Difference between revisions of "User:SamuelM"

Latest revision as of 22:54, 7 March 2012

<< Member list

<< User list

whoami

• Name:

Samuel MARTIN

• Background:

Student at ESEO (French engineering school), specialised in Embedded systeme and Automation /

Master student at l'University of Plymouth (UK), in Robotics.

Embedded and System Engineer (Paris, France)

Interests

• Robotics
• Computer Vision
• Image & signal processing
• Linux

Objectives

or, what I wanna do with the APF board (APF27 + Devfull)

• Have fun!
• Improve my skills in:
  • Hardware development (FPGA)
  • System and embedded OS
  • Electronic development
  • Software development for embedded (tiny) target
• Share my experiments

Contributions

CMake

CMake infrastructure has been integrated in Buildroot since the BR release 2011.02 (available in Armadeus SDK since the armadeus-4.1 release).

Armadeus-4.0 uses the Buildroot 2010.11 release

Armadeus-4.1 uses the Buildroot 2011.05 release

Cross-compile OpenCV for your APF

Already in Buildroot since the BR release 2011.11 (requires CMake infrastructure).

External_Toolchains

How to build an Armadeus rootfs with a Buildroot more recent than the one used by the official Armadeus SDK. !!! Experimental !!!

Tips

A colored (and useful) prompt

zsh and ctafconf users won't be lost ;-)

##
## ~/.profile
##
source /etc/profile

## Enhanced promt
if [ -t 0 ]; then
    bldblk='\033[1;30m' # Black - Bold
    bldred='\033[1;31m' # Red
    bldgrn='\033[1;32m' # Green
    bldylw='\033[1;33m' # Yellow
    bldblu='\033[1;34m' # Blue
    bldpur='\033[1;35m' # Purple
    bldcyn='\033[1;36m' # Cyan
    bldwht='\033[1;37m' # White
    txtrst='\033[0m'    # Text Reset
    undred='\033[4;31m' # Red - Underlined
    bgdred='\033[1;41m' # Red - Background
    bgdblu='\033[1;44m' # Blue - Background
fi;

rootbgd="${bgdred}"
userbgd="${bgdblu}"

export PS1="\$([ \$(id -u) -eq 0 ] && echo -en \"${rootbgd}\" || echo -en \"${userbgd}\")\u${bldylw}@${bldgrn}\h${txtrst} \
${bldpur}[\$(eval \"res=\$?\"; [ \${res} -eq 0 ] && echo -en \"${bldwht}\${res}\" || echo -en \"${bldred}err \${res}\")${bldpur}] \
[${bldblu}\$([ \$(id -u) -eq 0 ] && echo -en \"\\W\" || echo -en \"\\\w\")${bldpur}] ${txtrst}\n\${SHELL:5}${bldgrn}\$${txtrst} "

u-boot configuration

1. nfs-boot (kernel and rootfs), if the nfs server is alive
2. boot from the NAND flash, otherwise

u-boot environment

BIOS> setenv nfsboot 'setenv bootargs ${console} ${mtdparts}; \
 run addnfsargs addipargs; \
 setenv autostart yes; \
 nfs ${loadaddr} {serverip}:${rootpath}/${board_name}-linux.bin; \
 bootm'
BIOS> setenv addnfsargs 'setenv bootargs ${bootargs} root=/dev/nfs rw nfsroot=${serverip}:${rootpath}'
BIOS> setenv addipargs 'setenv bootargs ${bootargs} ip=${ipaddr}:${serverip}:${gatewayip}:${netmask}:${hostname}::off'
BIOS> setenv bootcmd 'if ping ${serverip}; then \
  echo; \
  echo Boot over NFS; \
  echo; \
  run nfsboot; \
 else \
  echo; \
  echo Boot from the board;  \
  run jffsboot; \
 fi'
BIOS> setenv board_name apf27
BIOS> setenv netmask 255.255.255.0
BIOS> setenv serverip 192.168.10.2
BIOS> setenv gatewayip 192.168.10.1
BIOS> setenv ipaddr 192.168.10.10
BIOS> setenv rootpath /path/to/where/you/untar/your/rootfs
BIOS> saveenv
BIOS> boot

Adjust the bootdelay if needed.

Next boot will automatically try to boot over NFS, then fallback on the NAND flash

Warning: If the NFS server is alive, but neither the linux kernel image nor the rootfs are NOT at the expected location: /path/to/where/you/untar/your/rootfs, the boot will hang up, so booting will fail !

NFS server configuration

Refer to the NFS wiki page to setting the NFS server up.

Note: Check that the NFS server configuration allows NFS v2 request. On Archlinux: /etc/conf.d/nfs-server (see https://wiki.archlinux.org/index.php/NFS#Configure_NFS_fixed_ports) #MOUNTD_OPTS="--no-nfs-version 2" MOUNTD_OPTS=""

Then:

• untar the rootfs tarball in /path/to/where/you/untar/your/rootfs
• copy the linux kernel image to /path/to/where/you/untar/your/rootfs

sudo tar xvf apf27-rootfs.tar -C /path/to/where/you/untar/your/rootfs
sudo -fv cp apf27-linux.bin /path/to/where/you/untar/your/rootfs