[CentOS] install CentOS 6 from minimal, console only

Hi all

I would like to install CentOS on this:
http://www.lannerinc.com/x86_Network_Appliances/FW-7520
- No VGA/DVI
- Only a "console" port (the old 9600 baudrate one)
- Boot on USB actived by default
Would you know a tutorial helping on installing CentOS on this?

I guess I have to
- download the minimal iso,
- 'dd'-copy it to a flash USB drive
- setup some files to use the console instead of vga (which ones...?)

My desktopo side, I already have minicom et al installed, just looking for.

-- 
RMA.