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>MIPS/RM7000 PMC-Sierra Ocelot</TITLE
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><DIV
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><H1
CLASS="SECT1"
><A
NAME="OCELOT"
>MIPS/RM7000 PMC-Sierra Ocelot</A
></H1
><DIV
CLASS="SECT2"
><H2
CLASS="SECT2"
><A
NAME="AEN5731"
>Overview</A
></H2
><P
>RedBoot
uses the front facing serial port. The default serial port settings are 38400,8,N,1.
RedBoot also supports ethernet. Management of onboard flash is also supported.</P
><P
>The following RedBoot configurations are supported:
<DIV
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><P
></P
><A
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></A
><TABLE
BORDER="1"
FRAME="border"
RULES="all"
CLASS="CALSTABLE"
><COL><COL><COL><COL><THEAD
><TR
><TH
>Configuration</TH
><TH
>Mode</TH
><TH
>Description</TH
><TH
>File</TH
></TR
></THEAD
><TBODY
><TR
><TD
>ROM</TD
><TD
>[ROM]</TD
><TD
>RedBoot running from the board's flash boot
sector.</TD
><TD
>redboot_ROM.ecm</TD
></TR
><TR
><TD
>RAM</TD
><TD
>[RAM]</TD
><TD
>RedBoot running from RAM with RedBoot in the
flash boot sector.</TD
><TD
>redboot_RAM.ecm</TD
></TR
></TBODY
></TABLE
><P
></P
></DIV
></P
></DIV
><DIV
CLASS="SECT2"
><H2
CLASS="SECT2"
><A
NAME="AEN5760"
>Additional commands</A
></H2
><P
>The <B
CLASS="COMMAND"
>exec</B
> command which allows the
loading and execution of Linux kernels, is supported for this architecture
(see <A
HREF="executing-programs.html"
>the Section called <I
>Executing Programs from RedBoot</I
> in Chapter 2</A
>). The
<B
CLASS="COMMAND"
>exec</B
> parameters used for MIPS boards are:</P
><P
></P
><DIV
CLASS="VARIABLELIST"
><DL
><DT
>-b <TT
CLASS="REPLACEABLE"
><I
><addr></I
></TT
></DT
><DD
><P
>Location to store command line and environment passed to kernel</P
></DD
><DT
>-w <TT
CLASS="REPLACEABLE"
><I
><time></I
></TT
></DT
><DD
><P
>Wait time in seconds before starting kernel</P
></DD
><DT
>-c <TT
CLASS="REPLACEABLE"
><I
>"params"</I
></TT
></DT
><DD
><P
>Parameters passed to kernel</P
></DD
><DT
><TT
CLASS="REPLACEABLE"
><I
><addr></I
></TT
></DT
><DD
><P
>Kernel entry point, defaulting to the entry point of the last image
loaded</P
></DD
></DL
></DIV
><P
>Linux kernels on MIPS platforms expect the entry point to be called with arguments
in the registers equivalent to a C call with prototype:
<TABLE
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><TR
><TD
><PRE
CLASS="PROGRAMLISTING"
>void Linux(int argc, char **argv, char **envp);</PRE
></TD
></TR
></TABLE
></P
><P
>RedBoot will place the appropriate data at the offset specified by the
<CODE
CLASS="PARAMETER"
>-b</CODE
> parameter, or by default at address 0x80080000, and will set the
arguments accordingly when calling into the kernel.</P
><P
>The default entry point, if no image with explicit entry point has been loaded and
none is specified, is 0x80000750.</P
></DIV
><DIV
CLASS="SECT2"
><H2
CLASS="SECT2"
><A
NAME="AEN5792"
>Memory Maps</A
></H2
><P
>RedBoot sets up the following memory map on the Ocelot board. </P
><P
>Note that these addresses are accessed through kseg0/1 and thus translate
to the actual address range 0x80000000-0xbfffffff, depending on the need for
caching/non-caching access to the bus.<DIV
CLASS="NOTE"
><BLOCKQUOTE
CLASS="NOTE"
><P
><B
>NOTE: </B
>The virtual memory maps in this section use a C and B column to indicate
whether or not the region is cached (C) or buffered (B).</P
></BLOCKQUOTE
></DIV
><TABLE
BORDER="5"
BGCOLOR="#E0E0F0"
WIDTH="70%"
><TR
><TD
><PRE
CLASS="PROGRAMLISTING"
>Physical Address Range Description
----------------------- -----------
0x00000000 - 0x0fffffff SDRAM
0x10000000 - 0x10ffffff PCI I/O space
0x12000000 - 0x13ffffff PCI Memory space
0x14000000 - 0x1400ffff Galileo system controller
0x1c000000 - 0x1c0000ff PLD (board logic)
0x1fc00000 - 0x1fc7ffff flash</PRE
></TD
></TR
></TABLE
></P
></DIV
><DIV
CLASS="SECT2"
><H2
CLASS="SECT2"
><A
NAME="AEN5800"
>Rebuilding RedBoot</A
></H2
><P
>These shell variables provide the platform-specific information
needed for building RedBoot according to the procedure described in
<A
HREF="rebuilding-redboot.html"
>Chapter 3</A
>:
<TABLE
BORDER="5"
BGCOLOR="#E0E0F0"
WIDTH="70%"
><TR
><TD
><PRE
CLASS="PROGRAMLISTING"
>export TARGET=ocelot
export ARCH_DIR=mips
export PLATFORM_DIR=rm7000/ocelot</PRE
></TD
></TR
></TABLE
></P
><P
>The names of configuration files are listed above with the
description of the associated modes.</P
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