlabs.org/comment/1764315/","msgid":"<49fedf05-4896-3105-f143-d24db31f6182@denx.de>","list_archive_url":null,"date":"2017-09-06T19:06:21","subject":"Re: [U-Boot] [PATCH v3 08/14] fit: fdt overlays doc","submitter":{"id":70701,"url":"http://patchwork.ozlabs.org/api/people/70701/","name":"Lukasz Majewski","email":"lukma@denx.de"},"content":"On 09/04/2017 10:12 PM, Pantelis Antoniou wrote:\n> Signed-off-by: Pantelis Antoniou \n> ---\n> doc/uImage.FIT/command_syntax_extensions.txt | 12 +-\n> doc/uImage.FIT/overlay-fdt-boot.txt | 221 +++++++++++++++++++++++++++\n> doc/uImage.FIT/source_file_format.txt | 6 +-\n> 3 files changed, 236 insertions(+), 3 deletions(-)\n> create mode 100644 doc/uImage.FIT/overlay-fdt-boot.txt\n> \n> diff --git a/doc/uImage.FIT/command_syntax_extensions.txt b/doc/uImage.FIT/command_syntax_extensions.txt\n> index 6c99b1c..676f992 100644\n> --- a/doc/uImage.FIT/command_syntax_extensions.txt\n> +++ b/doc/uImage.FIT/command_syntax_extensions.txt\n> @@ -36,7 +36,7 @@ Old uImage:\n> New uImage:\n> 8. bootm \n> 9. bootm []:\n> -10. bootm []#\n> +10. bootm []#[# 11. bootm []: []:\n> 12. bootm []: []: []:\n> 13. bootm []: []: \n> @@ -129,6 +129,12 @@ following syntax:\n> - new uImage configuration specification\n> #\n> \n> +- new uImage configuration specification with extra configuration components\n> +#[#[#..]]\n> +\n> +The extra configuration currently is supported only for additional device tree\n> +overlays to apply on the base device tree supplied by the first configuration\n> +unit.\n> \n> Examples:\n> \n> @@ -138,6 +144,10 @@ bootm 200000:kernel@1\n> - boot configuration \"cfg@1\" from a new uImage located at 200000:\n> bootm 200000#cfg@1\n> \n> +- boot configuration \"cfg@1\" with extra \"cfg@2\" from a new uImage located\n> + at 200000:\n> +bootm 200000#cfg@1#cfg@2\n> +\n> - boot \"kernel@1\" from a new uImage at 200000 with initrd \"ramdisk@2\" found in\n> some other new uImage stored at address 800000:\n> bootm 200000:kernel@1 800000:ramdisk@2\n> diff --git a/doc/uImage.FIT/overlay-fdt-boot.txt b/doc/uImage.FIT/overlay-fdt-boot.txt\n> new file mode 100644\n> index 0000000..dbdf2a1\n> --- /dev/null\n> +++ b/doc/uImage.FIT/overlay-fdt-boot.txt\n> @@ -0,0 +1,221 @@\n> +U-Boot FDT Overlay usage\n> +========================\n> +\n> +Introduction\n> +------------\n> +In many cases it is desirable to have a single FIT image support a multitude\n> +of similar boards and their expansion options. The same kernel on DT enabled\n> +platforms can support this easily enough by providing a DT blob upon boot\n> +that matches the desired configuration.\n> +\n> +Configuration without overlays\n> +------------------------------\n> +\n> +Take a hypothetical board named 'foo' where there are different supported\n> +revisions, reva and revb. Assume that both board revisions can use add a bar\n> +add-on board, while only the revb board can use a baz add-on board.\n> +\n> +Without using overlays the configuration would be as follows for every case.\n> +\n> +\t/dts-v1/;\n> +\t/ {\n> +\t\timages {\n> +\t\t\tkernel@1 {\n> +\t\t\t\tdata = /incbin/(\"./zImage\");\n> +\t\t\t\ttype = \"kernel\";\n> +\t\t\t\tarch = \"arm\";\n> +\t\t\t\tos = \"linux\";\n> +\t\t\t\tload = <0x82000000>;\n> +\t\t\t\tentry = <0x82000000>;\n> +\t\t\t};\n> +\t\t\tfdt@1 {\n> +\t\t\t\tdata = /incbin/(\"./foo-reva.dtb\");\n> +\t\t\t\ttype = \"flat_dt\";\n> +\t\t\t\tarch = \"arm\";\n> +\t\t\t};\n> +\t\t\tfdt@2 {\n> +\t\t\t\tdata = /incbin/(\"./foo-revb.dtb\");\n> +\t\t\t\ttype = \"flat_dt\";\n> +\t\t\t\tarch = \"arm\";\n> +\t\t\t};\n> +\t\t\tfdt@3 {\n> +\t\t\t\tdata = /incbin/(\"./foo-reva-bar.dtb\");\n> +\t\t\t\ttype = \"flat_dt\";\n> +\t\t\t\tarch = \"arm\";\n> +\t\t\t};\n> +\t\t\tfdt@4 {\n> +\t\t\t\tdata = /incbin/(\"./foo-revb-bar.dtb\");\n> +\t\t\t\ttype = \"flat_dt\";\n> +\t\t\t\tarch = \"arm\";\n> +\t\t\t};\n> +\t\t\tfdt@5 {\n> +\t\t\t\tdata = /incbin/(\"./foo-revb-baz.dtb\");\n> +\t\t\t\ttype = \"flat_dt\";\n> +\t\t\t\tarch = \"arm\";\n> +\t\t\t};\n> +\t\t\tfdt@6 {\n> +\t\t\t\tdata = /incbin/(\"./foo-revb-bar-baz.dtb\");\n> +\t\t\t\ttype = \"flat_dt\";\n> +\t\t\t\tarch = \"arm\";\n> +\t\t\t};\n> +\t\t};\n> +\n> +\t\tconfigurations {\n> +\t\t\tdefault = \"foo-reva.dtb;\n> +\t\t\tfoo-reva.dtb {\n> +\t\t\t\tkernel = \"kernel@1\";\n> +\t\t\t\tfdt = \"fdt@1\";\n> +\t\t\t};\n> +\t\t\tfoo-revb.dtb {\n> +\t\t\t\tkernel = \"kernel@1\";\n> +\t\t\t\tfdt = \"fdt@2\";\n> +\t\t\t};\n> +\t\t\tfoo-reva-bar.dtb {\n> +\t\t\t\tkernel = \"kernel@1\";\n> +\t\t\t\tfdt = \"fdt@3\";\n> +\t\t\t};\n> +\t\t\tfoo-revb-bar.dtb {\n> +\t\t\t\tkernel = \"kernel@1\";\n> +\t\t\t\tfdt = \"fdt@4\";\n> +\t\t\t};\n> +\t\t\tfoo-revb-baz.dtb {\n> +\t\t\t\tkernel = \"kernel@1\";\n> +\t\t\t\tfdt = \"fdt@5\";\n> +\t\t\t};\n> +\t\t\tfoo-revb-bar-baz.dtb {\n> +\t\t\t\tkernel = \"kernel@1\";\n> +\t\t\t\tfdt = \"fdt@6\";\n> +\t\t\t};\n> +\t\t};\n> +\t};\n> +\n> +Note the blob needs to be compiled for each case and the combinatorial explosion of\n> +configurations. A typical device tree blob is in the low hunderds of kbytes so a\n> +multitude of configuration grows the image quite a bit.\n> +\n> +Booting this image is done by using\n> +\n> +\t# bootm #\n> +\n> +Where config is one of:\n> +\tfoo-reva.dtb, foo-revb.dtb, foo-reva-bar.dtb, foo-revb-bar.dtb,\n> +\tfoo-revb-baz.dtb, foo-revb-bar-baz.dtb\n> +\n> +This selects the DTB to use when booting.\n> +\n> +Configuration using overlays\n> +----------------------------\n> +\n> +Device tree overlays can be applied to a base DT and result in the same blob\n> +being passed to the booting kernel. This saves on space and avoid the combinatorial\n> +explosion problem.\n> +\n> +\t/dts-v1/;\n> +\t/ {\n> +\t\timages {\n> +\t\t\tkernel@1 {\n> +\t\t\t\tdata = /incbin/(\"./zImage\");\n> +\t\t\t\ttype = \"kernel\";\n> +\t\t\t\tarch = \"arm\";\n> +\t\t\t\tos = \"linux\";\n> +\t\t\t\tload = <0x82000000>;\n> +\t\t\t\tentry = <0x82000000>;\n> +\t\t\t};\n> +\t\t\tfdt@1 {\n> +\t\t\t\tdata = /incbin/(\"./foo.dtb\");\n> +\t\t\t\ttype = \"flat_dt\";\n> +\t\t\t\tarch = \"arm\";\n> +\t\t\t\tload = <0x87f00000>;\n> +\t\t\t};\n> +\t\t\tfdt@2 {\n> +\t\t\t\tdata = /incbin/(\"./reva.dtbo\");\n> +\t\t\t\ttype = \"flat_dt\";\n> +\t\t\t\tarch = \"arm\";\n> +\t\t\t\tload = <0x87fc0000>;\n> +\t\t\t};\n> +\t\t\tfdt@3 {\n> +\t\t\t\tdata = /incbin/(\"./revb.dtbo\");\n> +\t\t\t\ttype = \"flat_dt\";\n> +\t\t\t\tarch = \"arm\";\n> +\t\t\t\tload = <0x87fc0000>;\n> +\t\t\t};\n> +\t\t\tfdt@4 {\n> +\t\t\t\tdata = /incbin/(\"./bar.dtbo\");\n> +\t\t\t\ttype = \"flat_dt\";\n> +\t\t\t\tarch = \"arm\";\n> +\t\t\t\tload = <0x87fc0000>;\n> +\t\t\t};\n> +\t\t\tfdt@5 {\n> +\t\t\t\tdata = /incbin/(\"./baz.dtbo\");\n> +\t\t\t\ttype = \"flat_dt\";\n> +\t\t\t\tarch = \"arm\";\n> +\t\t\t\tload = <0x87fc0000>;\n> +\t\t\t};\n> +\t\t};\n> +\n> +\t\tconfigurations {\n> +\t\t\tdefault = \"foo-reva.dtb;\n> +\t\t\tfoo-reva.dtb {\n> +\t\t\t\tkernel = \"kernel@1\";\n> +\t\t\t\tfdt = \"fdt@1\", \"fdt@2\";\n> +\t\t\t};\n> +\t\t\tfoo-revb.dtb {\n> +\t\t\t\tkernel = \"kernel@1\";\n> +\t\t\t\tfdt = \"fdt@1\", \"fdt@3\";\n> +\t\t\t};\n> +\t\t\tfoo-reva-bar.dtb {\n> +\t\t\t\tkernel = \"kernel@1\";\n> +\t\t\t\tfdt = \"fdt@1\", \"fdt@2\", \"fdt@4\";\n> +\t\t\t};\n> +\t\t\tfoo-revb-bar.dtb {\n> +\t\t\t\tkernel = \"kernel@1\";\n> +\t\t\t\tfdt = \"fdt@1\", \"fdt@3\", \"fdt@4\";\n> +\t\t\t};\n> +\t\t\tfoo-revb-baz.dtb {\n> +\t\t\t\tkernel = \"kernel@1\";\n> +\t\t\t\tfdt = \"fdt@1\", \"fdt@3\", \"fdt@5\";\n> +\t\t\t};\n> +\t\t\tfoo-revb-bar-baz.dtb {\n> +\t\t\t\tkernel = \"kernel@1\";\n> +\t\t\t\tfdt = \"fdt@1\", \"fdt@3\", \"fdt@4\", \"fdt@5\";\n> +\t\t\t};\n> +\t\t\tbar {\n> +\t\t\t\tfdt = \"fdt@4\";\n> +\t\t\t};\n> +\t\t\tbaz {\n> +\t\t\t\tfdt = \"fdt@5\";\n> +\t\t\t};\n> +\t\t};\n> +\t};\n> +\n> +Booting this image is exactly the same as the non-overlay example.\n> +u-boot will retrieve the base blob and apply the overlays in sequence as\n> +they are declared in the configuration.\n> +\n> +Note the minimum amount of different DT blobs, as well as the requirement for\n> +the DT blobs to have a load address; the overlay application requires the blobs\n> +to be writeable.\n> +\n> +Configuration using overlays and feature selection\n> +--------------------------------------------------\n> +\n> +Although the configuration in the previous section works is a bit inflexible\n> +since it requires all possible configuration options to be laid out before\n> +hand in the FIT image. For the add-on boards the extra config selection method\n> +might make sense.\n> +\n> +Note the two bar & baz configuration nodes. To boot a reva board with\n> +the bar add-on board enabled simply use:\n> +\n> +\t# bootm #foo-reva.dtb#bar\n> +\n> +While booting a revb with bar and baz is as follows:\n> +\n> +\t# bootm #foo-revb.dtb#bar#baz\n> +\n> +The limitation for a feature selection configuration node is that a single\n> +fdt option is currently supported.\n> +\n> +Pantelis Antoniou\n> +pantelis.antoniou@konsulko.com\n> +12/6/2017\n> diff --git a/doc/uImage.FIT/source_file_format.txt b/doc/uImage.FIT/source_file_format.txt\n> index 136d3d7..ba8013a 100644\n> --- a/doc/uImage.FIT/source_file_format.txt\n> +++ b/doc/uImage.FIT/source_file_format.txt\n> @@ -235,7 +235,7 @@ o config@1\n> |- description = \"configuration description\"\n> |- kernel = \"kernel sub-node unit name\"\n> |- ramdisk = \"ramdisk sub-node unit name\"\n> - |- fdt = \"fdt sub-node unit-name\"\n> + |- fdt = \"fdt sub-node unit-name\" [, \"fdt overlay sub-node unit-name\", ...]\n> |- fpga = \"fpga sub-node unit-name\"\n> |- loadables = \"loadables sub-node unit-name\"\n> \n> @@ -249,7 +249,9 @@ o config@1\n> - ramdisk : Unit name of the corresponding ramdisk image (component image\n> node of a \"ramdisk\" type).\n> - fdt : Unit name of the corresponding fdt blob (component image node of a\n> - \"fdt type\").\n> + \"fdt type\"). Additional fdt overlay nodes can be supplied which signify\n> + that the resulting device tree blob is generated by the first base fdt\n> + blob with all subsequent overlays applied.\n> - setup : Unit name of the corresponding setup binary (used for booting\n> an x86 kernel). This contains the setup.bin file built by the kernel.\n> - fpga : Unit name of the corresponding fpga bitstream blob\n> \n\nReviewed-by: Łukasz Majewski\n\n\nI'm just curious - what was the fit image size reduction on your test setup?","headers":{"Return-Path":"","X-Original-To":"incoming@patchwork.ozlabs.org","Delivered-To":"patchwork-incoming@bilbo.ozlabs.org","Authentication-Results":"ozlabs.org;\n\tspf=none (mailfrom) smtp.mailfrom=lists.denx.de\n\t(client-ip=81.169.180.215; helo=lists.denx.de;\n\tenvelope-from=u-boot-bounces@lists.denx.de;\n\treceiver=)","Received":["from lists.denx.de (dione.denx.de [81.169.180.215])\n\tby ozlabs.org (Postfix) with ESMTP id 