TCube Info

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This page describes how to load Linux on the T-Cube board.

Table Of Contents:

Hardware Used

*Board Order Number:     SEMC5701(T-Cube)/SHIMAFUJI
          • VR5701 (NEC VR5500A SOC chip) (333MHz)
          • 64 Mbyte SDRAM
          • 16 Mbyte Flash
  *Graphics controller
          • SMI (SM722GX )
  *Other Feature
          • Timer x 4 ( VR5701 )
          • UART x2 ( VR5701 /16550 compatible)
          • PCI ( VR5701 ) -- no PCI connector/header on the baord
          • Sound AC97 ( VR5701 )
          • IDE/Compact Flash ( VR5701 )
          • RTC (RV 5C348B)
          • Ethernet ( Intel GD82559ERSL3DG )
          • USB(USB2) ( NEC uPD720101 )
          • CF

Software and Configuration Files Used

  • PMON
    • setup
    • boot
  • Toolchain
    • Mips Toolchain from Lineo
  • kernel
    • celinux-040503.tar.bz2
  • root filesystem
    • [unprepared]

General Outline for Bootstrapping using PMON

Preparing Target Hardware and Connections

    • Connections:
      • Host machine Ethernet to hub (I configured as
      • T-Cube Ethernet to hub (I configured as
      • Connect serial cable between T-Cube and host machine
        • Serial1 connector to interface module serial port
        • Other end of null-modem cable to first serial port (ttyS0) on the Linux host machine

Preparing Host Software

    • Download and place files in /tftpboot
    • Make sure tftpd is ready to run
    • Confirm minicom is configured to access /dev/ttyS0, at 115K N81

Using PMON to Boot the Kernel

    • Root filesystem is NFS

Building the Kernel

Here are some commands I used to build the kernel:

  • cd celinux-040503/
  • export PATH=/usr/local/bin:$PATH
  • cp arch/mips/defconfig-tcube .config
  • make ARCH=mips CROSS_COMPILE=mipsel-linux- menuconfig
    • disable XIP
  • make ARCH=mips CROSS_COMPILE=mipsel-linux- dep
  • make ARCH=mips CROSS_COMPILE=mipsel-linux-

Preparing the Kernel to Download

  • cp vmlinux /tftpboot/

Starting the NFS daemon

  • /etc/rc.d/init.d/nfs start

Setting Environment Variable and Write Environment Value on T-Cube

  • minicom (set to /dev/ttyS0)
  • Set environment variable
    • Set variable tty0 (I used "set tty0 115200")
    • Set variable netaddr (I used "set netaddr")
    • Set variable bootaddr (I used "set bootaddr")
    • Set variable bootfile (I used "set bootfile vmlinux")
  • Write environment value
    • Employed "write_env" command

Downloading the Kernel to T-Cube

  • minicom (set to /dev/ttyS0)
  • Download the kernel
    • Employ "boot" command
    • As "boot" command completes, "Entry-address" appears.

Booting the Kernel

  • Employ "go" command (I used "g -e Entry-address")