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>MIPS/MIPS32(CoreLV 4Kc)+MIPS64(CoreLV 5Kc) Malta Board </TITLE
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><DIV
CLASS="SECT1"
><H1
CLASS="SECT1"
><A
NAME="MALTA">MIPS/MIPS32(CoreLV 4Kc)+MIPS64(CoreLV 5Kc) Malta Board</H1
><DIV
CLASS="SECT2"
><H2
CLASS="SECT2"
><A
NAME="AEN6809">Overview</H2
><P
>RedBoot supports both front
facing serial ports and the built in ethernet port for communication and downloads.
The default serial port settings are 38400,8,N,1. RedBoot runs from and supports
flash management for the system flash region.</P
><P
>The following RedBoot configurations are supported:
<DIV
CLASS="INFORMALTABLE"
><A
NAME="AEN6819"><P
></P
><TABLE
BORDER="1"
CLASS="CALSTABLE"
><THEAD
><TR
><TH
ALIGN="LEFT"
VALIGN="TOP"
>Configuration</TH
><TH
ALIGN="LEFT"
VALIGN="TOP"
>Mode</TH
><TH
ALIGN="LEFT"
VALIGN="TOP"
>Description</TH
><TH
ALIGN="LEFT"
VALIGN="TOP"
>File</TH
></TR
></THEAD
><TBODY
><TR
><TD
ALIGN="LEFT"
VALIGN="TOP"
>ROM</TD
><TD
ALIGN="LEFT"
VALIGN="TOP"
>[ROM]</TD
><TD
ALIGN="LEFT"
VALIGN="TOP"
>RedBoot running from the board's flash boot
sector.</TD
><TD
ALIGN="LEFT"
VALIGN="TOP"
>redboot_ROM.ecm</TD
></TR
><TR
><TD
ALIGN="LEFT"
VALIGN="TOP"
>RAM</TD
><TD
ALIGN="LEFT"
VALIGN="TOP"
>[RAM]</TD
><TD
ALIGN="LEFT"
VALIGN="TOP"
>RedBoot running from RAM with RedBoot in the
flash boot sector.</TD
><TD
ALIGN="LEFT"
VALIGN="TOP"
>redboot_RAM.ecm</TD
></TR
></TBODY
></TABLE
><P
></P
></DIV
></P
></DIV
><DIV
CLASS="SECT2"
><H2
CLASS="SECT2"
><A
NAME="AEN6838">Initial Installation</H2
><P
>RedBoot is installed using the code download facility built into the
Malta board. See the Malta User manual for details, and also the Malta download
format in <A
HREF="malta.html#MALTA-DOWNLOAD-FORMAT"
>the Section called <I
>Malta download format</I
></A
>.</P
><DIV
CLASS="SECT3"
><H3
CLASS="SECT3"
><A
NAME="AEN6842">Quick download instructions</H3
><P
>Here are quick start instructions for downloading the prebuilt RedBoot
image. </P
><P
></P
><OL
TYPE="1"
><LI
><P
>Locate the prebuilt files in the bin directory: <TT
CLASS="FILENAME"
>deleteall.fl</TT
> and <TT
CLASS="FILENAME"
>redboot_ROM.fl</TT
>. </P
></LI
><LI
><P
>Make sure switch S5-1 is ON. Reset the board and verify that
the LED display reads <TT
CLASS="COMPUTEROUTPUT"
>Flash DL</TT
>. </P
></LI
><LI
><P
>Make sure your parallel port is connected to the 1284 port
Of the Atlas board. </P
></LI
><LI
><P
>Send the <TT
CLASS="FILENAME"
>deleteall.fl</TT
> file to the
parallel port to erase previous images:
<TABLE
BORDER="5"
BGCOLOR="#E0E0F0"
WIDTH="70%"
