Allen's memo

Cursor 試用心得

2023-03-27T12:40:00.002+08:00

利用時間試用了一下 Cursor(https://www.cursor.so/)，使用的是最近開發BLE專案用到的開源代碼 pc-ble-driver-py (https://github.com/NordicSemiconductor/pc-ble-driver-py)

pc-ble-driver-py主要是拿來 nrf Connect for Desktop 做不到的功能，開發客製DFU升級工具程式。

心得：

測試一: prompt: provide the caller & callee relation chart

感覺是有產生出物件的說明

The code does not include a caller and callee relation chart. However, we can infer the relationship between the various classes and objects based on their usage in the code. The BSCollector class is the main class that manages the BLE driver and adapter, and is responsible for calling methods on the other classes and objects as needed. The BLEDriverObserver and BLEAdapterObserver classes are used to observe events from the BLE driver and adapter, respectively, and are called by the BSCollector class. The `BLEGapScanParams`, `BLEGapSecParams`, `BLEGapSecKDist`, and BLEUUID classes are used to define various parameters for the BLE connection, and are used by the BSCollector class when scanning for devices and connecting to them. The EvtSync class is used to synchronize events between the BLE driver and adapter, and is used by the BSCollector class to wait for events from the device. Finally, the Queue class is used to manage a queue of connections to the device, and is used by the BSCollector class to store connections to the device.

測試二:

prompt: if i need to add disconnect handle, how to do it?

第一感覺被嚇到，這麼聰明嗎? 但，搜尋了一下代碼，發現這是原本就有的參考範例。

測試三:

試著用 Attempt Change 套用到我的測試代碼裡，發現就給些很無用的建議了

感想：

從無到有的生成，其實已經相對成熟。但如果要在已經既有的代碼專案裡面，給修改指導，其實還在很初階的階段。

GCP ACE認證資料參考

2022-11-28T10:35:00.003+08:00

GCP ACE認證

https://zhuanlan.zhihu.com/p/478981425

https://liuyuchen777.github.io/2022/02/20/ACE-Prepare-Note/

https://github.com/kibablu/associate-cloud-engineer

https://ravikirans.com/gcp-associate-cloud-engineer-exam-study-guide/

線上課程
https://www.udemy.com/course/google-cloud-certification-associate-cloud-engineer/

https://www.udemy.com/course/google-certified-associate-cloud-engineer-2019-prep-course/

Build openwert in docker

2022-06-23T14:37:00.003+08:00

Build openwert in docker

docker run -itd \

--name lede-build \

-h r6525 \

-p 10022:22 \

-v ~/firefly_openwrt:/home/user/firefly_openwrt \

p3terx/openwrt-build-env:18.04

docker exec -it lede-build zsh

missing apps

sudo apt install repo

sudo apt install bison

sudo apt install bc

sudo apt install liblz4-tool

sudo apt install time

How can I tell Ubuntu to do nothing when I close my laptop lid?

2022-06-07T22:54:00.003+08:00

Ubuntu 21.10

/etc/systemd/logind.conf

    HandleLidSwitch=ignore

    sudo systemctl restart systemd-logind

Ubuntu 20.04

/etc/UPower/UPower.conf

IgnoreLid=true

sudo systemctl restart upower

2022-06-05T08:12:00.004+08:00

HOW TO MOVE DOCKER DATA DIRECTORY TO ANOTHER LOCATION ON UBUNTU

https://www.guguweb.com/2019/02/07/how-to-move-docker-data-directory-to-another-location-on-ubuntu/

2022-04-06T23:32:00.003+08:00

Installing Nextcloud on a Raspberry Pi with docker

I found a good reference on https://github.com/chrisbeardy/nextcloud-docker-raspberrypi-tutorial

Prevent .vmem file created

2018-12-27T10:37:00.002+08:00

VMWare guest on SSD, prevent .vmem files created

prefvmx.minVmMemPct = "100"
MemTrimRate = "0"
mainMem.useNamedFile = "FALSE"
sched.mem.pshare.enable = "FALSE"
prefvmx.useRecommendedLockedMemSize = "TRUE"

