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
  *CPU
  • VR5701 (NEC VR5500A SOC chip) (333MHz)
  *Memory
  • 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 192.168.1.1) 
    - T-Cube Ethernet to hub (I configured as 192.168.1.2) 
    - 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 192.168.1.2")
  - Set variable bootaddr (I used "set bootaddr 192.168.1.1")
  - 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")