Docs: Changes to source.android.com

  - 192190878 Update build numbers for Apr 2018 backpocket releases by Android Partner Docs <noreply@android.com>
  - 192180981 Fix hidl-cpp Nfc example to compile. by Android Partner Docs <noreply@android.com>
  - 192149941 Fix link to user guide, add link to dir, add section header by Clay Murphy <claym@google.com>
  - 192144867 Fix lines exceeding 80 character limit by Android Partner Docs <noreply@android.com>
  - 192143959 Devsite localized content from translation request f1daaa... by Android Partner Docs <noreply@android.com>
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  - 192139612 Fix link to moved external HiKey960_Schematics.pdf by Clay Murphy <claym@google.com>
  - 191951035 Remove ccache advice we don't believe. by Android Partner Docs <noreply@android.com>
  - 191909962 Typo in closing tag. <ol> to </ol> by Android Partner Docs <noreply@android.com>
  - 191907769 Update hikey960 to use vendor partition by Android Partner Docs <noreply@android.com>
  - 191821197 Amending additional steps and requirements on /vendor/etc... by Android Partner Docs <noreply@android.com>
  - 191808945 Add code tags by Android Partner Docs <noreply@android.com>
  - 191783990 Update typing for plural permissions following b/77605085 by Christina Nguyen <cqn@google.com>
  - 191744609 Change headings from title case to sentence case in /setup. by Android Partner Docs <noreply@android.com>
  - 191666381 Update File DAC configuration on using an OEM-specific AID by Christina Nguyen <cqn@google.com>
  - 191644853 Update AOSP links in April bulletins by Danielle Roberts <daroberts@google.com>
  - 191606759 Devsite localized content from translation request ab2ae5... by Android Partner Docs <noreply@android.com>
  - 191604399 Remove duplicate entry (already in Android bulletin) by Android Partner Docs <noreply@android.com>
  - 191463374 Devsite localized content from translation request 177e53... by Android Partner Docs <noreply@android.com>
  - 191451679 Add more information on boottime optimization by Android Partner Docs <noreply@android.com>
  - 191440990 Devsite localized content from translation request 1028aa... by Android Partner Docs <noreply@android.com>
  - 191438500 Update OWNERS files with new team members by Danielle Roberts <daroberts@google.com>
  - 191438471 Fix incorrect CVE number by Android Partner Docs <noreply@android.com>
  - 191365978 Update build numbers for Apr 2018 releases by Android Partner Docs <noreply@android.com>
  - 191337429 No need to download Mali binary blob anymore by Android Partner Docs <noreply@android.com>
  - 191317352 Fixed mixup in ARF name (Access File Rule -> Access Rule ... by Christina Nguyen <cqn@google.com>
  - 191315249 Fix dates by Clay Murphy <claym@google.com>
  - 191313037 Add second details ref, remove spacing other artifacts by Clay Murphy <claym@google.com>
  - 191308126 Add April 2018 security bulletins and acknowledgements by Clay Murphy <claym@google.com>
  - 191302158 Update February Pixel bulletin to move CVE-2017-15817 as ... by Android Partner Docs <noreply@android.com>
  - 191302132 Update February Android bulletin to move CVE-2017-15817 a... by Android Partner Docs <noreply@android.com>
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  - 191132422 Adding new vts Test Framework with three new pages and mu... by Heidi von Markham <hvm@google.com>
  - 191132198 Clarify that the OTA updates are "system" updates on the ... by Christina Nguyen <cqn@google.com>
  - 191083408 FooCallback should be extending IFooCallback.Stub, not IF... by Android Partner Docs <noreply@android.com>
  - 190951580 Remove message soliciting external contributions by Clay Murphy <claym@google.com>
  - 190817491 Updating using multiple dt overlays by Heidi von Markham <hvm@google.com>
  - 190786806 hikey: Switch to compressed kernel images by Android Partner Docs <noreply@android.com>
  - 190699917 Add YIR2017 to updates and resources page by Danielle Roberts <daroberts@google.com>
  - 190684574 Reorg of Setup to include directories, fixing old/bad/non... by Heidi von Markham <hvm@google.com>
  - 190661679 Added missing change log to CDD 5.1. by Android Partner Docs <noreply@android.com>
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  - 190643444 Adding details on structured interfaces by Heidi von Markham <hvm@google.com>

PiperOrigin-RevId: 192190878
Change-Id: If9d3a38dd1075636c0a61651cbd73e8acc903146

1 files changed, 10 insertions, 4 deletions

diff --git a/en/devices/architecture/dto/multiple.html b/en/devices/architecture/dto/multiple.html
index 52f47a46..f431a9d7 100644
--- a/en/devices/architecture/dto/multiple.html
+++ b/en/devices/architecture/dto/multiple.html
@@ -43,12 +43,18 @@ DTs.</figcaption>
 <p>The bootloader should be able to:</p>
 
 <ul>
-<li>read the SoC ID and select the main DT correspondingly, and</li>
-<li>read the board ID and select the overlay DT accordingly.</li>
+<li>Read the SoC ID and select the corresponding main device tree, and</li>
+<li>Read the board ID and select the set of overlay device trees accordingly.
+</li>
 </ul>
 
-<p>Only one main DT and one overlay DT are selected for use at runtime, and the
-selected pair must be compatible.</p>
+<p>Only one main DT should be selected for use at runtime. Multiple overlay DTs
+may be selected but they must be compatible with the chosen main DT. Using
+multiple overlays can help avoid storing one overlay per board within the DTBO
+partition and enable the bootloader to determine the subset of required overlays
+based on the board ID (or possibly by probing the peripherals). For
+example, Board A may need the devices added by the overlays 1, 3, and 5 while
+Board B may need the devices added by the overlays 1, 4, and 5.</p>
 
 <h2 id=partition>Partitioning</h2>
 <p>To partition, determine a bootloader runtime-accessible and trusted location