CR-7 3DP enlargement & improvment

2015-11-12T09:40:00.001+08:00

The note for CR-7 modification.

https://www.facebook.com/groups/CR7.3Dprinter/permalink/1694600304104248/

https://www.facebook.com/groups/CR7.3Dprinter/permalink/1707951899435755/

https://www.facebook.com/groups/CR7.3Dprinter/permalink/1712531022311176/

1. Base
acrylic 6mm
Y axis M4 x 4, X axis M4 x 3，Z axis M5 x 3
https://www.facebook.com/groups/CR7.3Dprinter/1713610108869934/

2. Slide plate (4 wheels)
acrylic 6mm
https://www.facebook.com/groups/CR7.3Dprinter/1712531438977801/

3. Printing Base (with 4 magnet)
acrylic 6mm
https://www.facebook.com/groups/CR7.3Dprinter/1712531222311156/

4. 3mm 210x210mm glass (with 4 magnet)

5. V-Slot aluminum extrusion
2040 370mm x 1 (Z axis)
2040 340mm x 1 (Y axis)
2020 295mm x 1 (X axis)
2020 140mm x 1 (X axis)

6. T8-Lead Screw holder
https://www.facebook.com/groups/CR7.3Dprinter/1702000616697550/

7. T8 Lead Screw

8. Beam Coupling (5mm to 8mm)

9. belt 2M

10. PTFE tube (4*2mm) 400mm

11. opto limit for Z asix

12. Slide nut M4 x 13 M5 x 1 (optional)

Savageboard Dual/Solo with BCM43241 in Yocto

2014-07-04T16:23:00.000+08:00

Yocto image for Savageboard Dual/Solo with BCM43241

This image includes:

1. opencv library (for more information: this link is helpful: http://imxcv.blogspot.tw/2014/02/building-opencv-24x-for-freescales-imx6.html )

2. gstermer for fsl

3. opengles demo with 3D acceleration

To test WiFi & BT:

1. WIFI (modify /etc/wpa_supplicant.conf for your WiFi environment. Using wpa_passphrase ssid key to generate the key)

modprobe bcmdhd (insert wifi driver)

ifup wlan0 (bring up wifi & wpa_supplicant, then udhcpc will try to get IP address from WiFi AP)

PS: Please unpluging ethernet cable beforce wifi testing, due to udhcpc may not get DNS setting at ethernet cable plugged.

2. BT

rfkill unblock wimax

brcm_patchram_plus --no2bytes --baudrate 3000000 --use_baudrate_for_download --patchram /etc/wifi/bcm4324.hcd /dev/ttymxc2

hciattach -s 3000000 /dev/ttymxc2 any 3000000 flow

rfkill unblock bluetooth

hciconfig hci0 up

hcitool scan (will show BT devices nearby)

To test OpenCV:

Use the camera_test in http://imxcv.blogspot.tw/2014/02/building-opencv-24x-for-freescales-imx6.html with USB UVC camera.

Ex: DISPLAY=:0 ./camera_test

To test Gstermer:

gst-launch filesrc location=1080p.mp4 typefind=true ! aiurdemux ! queue ! vpudec ! mfw_v4lsink

PS: If getting “gst-launch-0.10: page allocation failure: order:11, mode:0xd1”, please free more system memory by “echo 3 > /proc/sys/vm/drop_caches”

add exist git repo up to github

2013-12-27T15:51:00.002+08:00

Take uboot_savage_mx6 as example.

1. git remote add pb https://github.com/allencyhsu/uboot_savage_mx6.git

2. git remote -v

origin git://git.freescale.com/imx/uboot-imx.git (fetch)

origin git://git.freescale.com/imx/uboot-imx.git (push)

pb https://github.com/allencyhsu/uboot_savage_mx6.git (fetch)

pb https://github.com/allencyhsu/uboot_savage_mx6.git (push)

3. git push pb savage-jb

answer the id & pass question.

4. wait couple minutes to complete upload.

5. go to github to check the code uploaded.

