I can confirm that adding rw at the front of cmdline.txt has overcome the read-only issue. However, I have a static IP (using ethernet) which has now not working and I am not too sure how to get it back. I have tried disabling dhcpcd@eth0 and issing a netctl start and enable (I have checked my /etc/netctl/eth0 config file). However, this has not worked. I have also noticed that my UK keyboard setting have also been wiped out.
This is so frustrating as my PI is headless and thanks to an update I have to drag a monitor and keyboard about
Any idea's of what is causing the lack of network / how to get it back?
On a side note, I did read one of the update message that said the cmdline.txt will have a new version called cmdline.txt.pacnew. In my attempts to fix this issue, I copied the .pacnew to the cmdline.txt, but the PI would not boot!
--------------------------------------
As my new problem is nothing to do with the orginal subject, I have started a new tread (
http://archlinuxarm.org/forum/viewtopic.php?f=31&t=8328) and marked this one as solved.