Setting up ZyXEL NWD2105 for CentOS-5 and Ubuntu (10.04)

driver info page: http://www.wikidevi.com/wiki/ZyXEL_NWD2105

driver installation guide: http://eimer.ch/nwd2105.html 

$ cd 2011_0107_RT3070_RT3370_Linux_STA_v2.5.0.1_DPO/

$ make; make install

$ edit /etc/Wireless/RT2870STA/RT2870STA.dat for
    SSID=_YOUR_AP's_SSID_
    NetworkType=Infra   
    WirelessMode=5
    Channel=0
    AuthMode=OPEN
    EncrypType=WEP
    DefaultKeyID=1
    Key1Type=1    # (for ASCII key)
    Key1Str=_YOUR_ASCII_PASSWORD_
$ refer to README_STA_usb for further parameter details

For CentOS-5:

$ edit /etc/modprobe.conf; append "alias ra0 rt3070sta" to it.
$ edit /etc/sysconfig/network-scripts/ifcfg-ra0:
   DEVICE='ra0'
   ONBOOT='yes'
   BOOTPROTO='dhcp'
$ edit /etc/sysconfig/network-scripts/ifup-wireless
   comment out the following two lines:
       line-65: iwconfig $DEVICE key off
       line-98: iwconfig $DEVICE essid any >/dev/null 2>&1

$ /sbin/reboot # to check if the wireless is working after reboot

For Ubuntu (10.04):

* edit /etc/modprobe.d/wireless.conf; add "alias ra0 rt3070sta" to it.
* edit /etc/network/interface:
        auto lo
        iface lo inet loopback
        auto wlan0
        iface wlan0 inet dhcp
* /etc/init.d/networking restart
* /sbin/reboot # to check if the wireless is working after reboot

 

負整數 - 正整數 = 正整數？

「負整數 - 正整數 = 正整數」在數學上是不正確的，但在計算機上是可能的，詳細原因可以從布林代數的整數加減法的推算得到解答，這裡列舉一個可能的情形：

• a, b, c 均是 32-bit 的整數 (signed integer)  
• a = 2147483647
• b = -2147483648
• c = b - a = 1
• 十進位表示：
  c(1) = b(-2147483648) - a(2147483647)
• 十六進位表示：
  c(0x00000001) = b(0x80000000) - a(0x7FFFFFFF)

以下是對映的 C 程式：

void main(void)
{
    int32_t a;
    int32_t b;
    int32_t c;

    a = 0x7FFFFFFF;
    printf ("a(%d)\n", a);
    b = a+1;
    printf ("b(%d)\n", b);
    c = b - a;
    printf ("c(%d) = b(%d) - a(%d)\n", c, b, a);
    printf ("c(0x%08X) = b(0x%08X) - a(0x%08X)\n", c, b, a);
}

Ubuntu 10.04 LTS for DELL Vostro 3350

I got my newly arrived Dell vostro 3350 on Jun 29, 2011. I love its anti-glare LCD screen as well as the back-lit keyboard. It was smooth to install Ubuntu 10.04 LTS on it. Everything works after rebooting, except that the LCD resolution was incorrect; also, the Wireless LAN was not working.

Here are my workaround to have them work correctly:

VGA:

• Install backport-maverick kernel for LCD resolution detection (1366x768)
  sudo apt-get install linux-image-generic-pae-lts-backport-maverick \
  linux-headers-generic-pae-lts-backport-maverick
• Reboot
  

Wireless LAN:

• Build the compat-wireless device driver manually for backport-maverick kernel
• Here's the Building and Installing steps
  cd compat-wireless-`date -I`; make; sudo make install
  
• Reboot
  

Approaches to Trim OR1200

OR1200 Module Level Utilization:
1954 Slices, initial slice utilization for or1200_top


After removing CUST5 instruction from or1200_alu:
1873 slices, (1954-1873)/1873 = 4.32% area improvement.


After modifying "SHIFT and ROTATE" logic of or1200_alu:
1839 slices, (1954-1839)/1839 = 6.25% area improvement

Customize minsoc as an OpenRISC sub-system

GOAL
To create a SoC sub-system based on minsoc and OpenRISC

STEPS

1. obtain minsoc and OpenRISC from SVN repository
   

   $ (origin) svn co http://opencores.org/ocsvn/minsoc/minsoc/trunk minsoc
   $ (subsoc) git clone git://github.com/artek/minsoc.git minsoc
   $ svn co http://opencores.org/ocsvn/openrisc/openrisc/trunk openrisc
   

2. follow steps for "GNU tool chain with newlib"
   
   1. build and install or1ksim
      

      edit /etc/ld.so.conf.d/or32.conf, and add /opt/or1ksim/lib

   2. install required library (MFP, MPFR) for building toolchain
      

      $ sudo apt-get install libgmp3-dev libmpfr-dev dejagnu expectk

   3. build toolchain with newlib
      

      $ cd openrisc/gnu-src
      $ sudo ./bld.sh --prefix /opt/or32-elf-new --or1ksim /opt/or1ksim --force
      

