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Adaptation/GUID-9595FD6F-1EDE-51A8-B00D-029CFDFE0F38.dita
author Graeme Price <GRAEME.PRICE@NOKIA.COM>
Fri, 15 Oct 2010 14:32:18 +0100
changeset 15 307f4279f433
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<?xml version="1.0" encoding="utf-8"?>
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<!-- Copyright (c) 2007-2010 Nokia Corporation and/or its subsidiary(-ies) All rights reserved. -->
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<!-- This component and the accompanying materials are made available under the terms of the License
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"Eclipse Public License v1.0" which accompanies this distribution,
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and is available at the URL "http://www.eclipse.org/legal/epl-v10.html". -->
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<!-- Initial Contributors:
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    Nokia Corporation - initial contribution.
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Contributors:
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-->
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<!DOCTYPE concept
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  PUBLIC "-//OASIS//DTD DITA Concept//EN" "concept.dtd">
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<concept id="GUID-9595FD6F-1EDE-51A8-B00D-029CFDFE0F38" xml:lang="en"><title>Boot Table</title><shortdesc>Describes the boot table.</shortdesc><prolog><metadata><keywords/></metadata></prolog><conbody>
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<p>The boot table consists of a linear array of 4-byte entries whose index
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positions are defined by the <codeph>TBootTableEntry</codeph> enumeration
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in <filepath>os/kernelhwsrv/kernel/eka/include/arm/bootdefs.h</filepath>. </p>
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<p>The entries in the array are divided into two groups, one whose index positions
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are defined by the enumerator names <codeph>BTF_*</codeph> and the other group
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defined by the enumerator names <codeph>BTP_*</codeph>. </p>
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<p>Entries in the first group specify addresses of <xref href="GUID-B3F6FC45-3BF0-5F92-8325-44C705BA47AE.dita">Boot
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Table Functions</xref>. </p>
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<p>Entries in the second group specify <xref href="GUID-C92CC81A-35A1-5860-AA08-C8C08B39804C.dita">Boot
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Table MMU Permission and Cache Attribute Definitions</xref> to be used for
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certain standard memory and I/O areas. </p>
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<p>A boot table entry is the offset of the function from the beginning of
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the bootstrap code but, since the bootstrap is linked for a base address of
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zero and is position independent, bare function addresses can be used. </p>
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<p>Use <codeph>DCD</codeph> to place a function in the boot table, for example: </p>
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<codeblock id="GUID-F36DF0E5-E337-5B1B-B098-64D78C3B0339" xml:space="preserve">DCD function-name</codeblock>
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<p>In the Template port, available in <filepath>os/kernelhwsrv/bsptemplate/asspandvariant/template_variant/bootstrap/template.s</filepath>,
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the boot table is defined by the label <codeph>BootTable</codeph>, followed
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by <codeph>DCD</codeph> entries for every boot table function, like in the
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following example: </p>
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<codeblock id="GUID-28F3F4E0-E196-50E4-8AFF-6672BA982FB4" xml:space="preserve">BootTable
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        DCD    DoWriteC        ; output a debug character
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        DCD    GetRamBanks    ; get list of RAM banks
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        DCD    SetupRamBank    ; set up a RAM bank
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        DCD    GetRomBanks    ; get list of ROM banks
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        DCD    SetupRomBank    ; set up a ROM bank
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        ...</codeblock>
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</conbody></concept>
FCL/sftools/depl/docscontent