linuxmce@dcerouter:~$ gksudo echo 'ide=nodma' >/proc/cmdline
-bash: /proc/cmdline: Permission denied
Bear with me as I am not too fluent in Linux...
Sorry for the delayed response.. didn't check my email over the weekend..
You can't echo anything to /proc/cmdline as that is read only. When kernel was booting up it puts all the entries here for reference by rest of the programs/software/services in case they want to know what were the options it started..
Will read the rest of the thread and see where you are at..