   4. add or32-gcc and or1ksim binary to $PATH
      

      export PATH=${PATH}:/opt/or32-elf/bin:/opt/or1ksim/bin

3. refer to "Howto: Porting Newlib" to bring up your own BSP
   
   • config new target as "NON-REENTRANT", "NOT NAMESPACE CLEAN" to reduce generated code size
   • config new target with "-DSMALL_MEMORY" to reduce page size from 4KB to 128B for malloc
   • edit configure.host:
     

     or32-*-*)
     # syscall_dir=syscalls
     newlib_cflags="${newlib_cflags} -DMISSING_SYSCALL_NAMES -DSMALL_MEMORY"
     ;;

   • 
     
4. follow the minsoc-HOWTO for simulation
   evince minsoc/doc/howto.pdf
5. FPGA Impmentation
   
   1. add minsoc_sub to your toplevel
   2. update "Verilog Include Directories" for minsoc to Synthesis options of ISE
      

      ../../rtl/minsoc/rtl/verilog/ (for minsoc)
      |../../rtl/minsoc/rtl/verilog/or1200/rtl/verilog/ (for or1200)
      |../../rtl/minsoc/rtl/verilog/uart16550/rtl/verilog/ (for uart16550)

1. check out openrisc repository from opencores
   svn co http://opencores.org/ocsvn/openrisc/openrisc/trunk openrisc
2. build up toolchain
   cd toolchain_install_scripts/
   
   1. sudo ./crossbuild.sh
      build or32 toolchain and install it to /usr/local/
   2. sh MOF_ORSOC_TCHN_v5c_or32-elf.sh
      build toolchain and or1ksim to specified path
3. 
   

CONS

• or32 ld does not support --gc-sections
  

[all variants] Comprehensive Multimedia & Video Howto - Ubuntu Forums

[all variants] Comprehensive Multimedia & Video Howto - Ubuntu Forums

tips

tips

= unison (bi-directional synchronization)
    -testServer
    $ unison -sshargs -axC teal ssh://joulee.dyndns.org/proj/teal

= rsync (uni-directional synchronization)
    rsync -e 'ssh -ax' -avz ./teal joulee.dyndns.org:proj/teal

= LVM:

• pvdisplay - display attributes of a physical volume
• lvdisplay - display attributes of a logical volume

= LVM: Moving a volume group to another system

• pvscan
• vgexport vg_backup
• vgimport vg_backup
• vgchange -ay vg_backup
• mount /dev/vg_backup/LogVol00 /mnt/backup

= LVM: add a disk partition to current system

• initializing disk partition
  $ pvcreate /dev/sda2
• adding physical volume to an existing
  volume group
  $ lvdisplay
  $ lvextend -l +100%FREE /dev/vg_system/eda_tools
  $ umount /dev/vg_system/eda_tools
  $ e2fsck -f /dev/vg_system/eda_tools
  $ resize2fs /dev/vg_system/eda_tools
  $ mount /tools
  

= octave, rlab: replacement of matlab

= gnuplot
    * gnuplot -persist <script>: keep x11 window after exec <script>
    * x11 plot window
        - help: move to x11 plot window; press 'h'
        - u: unzoom
        - p: previous zoom region
        - right-mouse-button: select zoom region
        - e:

= ssh: Warning: No xauth data; using fake authentication data for X11 forwarding
    details are here ; to fix this problem, run the following command on the local host:
    $ xauth add `echo "${DISPLAY}" | sed 's/.*\(:.*\)/\1/'` . `mcookie`

= Cygwin/X and ssh ForwardX11
    - copy ssh_config to ~/.ssh/config; and set ForwardX11 as yes
    - Or, ssh -Y <remote_host>

= Cygwin/X: Clean way to auto-read ~/.Xresources
    add the following to startxwin.bat:
        %RUN% xrdb -wait -merge ~/.Xresources

=Ten Steps To Higher Cygwin Productivity
    $ updatedb --localpaths='c:/ d:/'
    $ crontab ...
    $ ssh daemon ...

= ssh per-host configuration: specify to login as "ethan" for Host "pc*"
    - ~/.ssh/config:
            Host      pc*
            User      ethan

= keychain
    IBM article OpenSSH key management, Part 1
    - generate ssh key pairs (id_dsa)
    $ ssh-keygen.exe -t dsa
    - copy public DSA key to remote host
    $ scp .ssh/id_dsa.pub ethan@pc2005:
    - login to remote host and concatenate id_dsa.pub to .ssh/authorized_keys
    $ cat id_dsa.pub >> .ssh/authorized_keys
    - edit .bash_profile; add the following to it
        keychain ~/.ssh/id_dsa
        source ~/.keychain/`uname -n`-sh

= emacs
    - indent region: C-M-\
    - mark region: M-< C-SPC M-> C-M-\

= vim
    - include-search /  definition-search [I, ]I, [i, ]i
        :checkpath
        :set path+=../inc
        :set path+=/usr/include/*
    - TODO: apply auto command for "set path"

= cscope
    - cscope -Rb
    - vim: ctrl \ s




= C: Bit Operators (Programming in C:  A Tutorial)