3xnY3L6YfGz9t2R\n\tfor ;\n\tThu, 7 Sep 2017 05:06:37 +1000 (AEST)","by lists.denx.de (Postfix, from userid 105)\n\tid 06AA0C21F3C; Wed, 6 Sep 2017 19:06:30 +0000 (UTC)","from lists.denx.de (localhost [IPv6:::1])\n\tby lists.denx.de (Postfix) with ESMTP id 11747C21DB5;\n\tWed, 6 Sep 2017 19:06:27 +0000 (UTC)","by lists.denx.de (Postfix, from userid 105)\n\tid 53E47C21DB5; 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Linux x86_64; rv:52.0) Gecko/20100101\n\tThunderbird/52.2.1","MIME-Version":"1.0","In-Reply-To":"<1504555943-12893-9-git-send-email-pantelis.antoniou@konsulko.com>","Content-Language":"en-US","Cc":"Marek Vasut , Tero Kristo ,\n\tu-boot@lists.denx.de, Maxime Ripard ,\n\tStefan Roese , Alan Ott ","Subject":"Re: [U-Boot] [PATCH v3 08/14] fit: fdt overlays doc","X-BeenThere":"u-boot@lists.denx.de","X-Mailman-Version":"2.1.18","Precedence":"list","List-Id":"U-Boot discussion ","List-Unsubscribe":",\n\t","List-Archive":"","List-Post":"","List-Help":"","List-Subscribe":",\n\t","Content-Transfer-Encoding":"base64","Content-Type":"text/plain; charset=\"utf-8\"; Format=\"flowed\"","Errors-To":"u-boot-bounces@lists.denx.de","Sender":"\"U-Boot\" "}},{"id":1764536,"web_url":"http://patchwork.ozlabs.org/comment/1764536/","msgid":"<1504767130.23573.14.camel@hp800z>","list_archive_url":null,"date":"2017-09-07T06:52:10","subject":"Re: [U-Boot] [PATCH v3 08/14] fit: fdt overlays doc","submitter":{"id":64098,"url":"http://patchwork.ozlabs.org/api/people/64098/","name":"Pantelis Antoniou","email":"pantelis.antoniou@konsulko.com"},"content":"Hi Lukasz,\n\nOn Wed, 2017-09-06 at 21:06 +0200, Łukasz Majewski wrote:\n> On 09/04/2017 10:12 PM, Pantelis Antoniou wrote:\n> > Signed-off-by: Pantelis Antoniou \n> > ---\n> > doc/uImage.FIT/command_syntax_extensions.txt | 12 +-\n> > doc/uImage.FIT/overlay-fdt-boot.txt | 221 +++++++++++++++++++++++++++\n> > doc/uImage.FIT/source_file_format.txt | 6 +-\n> > 3 files changed, 236 insertions(+), 3 deletions(-)\n> > create mode 100644 doc/uImage.FIT/overlay-fdt-boot.txt\n> > \n> > diff --git a/doc/uImage.FIT/command_syntax_extensions.txt b/doc/uImage.FIT/command_syntax_extensions.txt\n> > index 6c99b1c..676f992 100644\n> > --- a/doc/uImage.FIT/command_syntax_extensions.txt\n> > +++ b/doc/uImage.FIT/command_syntax_extensions.txt\n> > @@ -36,7 +36,7 @@ Old uImage:\n> > New uImage:\n> > 8. bootm \n> > 9. bootm []:\n> > -10. bootm []#\n> > +10. bootm []#[# > 11. bootm []: []:\n> > 12. bootm []: []: []:\n> > 13. bootm []: []: \n> > @@ -129,6 +129,12 @@ following syntax:\n> > - new uImage configuration specification\n> > #\n> > \n> > +- new uImage configuration specification with extra configuration components\n> > +#[#[#..]]\n> > +\n> > +The extra configuration currently is supported only for additional device tree\n> > +overlays to apply on the base device tree supplied by the first configuration\n> > +unit.\n> > \n> > Examples:\n> > \n> > @@ -138,6 +144,10 @@ bootm 200000:kernel@1\n> > - boot configuration \"cfg@1\" from a new uImage located at 200000:\n> > bootm 200000#cfg@1\n> > \n> > +- boot configuration \"cfg@1\" with extra \"cfg@2\" from a new uImage located\n> > + at 200000:\n> > +bootm 200000#cfg@1#cfg@2\n> > +\n> > - boot \"kernel@1\" from a new uImage at 200000 with initrd \"ramdisk@2\" found in\n> > some other new uImage stored at address 800000:\n> > bootm 200000:kernel@1 800000:ramdisk@2\n> > diff --git a/doc/uImage.FIT/overlay-fdt-boot.txt b/doc/uImage.FIT/overlay-fdt-boot.txt\n> > new file mode 100644\n> > index 0000000..dbdf2a1\n> > --- /dev/null\n> > +++ b/doc/uImage.FIT/overlay-fdt-boot.txt\n> > @@ -0,0 +1,221 @@\n> > +U-Boot FDT Overlay usage\n> > +========================\n> > +\n> > +Introduction\n> > +------------\n> > +In many cases it is desirable to have a single FIT image support a multitude\n> > +of similar boards and their expansion options. The same kernel on DT enabled\n> > +platforms can support this easily enough by providing a DT blob upon boot\n> > +that matches the desired configuration.