scripts/runqemu.README: Clean this up to accurately reflect what the runqemu command now does
(From OE-Core rev: 01ec9f0886cf106c5df3bba31de29319d7399e41) Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
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Richard Purdie
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Poky images with QEMU
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=====================
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Using OE images with QEMU
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=========================
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Poky can generate qemu bootable kernels and images with can be used
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on a desktop system. Both arm and x86 images can currently be booted.
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There are two scripts, runqemu and runqemu, one for use within poky,
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the other externally.
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QEMU outside Poky (runqemu)
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=============================
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OE-Core can generate qemu bootable kernels and images with can be used
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on a desktop system. The scripts currently support booting ARM, MIPS, PowerPC
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and x86 (32 and 64 bit) images. The scripts can be used within the OE build
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system or externaly.
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The runqemu script is run as:
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MACHINE=<machine> runqemu <zimage> <filesystem>
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runqemu <machine> <zimage> <filesystem>
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where:
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<machine> is the machine/architecture to use (qemuarm/qemumips/qemuppc/qemux86/qemux86-64)
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<zimage> is the path to a kernel (e.g. zimage-qemuarm.bin)
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<filesystem> is the path to an ext2 image (e.g. filesystem-qemuarm.ext2)
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<machine> is "qemuarm" or "qemux86"
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<filesystem> is the path to an ext2 image (e.g. filesystem-qemuarm.ext2) or an nfs directory
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The MACHINE=<machine> prefix is optional and without it the script will try
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to detect the machine name from the name of the <zimage> file.
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If <machine> isn't specified, the script will try to detect the machine name
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from the name of the <zimage> file.
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If <filesystem> isn't specified, nfs booting will be assumed.
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When used within the build system, it will default to qemuarm, ext2 and the last kernel and
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core-image-sato-sdk image built by the build system. If an sdk image isn't present it will look
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for sato and minimal images.
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QEMU within Poky (runqemu)
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==========================
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The runqemu script is run as:
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runqemu <target> <type> <zimage> <filesystem>
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where:
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<target> is "qemuarm","qemux86","nokia800","spitz" or "akita"
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<type> is "ext2", "nfs", "ext3" or "jffs2". (not all machines support all options)
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<zimage> is the path to a kernel (e.g. zimage-qemuarm.bin)
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<filesystem> is the path to the image (e.g. filesystem-qemuarm.ext2)
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It will default to the qemuarm, ext2 and the last kernel and core-image-sdk
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image built by poky.
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Full usage instructions can be seen by running the command with no options specified.
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Notes
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=====
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- The scripts run qemu using sudo. Change perms on /dev/net/tun to
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run as non root
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run as non root. The runqemu-gen-tapdevs script can also be used by
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root to prepopulate the appropriate network devices.
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- You can access the host computer at 192.168.7.1 within the image.
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- Your qemu system will be accessible as 192.16.7.2.
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- The default NFS mount points are /srv/nfs/qemux86 or /srv/nfs/qemuarm
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depending on the target type.
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- Images built for qemux86/qemuarm contain NFS server which export whole
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rootfs (/) in read/write mode.
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- You can set QEMU_MEMORY to control amount of available memory (default 64M).
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- You can set SERIAL_LOGFILE to have the serial output from the image logged
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to a file.
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- The script extracts the root filesystem specified under pseudo and sets up a userspace
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NFS server to share the image over by default meaning the filesystem can be accessed by
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both the host and guest systems.
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NFS Image Notes
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===============
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As root;
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% apt-get install nfs-kernel-server
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% mkdir /srv/nfs/qemuarm
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Edit via /etc/exports :
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# /etc/exports: the access control list for filesystems which may be exported
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# to NFS clients. See exports(5).
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/srv/nfs/qemuarm 192.168.7.2(rw,no_root_squash)
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% /etc/init.d/nfs-kernel-server restart
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% modprobe tun
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untar build/tmp/deploy/images/<built image>.rootfs.tar.bz2 into /srv/nfs/qemuarm
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Finally, launch:
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% runqemu <target> nfs
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(Substitute qemux86 for qemuarm when using qemux86)
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Copyright (C) 2006-2008 OpenedHand Ltd.
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