First of all I'm not the owner of this toolchain, so my description could be wrong.(don't blame me plz)

1. Downloading toolchain
You can download expecting toolchain from following URL:
http://www.mikrocontroller.net/articles/ARM_GCC_toolchain_for_Linux_and_Mac_OS_X

For me, I picked up "uild 2 - Mac OS X Intel (32 MB) (compiled by Darrik Spaude)" this one.
(Because I'm Intel mac user. MBP and MBA)

2. Install procedure
No need to install it :)
just untar (unbz2 also) the archive like this.

tar xjvf arm-toolchain-macosx-intel-2.tar.bz2



After that you can get your "arm" directory



For me, I moved that to root directory. I mean at the top of filesystem.



Then we have /arm directory.



3. Get included in your path.

you can use arm gcc just typing arm-....gcc if you include your toolchain directory path 

in your $PATH environment variable.

Let's assume that you are using bash.

Repeat as following.



vi ~/.bash_profile



and add following line at the terminal of the file.



export PATH=/arm/bin:$PATH



After that you can use your ARM toolchain without typing full path at every path of your terminal.





Enjoy your dev life :)

P.S) I haven't tested on target board whether it is working or not. 

I've gotta no arm target board at home ;(

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