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>MIPS/VR4375 NEC DDB-VRC4375</TITLE
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><H1
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><A
NAME="VRC4375">MIPS/VR4375 NEC DDB-VRC4375</H1
><DIV
CLASS="SECT2"
><H2
CLASS="SECT2"
><A
NAME="AEN7021">Overview</H2
><P
>RedBoot supports only serial port 1, which is connected to the upper
of the stacked serial connectors on the board. The default serial
port settings are 38400,8,N,1. FLASH management is also supported.</P
><P
>The following RedBoot configurations are supported:
<DIV
CLASS="INFORMALTABLE"
><A
NAME="AEN7031"><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"
>ROMRAM</TD
><TD
ALIGN="LEFT"
VALIGN="TOP"
>[ROMRAM]</TD
><TD
ALIGN="LEFT"
VALIGN="TOP"
>RedBoot running from RAM, but contained in the
board's flash boot sector.</TD
><TD
ALIGN="LEFT"
VALIGN="TOP"
>redboot_ROMRAM.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="AEN7050">Initial Installation Method</H2
><P
>A device programmer should be used to program a socketed FLASH part
(AMD 29F040). The board as delivered is configured for a 512K
EPROM. To install a FLASH ROM, Jumpers J30, J31 and J36 need to be
changed as described in the board's User Manual.</P
></DIV
><DIV
CLASS="SECT2"
><H2
CLASS="SECT2"
><A
NAME="AEN7053">Special RedBoot Commands</H2
><P
>None.</P
></DIV
><DIV
CLASS="SECT2"
><H2
CLASS="SECT2"
><A
NAME="AEN7056">Memory Maps</H2
><P
>RedBoot sets up the memory map primarily as described in the board's
User Manual. There are some minor differences, noted in the following
table:
<TABLE
BORDER="5"
BGCOLOR="#E0E0F0"
WIDTH="70%"
><TR
><TD
><PRE
CLASS="SCREEN"
>Physical Virtual Resource
Addresses Addresses
00000000-01FFFFFF 80000000-81FFFFFF Base SDRAM (cached)
00000000-01FFFFFF A0000000-A1FFFFFF Base SDRAM (uncached)
0C000000-0C0BFFFF AC000000-AC0B0000 PCI IO space
0F000000-0F0001FF AF000000-AF0001FF VRC4375 Registers
1C000000-1C0FFFFF BC000000-BC0FFFFF VRC4372 Registers
1C100000-1DFFFFFF BC100000-BDFFFFFF PCI Memory space
1FC00000-1FC7FFFF BFC00000-BFC7FFFF FLASH ROM
80000000-8000000D C0000000-C000000D RTC
8000000E-80007FFF C000000E-C0007FFF NVRAM
81000000-81FFFFFF C1000000-C1FFFFFF Z85C30 DUART
82000000-82FFFFFF C2000000-C2FFFFFF Z8536 Timer
83000000-83FFFFFF C3000000-C3FFFFFF 8255 Parallel port
87000000-87FFFFFF C7000000-C7FFFFFF Seven segment display</PRE
></TD
></TR
></TABLE
></P
><DIV
CLASS="NOTE"
><BLOCKQUOTE
CLASS="NOTE"
><P
><B
>NOTE: </B
>By default the VRC4375 SIMM control registers are not programmed
since the values used must depend on the SIMMs installed. If SIMMs
are to be used, correct values must be placed in these registers
before accessing the SIMM address range.</P
></BLOCKQUOTE
></DIV
><DIV
CLASS="NOTE"
><BLOCKQUOTE
CLASS="NOTE"
><P
><B
>NOTE: </B
>The allocation of address ranges to devices in the PCI IO and
memory spaces is handled by the eCos PCI support library. They do
not correspond to those described in the board User Manual.</P
></BLOCKQUOTE
></DIV
><DIV
CLASS="NOTE"
><BLOCKQUOTE
CLASS="NOTE"
><P
><B
>NOTE: </B
>The MMU has been set up to relocate the VRC4372 supported devices
mapped at physical addresses 0x8xxxxxxx to virtual addresses
0xCxxxxxxx.</P
></BLOCKQUOTE
></DIV
></DIV
><DIV
CLASS="SECT2"
><H2
CLASS="SECT2"
><A
NAME="AEN7069">Ethernet Driver</H2
><P
>The ethernet driver is in two parts:</P
><P
>A generic ether driver for the Intel i21143 device is located in
<TT
CLASS="FILENAME"
>devs/eth/intel/i21143</TT
>. Its package name is <TT
CLASS="COMPUTEROUTPUT"
>CYGPKG_DEVS_ETH_INTEL_I21143</TT
>.</P
><P
>The platform-specific ether driver is <TT
CLASS="FILENAME"
>devs/eth/mips/vrc4375</TT
>. Its package is
<TT
CLASS="COMPUTEROUTPUT"
>CYGPKG_DEVS_ETH_MIPS_VRC4375</TT
>. This
tells the generic driver the address in IO memory of the chip, for
example, and other configuration details. The ESA (MAC address) is by
default collected from on-board serial EEPROM, unless configured
statically within this package.</P
></DIV
><DIV
CLASS="SECT2"
><H2
CLASS="SECT2"
><A
NAME="AEN7078">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=vrc4373
export ARCH_DIR=mips
export PLATFORM_DIR=vrc4373</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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