><TR
><TD
><PRE
CLASS="SCREEN"
>$ <TT
CLASS="USERINPUT"
><B
>cat deleteall.fl >/dev/lp0</B
></TT
></PRE
></TD
></TR
></TABLE
>
When this is complete, the LED display should read
<TT
CLASS="COMPUTEROUTPUT"
>Deleted</TT
>.</P
></LI
><LI
><P
>Send the RedBoot image to the board:
<TABLE
BORDER="5"
BGCOLOR="#E0E0F0"
WIDTH="70%"
><TR
><TD
><PRE
CLASS="SCREEN"
>$ <TT
CLASS="USERINPUT"
><B
>cat redboot_ROM.fl >/dev/lp0</B
></TT
></PRE
></TD
></TR
></TABLE
>
When this is complete, the LED display should show the last address
programmed. This will be something like:
<TT
CLASS="COMPUTEROUTPUT"
>1fc17000</TT
>. </P
></LI
><LI
><P
>Change switch S5-1 to OFF and reset the board. The LED display
should read <TT
CLASS="COMPUTEROUTPUT"
>RedBoot</TT
>. </P
></LI
><LI
><P
>Run the RedBoot <B
CLASS="COMMAND"
>fis init</B
> and <B
CLASS="COMMAND"
>fconfig</B
> commands to initialize the flash. See <A
HREF="flash-image-system.html"
>the Section called <I
>Flash Image System (FIS)</I
> in Chapter 2</A
>
and <A
HREF="persistent-state-flash.html"
>the Section called <I
>Persistent State Flash-based Configuration and Control</I
> in Chapter 2</A
> for details. </P
></LI
></OL
></DIV
><DIV
CLASS="SECT3"
><H3
CLASS="SECT3"
><A
NAME="MALTA-DOWNLOAD-FORMAT">Malta download format</H3
><P
>In order to download RedBoot to the Malta board, it must be converted
to the Malta download format.</P
><P
>The <I
CLASS="CITETITLE"
>Atlas/Malta Developer's Kit</I
> CD contains an <SPAN
CLASS="APPLICATION"
>srecconv.pl</SPAN
> utility which requires Perl. This utility is part
of the <TT
CLASS="FILENAME"
>yamon/yamon-src-02.00.tar.gz</TT
> tarball
on the Dev Kit CD. The path in the expanded tarball is <TT
CLASS="FILENAME"
>yamon/bin/tools</TT
>. To use
<SPAN
CLASS="APPLICATION"
>srecconv</SPAN
> to convert the S-record file:
<TABLE
BORDER="5"
BGCOLOR="#E0E0F0"
WIDTH="70%"
><TR
><TD
><PRE
CLASS="SCREEN"
>$ <TT
CLASS="USERINPUT"
><B
>cp redboot_ROM.srec redboot_ROM.rec</B
></TT
>
$ <TT
CLASS="USERINPUT"
><B
>srecconv.pl -ES L -A 29 redboot_ROM</B
></TT
></PRE
></TD
></TR
></TABLE
>
The resulting file is named <TT
CLASS="FILENAME"
>redboot_ROM.fl</TT
>.</P
></DIV
></DIV
><DIV
CLASS="SECT2"
><H2
CLASS="SECT2"
><A
NAME="AEN6888">Additional commands</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
BORDER="5"
BGCOLOR="#E0E0F0"
WIDTH="70%"
><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
<TT
CLASS="PARAMETER"
><I
>-b</I
></TT
> 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="AEN6920">Interrupts</H2
><P
>RedBoot uses an interrupt vector table which is located at address 0x80000200.
