memo.txt

scp transmission
$scp id@address:srcdir/file destdir
$scp  srcdir/file id@address:destdir

clone specific branch
$git clone -b <branch> <remote_repo> --depth 1

-------------------------------------------------------

rpi firmware update
$rpi-update
$apt-get update
$apt-get upgrade
$reboot

rpi configs
$modprobe configs
/proc/config.gz
$ls /lib/modules

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getting crosscompiler
$apt-get install gcc-arm-linux-gnueabi make ncurses-dev

getting kernel source
$...(appropriate version of kernelsource)

copying rpiconfig to kernelconfig
$cd kernelsource
$cp rpiconfigdir/config .config 

check version in 'Makefile'

check '.config'
$cat .config | grep CONFIG_LOCALVERSION_AUTO=n

building kernel to make modules 
$make ARCH=arm CROSS_COMPILE=arm-linux-gnueabi- oldconfig 
$make ARCH=arm CROSS_COMPILE=arm-linux-gnueabi- menuconfig
$make ARCH=arm CROSS_COMPILE=arm-linux-gnueabi- modules_prepare

download appropriate version of 'Module.symvers'
$wget https://github.com/raspberrypi/firmware/raw/master/extra/Module.symvers

---------------------------------------------------------

insert module
$insmod

detach module
$rmmod

check version of module
$modinfo

show printk msg
$dmesg