VIM 修改 ^M 換行的指令

在windows版本的gvim/vim底下
:% s/\r//g

在linux based的vim底下
:% s/^M//g

其中^M 的输入用 Ctrl+v, Ctrl+m。

會有這樣的不同是因為Ctrl+v在windows是貼上@@

cross compile ssh daemon(dropbear) for arm

1. Get zlib(included by dropbear)
#wget http://www.zlib.net/zlib-1.2.3.tar.gz
#tar zxvf zlib-1.2.3.tar.gz
#mkdir zlib
#cd zlib-1.2.3/
#CC=arm-none-linux-gnueabi-gcc ./configure --prefix=/zlib
#make
#make install

2. Get dropbear source
#wget http://matt.ucc.asn.au/dropbear/releases/dropbear-0.51.tar.gz
#tar zxvf dropbear-0.51.tar.gz
#mkdir dropbear-build
#cd dropbear-build/
#mkdir build
#../dropbear-0.51/configure --prefix=/build/ \
--with-zlib=/zlib/ CC=arm-none-linux-gnueabi-gcc --host=arm-none-linux-gnueabi LDFLAGS=-static
#make
#sudo make install

3. Copy dbclient, dropbearconvert, dropbearkey, and dropbear binarys to your file system and generate the cpio.gz file(Under build/bin and build/sbin, if you are not using a emulator, do not generate cpio.gz file :))

4. In target,
#cd /etc
#mkdir dropbear
#cd dropbear
#dropbearkey -t rsa -f dropbear_rsa_host_key

if indicate "Exited: couldn't open random device", do the following
#mknod -m=666 /dev/random c 1 8
#mknod -m=666 /dev/urandom c 1 9

#dropbear(assume the binary is under /sbin)

5. Done, you should be able to run ssh client to access this machine.
(May add password if it's originally none, otherwise ssh will complain permission denied)

PS. If you encountered the following error when ssh to the target.
"PTY allocation request failed on channel 0"
"shell request failed on channel 0"
do the following:

# mkdir /dev/pts
# mknod /dev/ptmx c 5 2
# mount -t devpts devpts /dev/pts

Cross Compile gdb for x86 and gdbserver for ARM

1. Download GDB source code
2. Download toolchain. ex, you can download the toolchain binary from codesourcery.
3. you will have GDB for x86 host machine after the following:
#./configure --target=arm-none-linux-gnueabi LDFLAGS=-static --with-build-libsubdir=/usr/local/arm-2008q3/arm-none-linux-gnueabi/libc/usr/lib --disable-werror
#make
4. enter gdb/gdbserver, you will have gdbserver for ARM after the following:
#./configure --host=arm-none-linux-gnueabi --target=arm-none-linux-gnueabi LDFLAGS=-static --with-build-libsubdir=/usr/local/arm-2008q3/arm-none-linux-gnueabi/libc/usr/lib --disable-werror
#make

ps.
If make complains about no termcap library, do the following
1. Download ncurses (search the web)
2. Do the following
#./configure --host=arm-none-linux-gnueabi --target=arm-none-linux-gnueabi --prefix="$HOME/install"
#make && make install
#sudo cp ~/install/lib/libncurses.a /usr/local/arm-2008q3/arm-none-linux-gnueabi/libc/usr/lib
#sudo cp ~/install/include/ncurses/ /usr/local/arm-2008q3/arm-none-linux-gnueabi/libc/usr/include -rf

Beaware that this is because that the toolchain is not aware of the libncurses.a library though you've probably install it in the regular path. We need it for the toolchain and which is for ARM machine.
You can do
#file libncurses.a
to check if it's for your machine or for the target. The format should match to cease the complaining.