Entries in this table are pointers to functions with this protoype: <TABLE
BORDER="5"
BGCOLOR="#E0E0F0"
WIDTH="70%"
><TR
><TD
><PRE
CLASS="PROGRAMLISTING"
>int irq_handler( unsigned vector, unsigned data )</PRE
></TD
></TR
></TABLE
>On the malta
board, the vector argument is one of 22 interrupts defined in <TT
CLASS="COMPUTEROUTPUT"
>hal/mips/malta/<TT
CLASS="REPLACEABLE"
><I
>VERSION</I
></TT
>/include/plf_intr.h</TT
>: <TABLE
BORDER="5"
BGCOLOR="#E0E0F0"
WIDTH="70%"
><TR
><TD
><PRE
CLASS="PROGRAMLISTING"
> #define CYGNUM_HAL_INTERRUPT_SOUTH_BRIDGE_INTR 0
#define CYGNUM_HAL_INTERRUPT_SOUTH_BRIDGE_SMI 1
#define CYGNUM_HAL_INTERRUPT_CBUS_UART 2
#define CYGNUM_HAL_INTERRUPT_COREHI 3
#define CYGNUM_HAL_INTERRUPT_CORELO 4
#define CYGNUM_HAL_INTERRUPT_COMPARE 5
#define CYGNUM_HAL_INTERRUPT_TIMER 6
#define CYGNUM_HAL_INTERRUPT_KEYBOARD 7
#define CYGNUM_HAL_INTERRUPT_CASCADE 8
#define CYGNUM_HAL_INTERRUPT_TTY1 9
#define CYGNUM_HAL_INTERRUPT_TTY0 10
#define CYGNUM_HAL_INTERRUPT_11 11
#define CYGNUM_HAL_INTERRUPT_FLOPPY 12
#define CYGNUM_HAL_INTERRUPT_PARALLEL 13
#define CYGNUM_HAL_INTERRUPT_REAL_TIME_CLOCK 14
#define CYGNUM_HAL_INTERRUPT_I2C 15
#define CYGNUM_HAL_INTERRUPT_PCI_AB 16
#define CYGNUM_HAL_INTERRUPT_PCI_CD 17
#define CYGNUM_HAL_INTERRUPT_MOUSE 18
#define CYGNUM_HAL_INTERRUPT_19 19
#define CYGNUM_HAL_INTERRUPT_IDE_PRIMARY 20
#define CYGNUM_HAL_INTERRUPT_IDE_SECONDARY 21</PRE
></TD
></TR
></TABLE
>The data
passed to the ISR is pulled from a data table (<TT
CLASS="COMPUTEROUTPUT"
>hal_interrupt_data</TT
>) which immediately follows the interrupt vector table. With
22 interrupts, the data table starts at address 0x80000258.</P
><P
>An application may create a normal C function with the above prototype
to be an ISR. Just poke its address into the table at the correct index and
enable the interrupt at its source. The return value of the ISR is ignored
by RedBoot. </P
></DIV
><DIV
CLASS="SECT2"
><H2
CLASS="SECT2"
><A
NAME="AEN6929">Memory Maps</H2
><P
>Memory Maps RedBoot sets up the following memory map on the Malta board.<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 C B Description
----------------------- - - -----------
0x80000000 - 0x81ffffff Y Y SDRAM
0x9e000000 - 0x9e3fffff Y N System flash (cached)
0x9fc00000 - 0x9fffffff Y N System flash (mirrored)
0xa8000000 - 0xb7ffffff N N PCI Memory Space
0xb4000000 - 0xb40fffff N N Galileo System Controller
0xb8000000 - 0xb80fffff N N Southbridge / ISA
0xb8100000 - 0xbbdfffff N N PCI I/O Space
0xbe000000 - 0xbe3fffff N N System flash (noncached)
0xbf000000 - 0xbfffffff N N Board logic FPGA</PRE
></TD
></TR
></TABLE
></P
></DIV
><DIV
CLASS="SECT2"
><H2
CLASS="SECT2"
><A
NAME="AEN6936">Rebuilding RedBoot</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=malta_mips32_4kc
export ARCH_DIR=mips
export PLATFORM_DIR=malta</PRE
></TD
></TR
></TABLE
></P
><P
>The names of configuration files are listed above with the
description of the associated modes.</P
></DIV
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