Add a project on exist AOSP repository

2013-09-17T00:31:00.002+08:00

Add a project on exist AOSP repository (ex: realtek android driver)

Make a git repository & add/commit files

cd /hardware/realtek/wlan
  git init
  git add *
  git commit -m "1st release" -a

Create .repo/projects

cd .git
mkdir -p ../../../../.repo/projects/hardware/realtek/wlan.git
cp -a * ../../../../.repo/projects/hardware/realtek/wlan.git/

Remove local git files & make link to .repo/projects

rm -rf branches/ config description hooks/ info/ logs/ objects/ refs/
  ln -s ../../../../.repo/projects/hardware/realtek/wlan.git/branches .
  ln -s ../../../../.repo/projects/hardware/realtek/wlan.git/config .
  ln -s ../../../../.repo/projects/hardware/realtek/wlan.git/description .
  ln -s ../../../../.repo/projects/hardware/realtek/wlan.git/hooks .
  ln -s ../../../../.repo/projects/hardware/realtek/wlan.git/info .
  ln -s ../../../../.repo/projects/hardware/realtek/wlan.git/logs .
  ln -s ../../../../.repo/projects/hardware/realtek/wlan.git/objects .
  ln -s ../../../../.repo/projects/hardware/realtek/wlan.git/refs .

Edit project.list and manifest.xml

vi .repo/project.list
- add
hardware/realtek/wlan
vi .repo/manifest.xml
- add

Ubuntu pptp server

2013-04-15T13:02:00.001+08:00

1. install pptpd service
sudo apt-get install pptpd

2. iptables rules
-A INPUT -i xyz0 -p tcp -m state --state NEW --dport 1723 -j ACCEPT

-A INPUT -i xyz0 -p gre -j ACCEPT
-A OUTPUT -i xyz0 -p gre -j ACCEPT
-A INPUT -i xyz0 -p tcp --sport 1723 -s xxx.xxx.xxx.xxx -j ACCEPT
-A OUTPUT -i xyz0 -p tcp --dport 1723 -d xxx.xxx.xxx.xxx -j ACCEPT

xyz0 is the out interface.
xxx.xxx.xxx.xxx is the pptp server address

3. /etc/pptpd.conf
modify localip & remoteip

localip xxx.xxx.xxx.xxx
remoteip 192.168.x.51-59

xxx.xxx.xxx.xxx is the pptp server address

4. /etc/ppp/chap-secrets

add one entry for pptpd

# client server secret IP addresses

"user" pptpd "password" *

5. start pptpd service

Use tmpfs in Ubuntu to speed up

2013-03-12T15:09:00.001+08:00

Why? Sometime, you will use USB stick to boot up to another testing Ubuntu distribution, but the USB stick as main disk is really slow. So, I choose to use Linux tmpfs to avoid un-necessary access.

/etc/fstab
tmpfs /tmp tmpfs defaults,noatime,mode=1777 0 0

tmpfs /var/spool tmpfs defaults,noatime,mode=1777 0 0
tmpfs /var/tmp tmpfs defaults,noatime,mode=1777 0 0

Install Android JB build environment on Ubuntu precise x64

2013-03-08T17:03:00.001+08:00

Install Oracle JDK :

go to "https://raw.github.com/flexiondotorg/oab-java6/" get oab-java.sh

chmod +x oab-java.sh

sudo ./oab-java.sh

after oab-jave.sh finished.

sudo apt-get install sun-java6-jdk

sudo update-alternatives --config java

choose "java-6-sun"

Install Android build necessary package Ubuntu 12.04 x64:

sudo apt-get install git-core gnupg flex bison gperf build-essential zip curl libc6-dev libncurses5-dev:i386 x11proto-core-dev libx11-dev:i386 libreadline6-dev:i386 libgl1-mesa-glx:i386 libgl1-mesa-dev g++-multilib mingw32 openjdk-6-jdk tofrodos python-markdown libxml2-utils xsltproc zlib1g-dev:i386 uboot-mkimage

sudo ln -s /usr/lib/i386-linux-gnu/mesa/libGL.so.1 /usr/lib/i386-linux-gnu/libGL.so

Pandaboard mldonkey server

2012-10-21T19:30:00.001+08:00

1. the original mldonkey with precise has bug.
https://bugs.launchpad.net/ubuntu/+source/mldonkey/+bug/1060007

