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136 lines
5.3 KiB
Text
136 lines
5.3 KiB
Text
Copyright (c) 2012, The Linux Foundation. All rights reserved.
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Redistribution and use in source form and compiled forms (SGML, HTML,
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PDF, PostScript, RTF and so forth) with or without modification, are
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permitted provided that the following conditions are met:
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Redistributions in source form must retain the above copyright
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notice, this list of conditions and the following disclaimer as the
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first lines of this file unmodified.
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Redistributions in compiled form (transformed to other DTDs,
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converted to PDF, PostScript, RTF and other formats) must reproduce
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the above copyright notice, this list of conditions and the following
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disclaimer in the documentation and/or other materials provided with
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the distribution.
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THIS DOCUMENTATION IS PROVIDED "AS IS" AND ANY EXPRESS OR IMPLIED
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WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE AND
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NON-INFRINGEMENT ARE DISCLAIMED. IN NO EVENT SHALL THE FREEBSD
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DOCUMENTATION PROJECT BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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OF THIS DOCUMENTATION, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
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DAMAGE.
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June 2014, Ketut Putu Kumajaya
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Samsung Exynos DTBH device tree documentation.
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Android - Table of Device Tree
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==============================
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0) Document revision
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v1.0 - Initial version (dng)
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1) Android boot image:
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----------------------
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1.1) Header:
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1) Magic (8B)
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2) kernel size (4B)
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3) kernel addr (4B)
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4) ramdisk size (4B)
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5) ramdisk addr (4B)
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6) 2ndary size (4B)
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7) 2ndary addr (4B)
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8) tags addr (4B)
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9) page size (4B)
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10) unused #1 (4B) (zero in standard Android)
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11) unused #2 (4B) (zero in standard Android)
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12) product name (16B)
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13) kernel cmdline (512B)
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14) id (8B)
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1.2) Layout:
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A) header (as above - 1 page)
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B) kernel (n pages)
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C) ramdisk (m pages)
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D) second stage (o pages)
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2) Exynos DTBH table of device tree
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--------------------------
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2.1) Changes:
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i) use "unused #1, #2" members in existing boot image
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header to point to new table of device tree
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(#1 - size of Exynos DTBH table of DT)
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ii) append table of device tree (described later)
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after "D) second stage"
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2.2) Format:
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size
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x +------------------+
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| | MAGIC ("DTBH") | 4B
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| +------------------+
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header | VERSION | uint32 (version 2, 0x00000002)
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| +------------------+
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| | num of DTBs | uint32 (number of DTB entries, e.g. 5 entries, 0x00000005)
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x +------------------+
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| | chip #1 | uint32 (e.g. ID for 5422, 0x0000152e)
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| +------------------+
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| | platform #1 | uint32 (e.g. ID for k3g, 0x00001e92)
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| +------------------+
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device | subtype #1 | uint32 (e.g. ID for k3g_eur_open, 0x7d64f612)
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#1 +------------------+
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entry | hw_rev #1 | uint32 (e.g. k3g rev 2, 0x00000002)
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| +------------------+
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| | hw_rev_end #1 | uint32 (e.g. k3g rev_end 2, 0x00000002)
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| +------------------+
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| | offset #1 | uint32 (byte offset from start/before MAGIC
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| +------------------+ to DTB entry, e.g. 0x00000800)
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| | size #1 | uint32 (size in bytes of DTB blob
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| +------------------+ e.g. 110,592 bytes, 0x0001b000)
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| | space #1 | uint32 (0x00000020)
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x +------------------+
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. .
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. . (repeat)
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. .
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x +------------------+
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| | chip #Z | uint32 (e.g. ID for 5422, 0x0000152e)
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| +------------------+
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| | platform #Z | uint32 (e.g. ID for k3g, 0x00001e92)
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| +------------------+
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device | subtype #Z | uint32 (e.g. ID for k3g_eur_open, 0x7d64f612)
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#1 +------------------+
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entry | hw_rev #Z | uint32 (e.g. k3g rev 10, 0x0000000A)
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| +------------------+
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| | hw_rev_end #Z | uint32 (e.g. k3g rev_end 255, 0x000000FF)
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| +------------------+
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| | offset #Z | uint32 (byte offset from start/before MAGIC
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| +------------------+ to DTB entry, e.g. 0x0006c800)
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| | size #Z | uint32 (size in bytes of DTB blob
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| +------------------+ e.g. 110,592 bytes, 0x0001b000)
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| | space #Z | uint32 (0x00000020)
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x +------------------+
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| padding | variable length for next DTB to start on
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+------------------+ page boundary
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| DTB #1 | variable (start is page aligned)
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| |
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+------------------+
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| padding | variable length for next DTB to start on
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+------------------+ page boundary
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.
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.
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.
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+------------------+
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| DTB #Z (last) | variable (start is page aligned)
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+------------------+
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