C has several operators for logical bit-operations.
For example,

x = x & 0177;

forms the bit-wise AND of x and 0177, effectively
retaining only the
last seven bits of x.  Other operators are

| inclusive OR
^ (circumflex) exclusive OR
~ (tilde) 1's complement
! logical NOT
<< left shift (as in x<<2)
>> right shift

= bzr
    Bazaar for CVS Users   
    - bzr pull
    - bzr revert
    - bzr update
    - bzr missing

    Using Launchpad and Bazaar

    Using Launchpad and Bazaar

  bzr init-repo libmodbus
  cd libmodbus
  bzr branch lp:libmodbus/trunk
  bzr branch trunk mou
  cd mou
  (hack, hack, hack)
  bzr commit -m "..."
  cd ../trunk
  bzr pull
  cd ../mou
  bzr status
  bzr info
  bzr merge
  (resolve any conflicts)
  bzr commit -m "initial modbus_over_usb"
  bzr push lp:~yishin-li/libmodbus/mou

   

= svn
    - setup subversion on CentOS
    - Note for SELinux / Fedora Core 3+ / Red Hat Enterprise users:
        $ chcon -R -h -t httpd_sys_content_t PATH_TO_REPOSITORY
    - consult docs and faqs from svn site
    - CVS to SVN Crossover Guide
    - Choosing a Repository Layout        . repo/
            projA/
                branches/
                tags/
                trunk/
            projB/                branches/

                tags/

                trunk/
    $ create Repository Layout;
    $ cd repo; svn import . file:///wrk/svn/ssd/repos (import empty layout dirs only)    $ svn import teal/ file:///wrk/svn/ssd/repos/teal/trunk --message "initial teal import"
    $ svn import csim/ file:///wrk/svn/ssd/repos/csim/trunk --message "initial csim import"
    $ svn co file:///wrk/svn/ssd/repos/teal/trunk teal
    $ svn co file:///wrk/svn/ssd/repos/csim/trunk csim
    - how to patch [1 ] [2]
  
    $ sudo svn import proto/ file:///home/svn/repos/proto/trunk --message "initial proto import"
    $ svn co http://taipei/repos/proto/trunk proto

= x264 related (TODO)
x264.exe -b 1 --qp 10 -B 1000 -o output.h264 foreman_part_qcif.yuv 176x144
mplayer.exe -vo yuv4mpeg -vf dect -nosound dolby-city.vob
x264 -o output.h264 stream.y4m --frames 200 --crf 24 -b3 -m9 -r3 --me tesa -8 -t1 --mixed-refs --progress
gprof path-to-x264.exe gmon.out > x264.profile
the most critical part is Motion Estimation (~50%)

what are you trying to do ? output a raw video file ?

ffmpeg -i input -f rawvideo -vcodec rawvideo output

or -f yuv4mpegpipe -vcodec rawvideo (or -f rawvideo -vcodec yuv4mpegpipe ?)

= change login shell: ypchsh
    3  cp ~ethan/.bash_profile .
    4  cp ~ethan/.bashrc .
    5  cp ~ethan/.sh_alias .
    6  cp ~ethan/.profile .
   15  cp ~ethan/bin/* .
   23  cp ~ethan/.eda_tools .
   77  cp -a ~ethan/.vim .
   78  cp -a ~ethan/.vimrc .
   79  cp -a ~ethan/.gvimrc .

= dnsmasq: a light weight tool for DHCP and DNS

= gdbtui
    + CTRL-L to refresh/redraw the screen

= hime (中文輸入法), ubuntu 12.04
    sudo apt-get install hime
    gsettings set com.canonical.Unity.Panel systray-whitelist "['all']"
    sudo glib-compile-schemas /usr/share/glib-2.0/schemas
    sudo cp noseeing.gtab /usr/share/hime/table/

= gcin, ubuntu 10.04
    + im-switch -s gcin
    + noseeing: /usr/share/gcin/script/noseeing-inst (install boshimi)
    + 系統->偏好設定->gcin 輸入法設定->Default input method and toggle key->勾選 Remote client support (port 9999-) (解決 gcin 被 GDM 預先啟動的問題)

= wagig, ubuntu
    sudo apt-get install wajig
    installr Install package and associated recommended packages
    installrs Install package and recommended and suggested packages
    installs Install package and associated suggested packages
       sudo wajig installrs mozilla-thunderbird
       (replace wajig with apt-get)
       http://ubuntuforums.org/showthread.php?t=43382

= update-rc.d, ubuntu
    - update-rc.d cadence defaults 99
    - How-To: Managing services with update-rc.d

= how to create torrent file
    - maketorrent: http://www.dessent.net/btfaq/#maketorrent
    - tracker list: http://torrentfreak.com/how-to-create-a-torrent/
    - example:
        maketorrent-console http://open.tracker.thepiratebay.org/announce <file/dir>

= dpkg-query -S (Find the package a file is from)

= Setting up VMWare shared folders on Ubuntu guest (for both 12.04 and 10.04)