妮仔的學習筆記

2010年7月18日星期日

echo 7 > proc/sys/kernel/printk

linux and android power management information

@ Normal Linux suspend - Source code : kernel_src/kernel/main.c kernel_src/kernel/arch/arm/mach-xxx/pm.c - usersp...
Android 3G
Turn off wifi power off script

while [ 1 ] do iwconfig > /data/powersave.log cat /data/powersave.log | grep mlan0 if [ $? -ne 0 ] ; then echo "mlan0 not exist...
beagleboard format mmc card

step1: umount disk #umount /media/disk step2: list disk and delete disk format #fdisk -l /dev/mmcblk0 #fdisk /dev/mmcblk0 step3: partition d...
view code by ctags

Exuberant Ctags Installing :apt-get install exuberant-ctags @setup taglist Edit: /etc/vim/vimrc "Tglist edit set tags=tags; set autochd...
i2c command on uboot

#iprobe : probe to discover i2c chip address #ibus [idx] [spd] : testing i2c bus speed ex: ibus 0 64 64(ST),0x190(FS),0...
S_IRUSR/S_IWUSR/S_IRGRP/S_IWGRP

S_IRUSR Permits the file's owner to read it. S_IWUSR Permits the file's owner to write to it. S_IRGRP Permits the file's g...
linux script :Using while loop

http://www.cyberciti.biz/faq/bash-while-loop/ bash while loop syntax while [ condition ] do command1 command2 command3 done ==============...
Can't rmmod driver on Android

mkdir -p /lib/modules cd /lib/modules ln -s /system/lib/modules `uname -r`
*audio driver on linux

Reference Essential Linux device drives 1. Audio connection cpu ===> audio codec ===> MIC or speaker ex: audio codec : AC97. TI TPS659...

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