2. try to build for my own.
- get mldonkey-3.1.3.tar.bz2 from official site
- extract & get build depend package
apt-get install build-essential checkinstall ocaml-nox ocaml-native-compilers zlib1g-dev
- change CXXFLAGS -O2 to -Os
- ./configure --disable-multinet
- make -j2
- copy ./mlnet to /usr/bin/mlnet (to replace the old one)

3. regarding the password for remote user.
- telnet 127.0.0.1 4000
- useradd admin xxxx (xxxx is password you want)

Ref: https://help.ubuntu.com/community/MLDonkey
http://mldonkey.sourceforge.net/Quickstart_guide
http://mldonkey.sourceforge.net/CompilationProblems

Pandaboard - fix smsc95xx 1-1.1:1.0: eth0: kevent 2 may have been dropped

2012-10-21T12:50:00.003+08:00

1. add smsc95xx.turbo_mode=N in /boot/boot.script

2. /etc/sysctl.conf
- vm.min_free_kbytes = ~~16384~~ 32768
- vm.vfs_cache_pressure = ~~200~~ 300

3. update systcl

- sudo sysctl -p

lsmod result in Ubuntu precise on Pandaboard

2012-10-21T11:38:00.003+08:00

ppp_deflate 4867 0
zlib_deflate 21306 1 ppp_deflate
bsd_comp 5569 0
ppp_async 7602 1
crc_ccitt 1628 1 ppp_async
xt_tcpudp 2573 29
xt_state 1384 1
iptable_filter 1733 1
ipt_MASQUERADE 1954 1
iptable_nat 4528 1
nf_nat 19315 2 ipt_MASQUERADE,iptable_nat
nf_conntrack_ipv4 14233 4 iptable_nat,nf_nat
nf_conntrack 85255 5 xt_state,ipt_MASQUERADE,iptable_nat,nf_nat,nf_conntrack_ipv4
nf_defrag_ipv4 1594 1 nf_conntrack_ipv4
ip_tables 13212 2 iptable_filter,iptable_nat
x_tables 19387 6 xt_tcpudp,xt_state,iptable_filter,ipt_MASQUERADE,iptable_nat,ip_tables
dm_crypt 18016 0
wl12xx 174783 0
mac80211 490889 1 wl12xx
cfg80211 203992 2 wl12xx,mac80211
wl12xx_sdio 3829 0
compat 3663 4 wl12xx,mac80211,cfg80211,wl12xx_sdio
gpio_keys 9031 0
leds_gpio 3788 0

Pandaboard disable ondemand cpu governor

2012-10-21T03:35:00.000+08:00

1. sudo update-rc.d ondemand disable

2. modify rc.local
# By default this script does nothing.
#set scaling_governor to userspace
echo userspace > /sys/devices/system/cpu/cpu0/cpufreq/scaling_governor
echo userspace > /sys/devices/system/cpu/cpu1/cpufreq/scaling_governor
# set cpufreq to 800Mhz
echo 800000 > /sys/devices/system/cpu/cpu0/cpufreq/scaling_setspeed
echo 800000 > /sys/devices/system/cpu/cpu1/cpufreq/scaling_setspeed

Android keylayout support

2012-10-21T02:29:00.000+08:00

1. kernel add gpio key support
2. choose the right .kl & .kcm
it should be the same with the gpio key driver name(ex: gpio-keys.xx)

Openbravo POS note in Lucid (ARMv7)

2012-10-21T02:28:00.000+08:00

RXTX could use the repo's package

but, RXTXComm.jar need to be put in /usr/lib/jvm/java-6-openjdk/jre/lib/ext

librxtxParallel.so, librxtxSerial.so need to be put in /usr/lib/jvm/java-6-openjdk/jre/lib/arm

Use TestSerialPort to do the test.
1. javac *.java
2. java ListCommPorts (check result)

Ubuntu ttySx default only root & dialout have permission to use.
so, the openbravo user need to join dialout group.

for autologon & auto-launch openbravo-pos
/etc/lxdm/lxdm.conf need to be modified
[base]
autologin=opos
session=/opt/openbravopos-2.30/start.sh

Pandaboard Ubuntu 12.04 precise note

2012-10-21T02:16:00.000+08:00

My goal is make an device that be my wireless access point, transmission daemon, mldonkey daemon & samba server in my home.