\n> > +\n> > +Configuration without overlays\n> > +------------------------------\n> > +\n> > +Take a hypothetical board named 'foo' where there are different supported\n> > +revisions, reva and revb. Assume that both board revisions can use add a bar\n> > +add-on board, while only the revb board can use a baz add-on board.\n> > +\n> > +Without using overlays the configuration would be as follows for every case.\n> > +\n> > +\t/dts-v1/;\n> > +\t/ {\n> > +\t\timages {\n> > +\t\t\tkernel@1 {\n> > +\t\t\t\tdata = /incbin/(\"./zImage\");\n> > +\t\t\t\ttype = \"kernel\";\n> > +\t\t\t\tarch = \"arm\";\n> > +\t\t\t\tos = \"linux\";\n> > +\t\t\t\tload = <0x82000000>;\n> > +\t\t\t\tentry = <0x82000000>;\n> > +\t\t\t};\n> > +\t\t\tfdt@1 {\n> > +\t\t\t\tdata = /incbin/(\"./foo-reva.dtb\");\n> > +\t\t\t\ttype = \"flat_dt\";\n> > +\t\t\t\tarch = \"arm\";\n> > +\t\t\t};\n> > +\t\t\tfdt@2 {\n> > +\t\t\t\tdata = /incbin/(\"./foo-revb.dtb\");\n> > +\t\t\t\ttype = \"flat_dt\";\n> > +\t\t\t\tarch = \"arm\";\n> > +\t\t\t};\n> > +\t\t\tfdt@3 {\n> > +\t\t\t\tdata = /incbin/(\"./foo-reva-bar.dtb\");\n> > +\t\t\t\ttype = \"flat_dt\";\n> > +\t\t\t\tarch = \"arm\";\n> > +\t\t\t};\n> > +\t\t\tfdt@4 {\n> > +\t\t\t\tdata = /incbin/(\"./foo-revb-bar.dtb\");\n> > +\t\t\t\ttype = \"flat_dt\";\n> > +\t\t\t\tarch = \"arm\";\n> > +\t\t\t};\n> > +\t\t\tfdt@5 {\n> > +\t\t\t\tdata = /incbin/(\"./foo-revb-baz.dtb\");\n> > +\t\t\t\ttype = \"flat_dt\";\n> > +\t\t\t\tarch = \"arm\";\n> > +\t\t\t};\n> > +\t\t\tfdt@6 {\n> > +\t\t\t\tdata = /incbin/(\"./foo-revb-bar-baz.dtb\");\n> > +\t\t\t\ttype = \"flat_dt\";\n> > +\t\t\t\tarch = \"arm\";\n> > +\t\t\t};\n> > +\t\t};\n> > +\n> > +\t\tconfigurations {\n> > +\t\t\tdefault = \"foo-reva.dtb;\n> > +\t\t\tfoo-reva.dtb {\n> > +\t\t\t\tkernel = \"kernel@1\";\n> > +\t\t\t\tfdt = \"fdt@1\";\n> > +\t\t\t};\n> > +\t\t\tfoo-revb.dtb {\n> > +\t\t\t\tkernel = \"kernel@1\";\n> > +\t\t\t\tfdt = \"fdt@2\";\n> > +\t\t\t};\n> > +\t\t\tfoo-reva-bar.dtb {\n> > +\t\t\t\tkernel = \"kernel@1\";\n> > +\t\t\t\tfdt = \"fdt@3\";\n> > +\t\t\t};\n> > +\t\t\tfoo-revb-bar.dtb {\n> > +\t\t\t\tkernel = \"kernel@1\";\n> > +\t\t\t\tfdt = \"fdt@4\";\n> > +\t\t\t};\n> > +\t\t\tfoo-revb-baz.dtb {\n> > +\t\t\t\tkernel = \"kernel@1\";\n> > +\t\t\t\tfdt = \"fdt@5\";\n> > +\t\t\t};\n> > +\t\t\tfoo-revb-bar-baz.dtb {\n> > +\t\t\t\tkernel = \"kernel@1\";\n> > +\t\t\t\tfdt = \"fdt@6\";\n> > +\t\t\t};\n> > +\t\t};\n> > +\t};\n> > +\n> > +Note the blob needs to be compiled for each case and the combinatorial explosion of\n> > +configurations. A typical device tree blob is in the low hunderds of kbytes so a\n> > +multitude of configuration grows the image quite a bit.\n> > +\n> > +Booting this image is done by using\n> > +\n> > +\t# bootm #\n> > +\n> > +Where config is one of:\n> > +\tfoo-reva.dtb, foo-revb.dtb, foo-reva-bar.dtb, foo-revb-bar.dtb,\n> > +\tfoo-revb-baz.dtb, foo-revb-bar-baz.dtb\n> > +\n> > +This selects the DTB to use when booting.\n> > +\n> > +Configuration using overlays\n> > +----------------------------\n> > +\n> > +Device tree overlays can be applied to a base DT and result in the same blob\n> > +being passed to the booting kernel. This saves on space and avoid the combinatorial\n> > +explosion problem.