[oe] arm kexec commandline support

[Thomas Kunze]

Hi all,

I have written a quick hack to support custom commandlines for arm with 
kexec. You need:

http://www2.informatik.hu-berlin.de/~tkunze/zaurus/patches/kexec_commandline-3.patch

and:

http://www2.informatik.hu-berlin.de/~tkunze/zaurus/patches/atag_support.patch

(from lak)


How to use:
Use kexec as usual. To change the commandline do:
echo "your commandline" > /sys/kernel/kexec_cmdline

This sets up a ataglist in memory which is copied to 0xc0000100 when 
machine is rebooted.
This address is given the new kernel as ataglist in r2.

This works on collie, but should work on any arm machine. I didn't find 
out why I can't give an arbitrary address to the new kernel in r2 but it 
doesn't work (machine hangs.)

Comments are welcome.

Thomas