1. first I take a look the following info as reference.
http://drizztcp.wordpress.com/category/pandaboard/

2. Grab the Ubuntu 12.04 image from http://cdimage.ubuntu.com/releases/12.04/release/. I choose http://cdimage.ubuntu.com/releases/12.04/release/ubuntu-12.04-preinstalled-server-armhf+omap4.img.gz for my Pandaboard A2.

3. Make bootable SDCard & following the install instruction. https://wiki.ubuntu.com/ARM/OmapDesktopInstall

4. Now, I have an bootable Panda.

5. Configuration the hostapd. I don't want just take my panda as AP only. So, I decide to run dhcpd on wlan0.
5.1 dhcp-server part:
5.1.1. apt-get install isc-dhcp-server
5.1.2 modify /etc/default/isc-dhcp-server
- INTERFACES="wlan0"
5.1.3 modify /etc/dhcp/dhcpd.conf
- option domain-name "myhome.net";
- option domain-name-servers 168.95.192.1, 168.95.1.1; (for my Hinet DNS)

- subnet 192.168.0.0 netmask 255.255.255.0 {

range 192.168.0.100 192.168.0.150;

option subnet-mask 255.255.255.0;

option broadcast-address 192.168.0.255;

option routers 192.168.0.254;

}

5.2 hostapd part:

5.2.1 /etc/network/interfaces We need wlan0 has static ip to be the rule of dhcp-server.

- auto wlan0

iface wlan0 inet static

address 192.168.0.254

netmask 255.255.255.0

network 192.168.0.0

broadcast 192.168.0.255

5.2.2 /etc/hostapd/hostapd.conf

- interface=wlan0

driver=nl80211

ssid=panda-wifi

hw_mode=g

ieee80211n=1 # enable 802.11n support.

wmm_enabled=1

#ht_capab=[HT40-][HT40+] #Ti wl1271 only up to 65Mbps. HT40 will cause module hang.

channel=5

macaddr_acl=0

#0 is allow all connection, 1 is deny all connect, only accept in hostspd.accept

accept_mac_file=/etc/hostapd/hostapd.accept

deny_mac_file=/etc/hostapd/hostapd.deny

auth_algs=1

ignore_broadcast_ssid=0

wpa=2

wpa_passphrase=xxxxxx #choose the password you want.

wpa_key_mgmt=WPA-PSK

wpa_pairwise=TKIP

rsn_pairwise=CCMP

5.2.3 touch /etc/hostapd/hostapd.accept & /etc/hostapd/hostapd.deny to let hostapd daemon running.

OK, we have wlan0 & hostapd work now. Next, I want the pppoe work. Zyxel P874 seems performance is not good enough for P2P.

6. PPPoE on eth0

6.1 install ppp, pppoe support

- apt-get install ppp pppconfig pppoe pppoeconf

6.2 /etc/ppp/peers/dsl-provider

- pty "/usr/sbin/pppoe -I eth0 -T 80 -m 1452"

noipdefault

usepeerdns

defaultroute

user "????????@ip.hinet.net"

6.3 /etc/ppp/chap-secrets, /etc/ppp/pap-secrets

- "????????@ip.hinet.net" * "??????"

6.4 /etc/network/interfaces

- add dsl-provider section

auto dsl-provider

iface dsl-provider inet ppp

provider dsl-provider

6.5 PPPoE keepalive.sh (for auto-reconnect)

#!/bin/sh

# keepalive.sh

# This is a keepalive script for the Casema cable modems. This script was

# lifted from the /usr/doc/HOWTO/unmaintained/mini/Dynamic-IP-Hacks

# document. There should be an entry in your crontab looking like:

# */2 * * * * /etc/ppp/keepalive.sh

# to run this script every 2 minutes to see if your connection is still

# up, if not, gracefully kill the pppd process and remake it.

# Modify paths as necessary.

if [ -f /var/run/ppp0.pid ]; then

testing=$(ping -c4 -l4 168.95.192.1 2>&1 | grep "0 packets")

if [ "$testing" != "" ]; then

/usr/bin/poff -a

sleep 10

/usr/bin/pon dsl-provider

else

/usr/bin/pon dsl-provider

6.6 /etc/crontab

- */2 * * * * root /etc/ppp/keepalive.sh (for auto-reconnect)

