Improve the qemu scripts and documentation (qemux86 support isn't complete yet)

git-svn-id: https://svn.o-hand.com/repos/poky/trunk@867 311d38ba-8fff-0310-9ca6-ca027cbcb966

scripts/runqemu.README

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+Using qemu with poky notes
+==========================
+
+Poky can generate qemu bootable kernels and images with can be used 
+on a desktop system. Both arm and x86 images can currently be booted. 
+The runqemu script is run as: 
+
+   runqemu <target> <type> <zimage> <filesystem>
+
+where:
+
+   <target> is "qemuarm" or "qemux86"
+   <type> is "ext2" or "nfs"
+   <zimage> is the path to a kernel (zimage-qemuarm.bin)
+   <filesystem> is the path to an ext2 image (filesystem-qemuarm.ext2)
+
+It will default to the qemuarm, ext2 and the last kernel and oh-image-pda 
+image built by poky.
+
+NFS Image Notes
+===============
+
+As root;
+
+% apt-get install nfs-kernel-server
+
+% mkdir /srv/qemuarm
+
+Edit via /etc/exports :
+
+# /etc/exports: the access control list for filesystems which may be exported
+#               to NFS clients.  See exports(5).
+/srv/qemuarm 192.168.7.2(rw,no_root_squash)
+
+% /etc/init.d/nfs-kernel-server restart
+
+% modprobe tun
+
+untar build/tmp/deploy/images/<built image>.rootfs.tar.bz2 into /srv/qemuarm
+
+Finally, launch:
+
+% runqemu <target> nfs
+
+Notes
+=====
+
+ - The runqemu script runs qemu with sudo. Change perms on /dev/net/tun to 
+   run as non root
+ - You can set QEMU_MEMORY env var to control amount of available memory
+   ( defaults to 64M )
+ - There is a bug in qemu in that means occasionally it will use 100% cpu.
+   You will need to restart it in this situation.
+
+More Info
+=========
+
+ - See http://o-hand.com/~richard/qemu.html
+