\n> > +\n> > +\t/dts-v1/;\n> > +\t/ {\n> > +\t\timages {\n> > +\t\t\tkernel@1 {\n> > +\t\t\t\tdata = /incbin/(\"./zImage\");\n> > +\t\t\t\ttype = \"kernel\";\n> > +\t\t\t\tarch = \"arm\";\n> > +\t\t\t\tos = \"linux\";\n> > +\t\t\t\tload = <0x82000000>;\n> > +\t\t\t\tentry = <0x82000000>;\n> > +\t\t\t};\n> > +\t\t\tfdt@1 {\n> > +\t\t\t\tdata = /incbin/(\"./foo.dtb\");\n> > +\t\t\t\ttype = \"flat_dt\";\n> > +\t\t\t\tarch = \"arm\";\n> > +\t\t\t\tload = <0x87f00000>;\n> > +\t\t\t};\n> > +\t\t\tfdt@2 {\n> > +\t\t\t\tdata = /incbin/(\"./reva.dtbo\");\n> > +\t\t\t\ttype = \"flat_dt\";\n> > +\t\t\t\tarch = \"arm\";\n> > +\t\t\t\tload = <0x87fc0000>;\n> > +\t\t\t};\n> > +\t\t\tfdt@3 {\n> > +\t\t\t\tdata = /incbin/(\"./revb.dtbo\");\n> > +\t\t\t\ttype = \"flat_dt\";\n> > +\t\t\t\tarch = \"arm\";\n> > +\t\t\t\tload = <0x87fc0000>;\n> > +\t\t\t};\n> > +\t\t\tfdt@4 {\n> > +\t\t\t\tdata = /incbin/(\"./bar.dtbo\");\n> > +\t\t\t\ttype = \"flat_dt\";\n> > +\t\t\t\tarch = \"arm\";\n> > +\t\t\t\tload = <0x87fc0000>;\n> > +\t\t\t};\n> > +\t\t\tfdt@5 {\n> > +\t\t\t\tdata = /incbin/(\"./baz.dtbo\");\n> > +\t\t\t\ttype = \"flat_dt\";\n> > +\t\t\t\tarch = \"arm\";\n> > +\t\t\t\tload = <0x87fc0000>;\n> > +\t\t\t};\n> > +\t\t};\n> > +\n> > +\t\tconfigurations {\n> > +\t\t\tdefault = \"foo-reva.dtb;\n> > +\t\t\tfoo-reva.dtb {\n> > +\t\t\t\tkernel = \"kernel@1\";\n> > +\t\t\t\tfdt = \"fdt@1\", \"fdt@2\";\n> > +\t\t\t};\n> > +\t\t\tfoo-revb.dtb {\n> > +\t\t\t\tkernel = \"kernel@1\";\n> > +\t\t\t\tfdt = \"fdt@1\", \"fdt@3\";\n> > +\t\t\t};\n> > +\t\t\tfoo-reva-bar.dtb {\n> > +\t\t\t\tkernel = \"kernel@1\";\n> > +\t\t\t\tfdt = \"fdt@1\", \"fdt@2\", \"fdt@4\";\n> > +\t\t\t};\n> > +\t\t\tfoo-revb-bar.dtb {\n> > +\t\t\t\tkernel = \"kernel@1\";\n> > +\t\t\t\tfdt = \"fdt@1\", \"fdt@3\", \"fdt@4\";\n> > +\t\t\t};\n> > +\t\t\tfoo-revb-baz.dtb {\n> > +\t\t\t\tkernel = \"kernel@1\";\n> > +\t\t\t\tfdt = \"fdt@1\", \"fdt@3\", \"fdt@5\";\n> > +\t\t\t};\n> > +\t\t\tfoo-revb-bar-baz.dtb {\n> > +\t\t\t\tkernel = \"kernel@1\";\n> > +\t\t\t\tfdt = \"fdt@1\", \"fdt@3\", \"fdt@4\", \"fdt@5\";\n> > +\t\t\t};\n> > +\t\t\tbar {\n> > +\t\t\t\tfdt = \"fdt@4\";\n> > +\t\t\t};\n> > +\t\t\tbaz {\n> > +\t\t\t\tfdt = \"fdt@5\";\n> > +\t\t\t};\n> > +\t\t};\n> > +\t};\n> > +\n> > +Booting this image is exactly the same as the non-overlay example.\n> > +u-boot will retrieve the base blob and apply the overlays in sequence as\n> > +they are declared in the configuration.\n> > +\n> > +Note the minimum amount of different DT blobs, as well as the requirement for\n> > +the DT blobs to have a load address; the overlay application requires the blobs\n> > +to be writeable.\n> > +\n> > +Configuration using overlays and feature selection\n> > +--------------------------------------------------\n> > +\n> > +Although the configuration in the previous section works is a bit inflexible\n> > +since it requires all possible configuration options to be laid out before\n> > +hand in the FIT image. For the add-on boards the extra config selection method\n> > +might make sense.\n> > +\n> > +Note the two bar & baz configuration nodes. To boot a reva board with\n> > +the bar add-on board enabled simply use:\n> > +\n> > +\t# bootm #foo-reva.dtb#bar\n> > +\n> > +While booting a revb with bar and baz is as follows:\n> > +\n> > +\t# bootm #foo-revb.dtb#bar#baz\n> > +\n> > +The limitation for a feature selection configuration node is that a single\n> > +fdt option is currently supported.