7. To be an Wireless router

7.1 /etc/sysctl.conf

- enable IPv4 forward

net.ipv4.ip_forward=1

7.2 add iptable rule.

- wlan0 as LAN (192.168.0.xxx/24) , ppp0 as Internet connection

7.2.1 /etc/firewall-rules

*nat

:PREROUTING ACCEPT [0:0]

:POSTROUTING ACCEPT [0:0]

:OUTPUT ACCEPT [0:0]

-A POSTROUTING -s 192.168.0.0/24 -o ppp0 -j MASQUERADE

COMMIT

*filter

:INPUT DROP [0:0]

:FORWARD ACCEPT [0:0]

:OUTPUT ACCEPT [0:0]

-A INPUT -i wlan0 -s 127.0.0.1/8 -j DROP

-A OUTPUT -o wlan0 -d 127.0.0.1/8 -j DROP

-A INPUT -i ppp0 -s 127.0.0.1/8 -j DROP

-A OUTPUT -o ppp0 -d 127.0.0.1/8 -j DROP

-A INPUT -m state --state RELATED,ESTABLISHED -j ACCEPT

-A INPUT -s 127.0.0.0/8 -d 127.0.0.0/8 -i lo -j ACCEPT

-A INPUT -i ppp0 -p tcp -m tcp --dport 22 -j ACCEPT

#for transmission package

-A INPUT -i ppp0 -p tcp -m tcp --dport 9091 -j ACCEPT

-A INPUT -i ppp0 -p tcp -m tcp --dport 51413 -j ACCEPT

#for FTP

-A INPUT -i wlan0 -p tcp -m tcp --dport 20 -j ACCEPT

-A INPUT -i wlan0 -p tcp -m tcp --dport 21 -j ACCEPT

# for SSH

-A INPUT -i wlan0 -p tcp -m tcp --dport 22 -j ACCEPT

#for SMB/CIFS

-A INPUT -i wlan0 -p tcp -m tcp --dport 139 -j ACCEPT

-A INPUT -i wlan0 -p tcp -m tcp --dport 445 -j ACCEPT

#for transmission package

-A INPUT -i wlan0 -p tcp -m tcp --dport 4001 -j ACCEPT

-A INPUT -i wlan0 -p tcp -m tcp --dport 9091 -j ACCEPT

#for SMB/CIFS

-A INPUT -i wlan0 -p udp -m udp --dport 137 -j ACCEPT

-A INPUT -i wlan0 -p udp -m udp --dport 138 -j ACCEPT

#deny hacker scan

-A INPUT -p tcp --tcp-flags ALL NONE -j DROP

-A FORWARD -p tcp --tcp-flags ALL NONE -j DROP

-A INPUT -p tcp --tcp-flags SYN,FIN SYN,FIN -j DROP

-A FORWARD -p tcp --tcp-flags SYN,FIN SYN,FIN -j DROP

-A INPUT -p tcp --tcp-flags SYN,RST SYN,RST -j DROP

-A FORWARD -p tcp --tcp-flags SYN,RST SYN,RST -j DROP

-A INPUT -p tcp --tcp-flags FIN,RST FIN,RST -j DROP

-A FORWARD -p tcp --tcp-flags FIN,RST FIN,RST -j DROP

-A INPUT -p tcp --tcp-flags ACK,FIN FIN -j DROP

-A FORWARD -p tcp --tcp-flags ACK,FIN FIN -j DROP

-A INPUT -p tcp --tcp-flags ACK,URG URG -j DROP

-A FORWARD -p tcp --tcp-flags ACK,URG URG -j DROP

# icmp allow list

-A INPUT -p icmp --icmp-type 0 -j ACCEPT

-A INPUT -p icmp --icmp-type 3 -j ACCEPT

-A INPUT -p icmp --icmp-type 3/4 -j ACCEPT

-A INPUT -p icmp --icmp-type 4 -j ACCEPT

-A INPUT -p icmp --icmp-type 11 -j ACCEPT

-A INPUT -p icmp --icmp-type 12 -j ACCEPT

-A INPUT -p icmp --icmp-type 14 -j ACCEPT

-A INPUT -p icmp --icmp-type 16 -j ACCEPT

-A INPUT -p icmp --icmp-type 18 -j ACCEPT

COMMIT

7.2.2 /etc/network/interfaces

- modify dsl-provider section.

