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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>

<p>The boot table consists of a linear array of 4-byte entries whose index

positions are defined by the <codeph>TBootTableEntry</codeph> enumeration

in <filepath>os/kernelhwsrv/kernel/eka/include/arm/bootdefs.h</filepath>. </p>

<p>The entries in the array are divided into two groups, one whose index positions

are defined by the enumerator names <codeph>BTF_*</codeph> and the other group

defined by the enumerator names <codeph>BTP_*</codeph>. </p>

<p>Entries in the first group specify addresses of <xref href="GUID-B3F6FC45-3BF0-5F92-8325-44C705BA47AE.dita">Boot

Table Functions</xref>. </p>

<p>Entries in the second group specify <xref href="GUID-C92CC81A-35A1-5860-AA08-C8C08B39804C.dita">Boot

Table MMU Permission and Cache Attribute Definitions</xref> to be used for

certain standard memory and I/O areas. </p>

<p>A boot table entry is the offset of the function from the beginning of

the bootstrap code but, since the bootstrap is linked for a base address of

zero and is position independent, bare function addresses can be used. </p>

<p>Use <codeph>DCD</codeph> to place a function in the boot table, for example: </p>

<codeblock id="GUID-F36DF0E5-E337-5B1B-B098-64D78C3B0339" xml:space="preserve">DCD function-name</codeblock>

<p>In the Template port, available in <filepath>os/kernelhwsrv/bsptemplate/asspandvariant/template_variant/bootstrap/template.s</filepath>,

the boot table is defined by the label <codeph>BootTable</codeph>, followed

by <codeph>DCD</codeph> entries for every boot table function, like in the

following example: </p>

<codeblock id="GUID-28F3F4E0-E196-50E4-8AFF-6672BA982FB4" xml:space="preserve">BootTable

        DCD    DoWriteC        ; output a debug character

        DCD    GetRamBanks    ; get list of RAM banks

        DCD    SetupRamBank    ; set up a RAM bank

        DCD    GetRomBanks    ; get list of ROM banks

        DCD    SetupRomBank    ; set up a ROM bank

        ...</codeblock>