\n> > +\n> > +Pantelis Antoniou\n> > +pantelis.antoniou@konsulko.com\n> > +12/6/2017\n> > diff --git a/doc/uImage.FIT/source_file_format.txt b/doc/uImage.FIT/source_file_format.txt\n> > index 136d3d7..ba8013a 100644\n> > --- a/doc/uImage.FIT/source_file_format.txt\n> > +++ b/doc/uImage.FIT/source_file_format.txt\n> > @@ -235,7 +235,7 @@ o config@1\n> > |- description = \"configuration description\"\n> > |- kernel = \"kernel sub-node unit name\"\n> > |- ramdisk = \"ramdisk sub-node unit name\"\n> > - |- fdt = \"fdt sub-node unit-name\"\n> > + |- fdt = \"fdt sub-node unit-name\" [, \"fdt overlay sub-node unit-name\", ...]\n> > |- fpga = \"fpga sub-node unit-name\"\n> > |- loadables = \"loadables sub-node unit-name\"\n> > \n> > @@ -249,7 +249,9 @@ o config@1\n> > - ramdisk : Unit name of the corresponding ramdisk image (component image\n> > node of a \"ramdisk\" type).\n> > - fdt : Unit name of the corresponding fdt blob (component image node of a\n> > - \"fdt type\").\n> > + \"fdt type\"). Additional fdt overlay nodes can be supplied which signify\n> > + that the resulting device tree blob is generated by the first base fdt\n> > + blob with all subsequent overlays applied.\n> > - setup : Unit name of the corresponding setup binary (used for booting\n> > an x86 kernel). This contains the setup.bin file built by the kernel.\n> > - fpga : Unit name of the corresponding fpga bitstream blob\n> > \n> \n> Reviewed-by: Łukasz Majewski\n> \n> \n> I'm just curious - what was the fit image size reduction on your test setup?\n> \n\nI haven't measured, but it's easy to calculate.\n\nAssume each base blob is B bytes in average with each additional overlay\nbeing Oi extra bytes when included in the base and O bytes (in average)\nwhen compiled as an overlay (with O > Oi, overhead is almost constant -\nO = Oi + C). Then for n cases:\n\nThe size of a non-overlay case is:\n\n Si = (B + Oi) * n = B * n + Oi * n\n\nThe size of an overlay case is\n\n So = B + O * n = B + (Oi + C) * n = B + Oi * n + C * n\n\nThe delta in size is:\n\n d = Si - So = B * n + Qi * n - B - Oi * n - C * n = \n = B * (n - 1) - C * n\n\nFor contemporary device trees (which are in the 140K sizes) and\nthe average overhead at about 200 bytes.\n\n d = 140K * (n - 1) - 200 * n\n\nIt's pretty much a win even at n = 2.\n\nFor example for n = 5 (a common case).\n\n d = 140K * (5 - 1) - 200 * 5 = 559K\n\nIt's not earth-shattering smaller, but it's significant.\n\nRegards\n\n-- Pantelis","headers":{"Return-Path":"","X-Original-To":"incoming@patchwork.ozlabs.org","Delivered-To":"patchwork-incoming@bilbo.ozlabs.org","Authentication-Results":["ozlabs.org;\n\tspf=none (mailfrom) smtp.mailfrom=lists.denx.de\n\t(client-ip=81.169.180.215; helo=lists.denx.de;\n\tenvelope-from=u-boot-bounces@lists.denx.de;\n\treceiver=)","ozlabs.org;\n\tdkim=fail reason=\"signature verification failed\" (1024-bit key;\n\tunprotected) header.d=konsulko.com header.i=@konsulko.com\n\theader.b=\"sBvAl/KS\"; 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\n\tWed, 06 Sep 2017 23:52:39 -0700 (PDT)","Message-ID":"<1504767130.23573.14.camel@hp800z>","From":"Pantelis Antoniou ","To":"=?utf-8?q?=C5=81ukasz?