auto dsl-provider

iface dsl-provider inet ppp

pre-up iptables-restore < /etc/firewall-rules

provider dsl-provider

8. install transmission daemon & do basic setting.

BTW, I upgrade the kernel to 3.4.0 (from PPA) & upgrade the tiwlan-wl12xx-dkms, tiwlan-wl12xx-firmware to help wl1271 more stable.

Done...

Upgrade lucid to precise

2012-10-15T12:54:00.000+08:00

1. boot.scr mmc init 2;fatload mmc 2 80200000 uImage;bootm 0x80200000 setenv bootargs console=ttyO2,115200n8 mem=512M@0x80000000 root=/dev/mmcblk0p2 rw rootfstype=ext4 rootwait mpurate=${mpurate} ethaddr=${ethaddr} omapdss.def_disp=dvi omapfb.mode=dvi:800x600MR-16@60 vram=4M --no-log ps: --no-log is workaround for "init: Failed to create pty - disabling logging for job"

2. apt sources.list modify /etc/apt/sources.list, replace lucid to precise

3. do dist-upgrade apt-get dist-upgrade -o APT::Immediate-Configure=false during dist-upgrade, some configuration file will be changed

4. mkdir lib/modules dir mkdir -p /lib/modules/2.6.37-gb0042ce touch /lib/modules/2.6.37-gb0042ce/modules.dep

5. remove old udev net rules rm /etc/udev/rules.d/70-persistent-net.rules

6. do backup tar cvpf gogobox-ubuntu-precise-20121015.tar.gz --exclude=/proc --exclude=/lost+found --exclude=/mnt --exclude=/sys /

OMAPDSS:How to enable DVI display

2011-06-24T16:44:00.000+08:00

How to enable DVI display
DVI display can be enabled in two ways
1. Using bootargs
Eg: omapdss.def_disp="dvi" omapfb.mode=dvi:720x480@60
2. Using SYSFS attributes
echo 0 > /sys/devices/platform/omapdss/display0/enabled
echo "" > /sys/devices/platform/omapdss/manager0/display
fbset -fb /dev/fb0 -xres 720 -yres 480
echo "dvi" > /sys/devices/platform/omapdss/manager0/display
echo 1 > /sys/devices/platform/omapdss/display2/enabled
kill
Restart without enabling rotation: matrix_gui -qws /usr/share/matrix/html/menu_main.html

ref: http://processors.wiki.ti.com/index.php/AM37x_EVM_Software_Developer%27s_Guide

Bash - rename your file name

2011-06-16T00:40:00.001+08:00

for i in *.rmvb; do mv $i `echo $i | cut -d '.' -f 2,3,4,5,6`; done

ex: 远古外星人.Ancient.Aliens.S02E10.HDTV-RMVB.rmvb to Ancient.Aliens.S02E10.HDTV-RMVB.rmvb

Ubuntu Backup/Restore

2011-03-27T01:50:00.001+08:00

reference from: http://ubuntuforums.org/showthread.php?t=81311

1. Gen the Tar file:
tar cvpf sendai-backup.tar --exclude=/proc --exclude=/lost+found --exclude=/sendai-backup.tar --exclude=/mnt --exclude=/sys /

2. Restore the tar to target
tar xvpf sendai-backup.tar -C /

3. mkdir the exclude dir
mkdir proc
mkdir lost+found
mkdir mnt
mkdir sys