= Majewski ","Date":"Thu, 07 Sep 2017 09:52:10 +0300","In-Reply-To":"<49fedf05-4896-3105-f143-d24db31f6182@denx.de>","References":"<1504555943-12893-1-git-send-email-pantelis.antoniou@konsulko.com>\n\t<1504555943-12893-9-git-send-email-pantelis.antoniou@konsulko.com>\n\t<49fedf05-4896-3105-f143-d24db31f6182@denx.de>","X-Mailer":"Evolution 3.10.4-0ubuntu2 ","Mime-Version":"1.0","Cc":"Marek Vasut , Tom Rini ,\n\tTero Kristo , u-boot@lists.denx.de,\n\tMaxime Ripard ,\n\tStefan Roese , Alan Ott ","Subject":"Re: [U-Boot] [PATCH v3 08/14] fit: fdt overlays doc","X-BeenThere":"u-boot@lists.denx.de","X-Mailman-Version":"2.1.18","Precedence":"list","List-Id":"U-Boot discussion ","List-Unsubscribe":",\n\t","List-Archive":"","List-Post":"","List-Help":"","List-Subscribe":",\n\t","Content-Type":"text/plain; charset=\"utf-8\"","Content-Transfer-Encoding":"base64","Errors-To":"u-boot-bounces@lists.denx.de","Sender":"\"U-Boot\" "}},{"id":1765724,"web_url":"http://patchwork.ozlabs.org/comment/1765724/","msgid":"","list_archive_url":null,"date":"2017-09-09T04:53:59","subject":"Re: [U-Boot] [PATCH v3 08/14] fit: fdt overlays doc","submitter":{"id":6170,"url":"http://patchwork.ozlabs.org/api/people/6170/","name":"Simon Glass","email":"sjg@chromium.org"},"content":"On 4 September 2017 at 14:12, Pantelis Antoniou\n wrote:\n> Signed-off-by: Pantelis Antoniou \n> ---\n> doc/uImage.FIT/command_syntax_extensions.txt | 12 +-\n> doc/uImage.FIT/overlay-fdt-boot.txt | 221 +++++++++++++++++++++++++++\n> doc/uImage.FIT/source_file_format.txt | 6 +-\n> 3 files changed, 236 insertions(+), 3 deletions(-)\n> create mode 100644 doc/uImage.FIT/overlay-fdt-boot.txt\n>\n\nAcked-by: Simon Glass ","headers":{"Return-Path":"","X-Original-To":"incoming@patchwork.ozlabs.org","Delivered-To":"patchwork-incoming@bilbo.ozlabs.org","Authentication-Results":["ozlabs.org;\n\tspf=none (mailfrom) smtp.mailfrom=lists.denx.de\n\t(client-ip=81.169.180.215; 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\n\tFri, 08 Sep 2017 21:54:19 -0700 (PDT)","MIME-Version":"1.0","In-Reply-To":"<1504555943-12893-9-git-send-email-pantelis.antoniou@konsulko.com>","References":"<1504555943-12893-1-git-send-email-pantelis.antoniou@konsulko.com>\n\t<1504555943-12893-9-git-send-email-pantelis.antoniou@konsulko.com>","From":"Simon Glass ","Date":"Fri, 8 Sep 2017 22:53:59 -0600","X-Google-Sender-Auth":"GL_Xym9uYmd3xTQWnwexERiG-Rg","Message-ID":"","To":"Pantelis Antoniou ","Cc":"Marek Vasut , Tom Rini ,\n\tTero Kristo ,\n\tU-Boot Mailing List , \n\tMaxime Ripard ,\n\tStefan Roese , Alan Ott ","Subject":"Re: [U-Boot] [PATCH v3 08/14] fit: fdt overlays doc","X-BeenThere":"u-boot@lists.denx.de","X-Mailman-Version":"2.1.18","Precedence":"list","List-Id":"U-Boot discussion ","List-Unsubscribe":",\n\t","List-Archive":"","List-Post":"","List-Help":"","List-Subscribe":",\n\t","Content-Type":"text/plain; charset=\"utf-8\"","Content-Transfer-Encoding":"base64","Errors-To":"u-boot-bounces@lists.denx.de","Sender":"\"U-Boot\" "}},{"id":1769388,"web_url":"http://patchwork.ozlabs.org/comment/1769388/","msgid":"","list_archive_url":null,"date":"2017-09-15T19:19:41","subject":"Re: [U-Boot] [PATCH v3 08/14] fit: fdt overlays doc","submitter":{"id":12501,"url":"http://patchwork.ozlabs.org/api/people/12501/","name":"Simon Glass","email":"sjg@google.com"},"content":"On 4 September 2017 at 14:12, Pantelis Antoniou\n wrote:\n> Signed-off-by: Pantelis Antoniou \n> ---\n> doc/uImage.FIT/command_syntax_extensions.txt | 12 +-\n> doc/uImage.FIT/overlay-fdt-boot.txt | 221 +++++++++++++++++++++++++++\n> doc/uImage.FIT/source_file_format.txt | 6 +-\n> 3 files changed, 236 insertions(+), 3 deletions(-)\n> create mode 100644 doc/uImage.FIT/overlay-fdt-boot.txt\n>\n\nAcked-by: Simon Glass \n\nApplied to u-boot-fdt thanks!","headers":{"Return-Path":"","X-Original-To":"incoming@patchwork.ozlabs.org","Delivered-To":"patchwork-incoming@bilbo.ozlabs.org","Authentication-Results":["ozlabs.org;\n\tspf=none (mailfrom) smtp.mailfrom=lists.denx.de\n\t(client-ip=81.169.180.215; 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